35B-1 GROUP 35B ANTI-SKID BRAKING SYSTEM (ABS) CONTENTS SERVICE SPECIFICATIONS. . . . . . . 35B-3 SPECIAL TOOLS. . . . . . . . . . . . . . . . 35B-3 TROUBLESHOOTING . . . . . . . . . . . . 35B-5 DIAGNOSIS TROUBLESHOOTING FLOW 35B-5 NOTES WITH REGARD TO DIAGNOSIS . 35B-5 ABS WARNING LAMP AND BRAKE WARNING LAMP CHECK . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35B-5 DIAGNOSTIC FUNCTION . . . . . . . . . . . . . 35B-6 DIAGNOSIS CODE CHART . . . . . . . . . . . . 35B-11 DIAGNOSIS CODE PROCEDURES . . . . . 35B-12 Code No. C100A FL wheel speed sensor circuit Code No. C1015 FR wheel speed sensor circuit Code No. C1020 RL wheel speed sensor circuit Code No. C102B RR wheel speed sensor circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35B-12 Code No. C1011 FL wheel speed sensor signal Code No. C101C FR wheel speed sensor signal Code No. C1027 RL wheel speed sensor signal Code No. C1032 RR wheel speed sensor signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35B-15 Code No. C1014 FL wheel speed sensor performance Code No. C101F FR wheel speed sensor performance Code No. C102A RL wheel speed sensor performance Code No. C1035 RR wheel speed sensor performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35B-18 Code No. C1041 FL wheel speed tone performance Code No. C1042 FR wheel speed tone performance Code No. C1043 RL wheel speed tone performance Code No. C1044 RR wheel speed tone performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35B-21 Code No. C1046 FL wheel speed sensor phase Code No. C1047 FR wheel speed sensor phase Code No. C1048 RL wheel speed sensor phase Code No. C1049 RR wheel speed sensor phase . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35B-23 Code No. C104B FL inlet valve Code No. C104F FR inlet valve Code No. C1053 RL inlet valve Code No. C1057 RR inlet valve Code No. C105F FL outlet valve Code No. C1063 FR outlet valve Code No. C1067 RL outlet valve Code No. C105B RR outlet valve . . . . . . . . 35B-26 Code No. C2104 Valve power supply circuit 35B-27 Code No. C1073 Motor drive circuit . . . . . . 35B-29 Code No. C2116 Pump motor voltage low . 35B-30 Code No. C1000 Brake SW (stuck) . . . . . . . 35B-32 Code No. C2200 ECU internal error . . . . . . 35B-33 Code No. C2101 Power supply high voltage ...................................... 35B-33 Code No. C1395 Incomplete Brake fluid filling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35B-34 Code No. C1210 Longitudinal G SNS.input circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35B-34 Code No. C1242 Longitudinal G sensor signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35B-35 Code No. C123A: Sensor calibration Code No. C2002: Valve calibration not completed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35B-36 Code No. C1608 EEPROM fail . . . . . . . . . . 35B-37 Code No.C1707: Implausible coding data . . 35B-39 Code No. C2204 Sensor cluster internal error . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35B-40 Code No. U0114 4WD CAN timeout Code No. U0141 ETACS CAN timeout . . . . 35B-40 Code No. U1073 Bus-off . . . . . . . . . . . . . . . 35B-41 35B-2 Code No. U1195 Coding not completed Code No. U1197 Coding data unavailable . 35B-42 Inspection Procedure 10: The initial check sound of hydraulic unit is loud. . . . . . . . . . . . . . . . . . . 35B-54 TROUBLE SYMPTOM CHART. . . . . . . . . . 35B-43 DATA LIST REFERENCE TABLE . . . . . . . . 35B-54 SYMPTOM PROCEDURES . . . . . . . . . . . . 35B-44 ACTUATOR TEST REFERENCE TABLE . . 35B-55 CHECK AT ECU TERMINALS . . . . . . . . . . 35B-56 Inspection Procedure 1: M.U.T.-III cannot communication only with ABS-ECU. . . . . . . 35B-44 Inspection Procedure 2: Brake warning lamp stays ON with the parking brake lever released. . . . . 35B-44 Inspection Procedure 3: ABS warning lamp does not illuminate when ignition switch is turned to the ON position (engine stopped).. . . . . . . . . . . . . . 35B-46 Inspection Procedure 4: Brake warning lamp does not illuminate when the ignition switch is turned to ON position (Engine stopped). . . . . . . . . . . . . . 35B-47 Inspection Procedure 5: ABS warning lamp stays ON after the engine is started.. . . . . . . . . . . . . . 35B-48 Inspection Procedure 6: Abnormality in brake operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35B-49 ON-VEHICLE SERVICE . . . . . . . . . . . 35B-58 WHEEL SPEED SENSOR OUTPUT CURRENT MEASUREMENT. . . . . . . . . . . . . . . . . . . . . 35B-58 HYDRAULIC UNIT CHECK . . . . . . . . . . . . . 35B-59 IN THE EVENT OF A DISCHARGED BATTERY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35B-61 HYDRAULIC UNIT . . . . . . . . . . . . . . . 35B-61 REMOVAL AND INSTALLATION . . . . . . . . 35B-61 WHEEL SPEED SENSOR . . . . . . . . . 35B-63 Inspection Procedure 7: ABS system inoperative . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35B-50 REMOVAL AND INSTALLATION <FRONT> ...................................... 35B-63 Inspection Procedure 8: ABS-ECU power supply circuit system. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35B-51 REMOVAL AND INSTALLATION <REAR>. 35B-65 INSPECTION. . . . . . . . . . . . . . . . . . . . . . . . 35B-67 INSPECTION PROCEDURE 9: ABS operates too frequently. . . . . . . . . . . . . . . . . . . . . . . . . . . 35B-53 ANTI-SKID BRAKING SYSTEM (ABS) 35B-3 SERVICE SPECIFICATIONS SERVICE SPECIFICATIONS M1352000300964 Item Standard value Wheel speed sensor current mA 5.9 − 8.4 or 11.8 − 16.8 Wheel speed sensor insulation resistance MΩ 5 or more SPECIAL TOOLS M1352000601883 Tool a MB992744 b MB992745 c DO NOT USE MB992746 d MB992747 e MB992748 ACB05421AB Number Name Use a. MB992744 b. MB992745 c. MB992746 d. MB992747 e. MB992748 ABS check (Diagnosis a. Vehicle code display and data list communication display by M.U.T.-III) interface-Lite (V.C.I.-Lite) b. V.C.I.-Lite main harness A (for vehicles with CAN communication) c. V.C.I.-Lite main harness B (for vehicles without CAN communication) d. V.C.I.-Lite USB cable short e. V.C.I.-Lite USB cable long ANTI-SKID BRAKING SYSTEM (ABS) 35B-4 SPECIAL TOOLS Tool a MB991824 b Number Name Use MB991955 a. MB991824 b. MB991827 c. MB991910 d. MB991911 e. MB991825 f. MB991826 M.U.T.-III sub-assembly a. Vehicle Communication Interface (V.C.I.) b. M.U.T.-III USB cable c. M.U.T.-III main harness A (Vehicles with CAN communication system) d. M.U.T.-III main harness B (Vehicles without CAN communication system) e. M.U.T.-III measurement adapter f. M.U.T.-III trigger harness CAUTION For vehicles with CAN communication, use the M.U.T.-III main harness A to send the simulated vehicle speed. If you connect the M.U.T.-III main harness B instead, the CAN communication does not function correctly. ABS check (Diagnosis code display and data list display by M.U.T.-III) MB992006 Extra fine probe Continuity check and voltage measurement at harness wire or connector for loose, corroded or damaged terminals, or terminals pushed back in the connector. MB991709 Wiring harness set Checking the ABS-ECU and output current measure at the wheel speed sensor MB991827 c MB991910 d DO NOT USE MB991911 e MB991825 f MB991826 MB991955 MB992006 ANTI-SKID BRAKING SYSTEM (ABS) 35B-5 TROUBLESHOOTING TROUBLESHOOTING DIAGNOSIS TROUBLESHOOTING FLOW NOTES WITH REGARD TO DIAGNOSIS M1352011100997 Refer to GROUP 00 − How to Use Troubleshooting/Contents of Troubleshooting . M1352012600393 1. The ABS is a system which controls the brake pressure by means of the operation of the ECU. Accordingly, the following symptoms may occur at times, but these are a sign of normal ABS operation, and do not indicate a malfunction. Phenomenon Explanation of phenomenon When the engine starts, a knocking sound can be heard coming This sound occurs as a result of system from the engine compartment. operation checking, and is not a malfunction. • Sound of the motor inside the ABS hydraulic unit operation. (whine) • Sound is the generated along with vibration of the brake pedal. (scraping) • When ABS operates, sound is generated from the vehicle chassis due to repeated brake application and release. (Thump: suspension; squeak: tyres) This is the sound of normal system operation, and is not a malfunction. Shocks are felt if the brake pedal is depressed when driving at low speed. This is due to system operation checking (starting-of check when the vehicle speed reaches a certain number of km/h) and is not a malfunction. 2. For road surfaces such as snow-covered roads and gravel roads, the braking distance for vehicles with ABS can sometimes be longer than that for other vehicles. Accordingly, advise the customer to drive safely on such roads by lowering the vehicle speed and not being too overconfident. 3. Diagnosis detection condition can vary depending on the diagnosis code. Make sure that checking requirements listed in the "Comment" are satisfied when checking the trouble symptom again. ABS warning lamp ABS WARNING LAMP AND BRAKE WARNING LAMP CHECK Approximately 3s M1352012001316 Check that ABS and brake warning lamps illuminate as follows. NOTE: The EBD warning lamp is also used as the brake warning lamp. Brake warning lamp ABS warning lamp, Brake warning lamp Illuminated Not illuminated START Ignition switch ON ACC, LOCK ACC00028AB 1. When the ignition switch is turned to the ON position, ABS and brake warning lamps illuminate. 2. The ABS and brake warning lamps illuminate for three seconds*1 and then turn OFF*2. 3. Otherwise, check the diagnosis code. ANTI-SKID BRAKING SYSTEM (ABS) 35B-6 TROUBLESHOOTING NOTE: . • *1: The ABS warning lamp may stay ON until the vehicle speed reaches 10 km/h. As far as ABS-ECU stores any diagnosis code related to the wheel speed sensor malfunction or the motor malfunction as past trouble, ABS-ECU continues illuminating the ABS warning lamp until it verifies that the malfunction for that code is resolved (startup check). • *2: The brake warning lamp does not turn OFF when the parking brake is applied or the brake fluid level is lowered. DIAGNOSTIC FUNCTION M1352011201726 ABS-ECU has the following functions for easier system checks. The following items can be diagnosed using M.U.T-III. • Diagnosis code set (Refer to P.35B-11). • Service data output (Refer to P.35B-54). • Actuator test (Refer to P.35B-55). • Freeze frame data output (Refer to ). CHECK OF FREEZE FRAME DATA The freeze frame data can be checked by using the M.U.T.-III. Display item list Item No. Item name When detecting fault and storing the diagnosis code, the ECU connected to CAN bus line obtains the data before the determination of the diagnosis code and the data when the diagnosis code is determined, and then stores the ECU status of that time. By analysing each data from M.U.T.-III, the troubleshooting can be performed more efficiently. The displayed items are as the table below. Data item Unit km 1 Odometer Total driving distance after the diagnosis code is generated 2 Ignition cycle Number of times the ignition switch is turned "ON" or Number of "LOCK (OFF)" after the past failure transition counts is displayed. 5 Power supply voltage Voltage of power supply when the diagnosis code is V generated 9 G sensor G sensor value when a diagnosis code is set 13 Stop lamp switch Stop light switch condition when the diagnosis code − is generated :OFF/ON 21 Pump motor Pump motor status (ON/OFF) when a diagnosis code is set − 301 ABS control ABS control when the diagnosis code is generated :OFF/ON − 401 FL wheel speed sensor Wheel speed (FL) when the diagnosis code is generated km/h 402 FR wheel speed sensor Wheel speed (FR) when the diagnosis code is generated km/h G ANTI-SKID BRAKING SYSTEM (ABS) 35B-7 TROUBLESHOOTING Item No. Item name Data item Unit 403 RL wheel speed sensor Wheel speed (RL) when the diagnosis code is generated km/h 404 RR wheel speed sensor Wheel speed (RR) when the diagnosis code is generated km/h FAIL-SAFE FUNCTION If any malfunction is detected by the self-diagnostic function, ABS-ECU illuminates the ABS warning lamp and brake warning lamp*, and it disables ABS and EBD control. NOTE: *: The brake warning lamp and display are used as EBD control warning lamp. Illumination condition of warning lamp and display in case of failure Diagno Item Countermeasures for failure sis Brake Brake code warning lamp warning No. display C100A FL wheel speed sensor circuit C1015 FR wheel speed sensor circuit C1020 RL wheel speed sensor circuit C102B RR wheel speed sensor circuit C1011 FL wheel speed sensor signal C101C FR wheel speed sensor signal C1027 RL wheel speed sensor signal C1032 RR wheel speed sensor signal C1014 FL wheel speed sensor performance C101F FR wheel speed sensor performance C102A RL wheel speed sensor performance C1035 RR wheel speed sensor performance C1041 FL wheel speed tone performance C1042 FR wheel speed tone performance C1043 RL wheel speed tone performance C1044 RR wheel speed tone performance C1046 FL wheel speed sensor phase C1047 FR wheel speed sensor phase C1048 RL wheel speed sensor phase C1049 RR wheel speed sensor phase ABS warning ABS warning lamp display OFF*1 OFF*1 ON*2 ON*2 OFF*1 OFF*1 ON*2 ON*2 OFF*1 OFF*1 ON*2 ON*2 OFF*1 OFF*1 ON*2 ON*2 OFF*1 OFF*1 ON*2 ON*2 ANTI-SKID BRAKING SYSTEM (ABS) 35B-8 TROUBLESHOOTING Diagno sis code No. Item C104B FL inlet valve C104F FR inlet valve C1053 RL inlet valve C1057 RR inlet valve C105F FL outlet valve C1063 FR outlet valve C1067 RL outlet valve C105B RR outlet valve C2104 Countermeasures for failure Brake Brake warning lamp warning display ABS warning ABS warning lamp display ON ON ON ON ON ON ON ON Valve power supply circuit ON ON ON ON C1073 Motor drive circuit OFF OFF ON*2 ON*2 C2116 Pump motor voltage low OFF OFF ON*2 ON*2 C1000 Brake SW (stuck) OFF OFF OFF OFF C2200 ECU internal error ON*3 ON*3 ON*3 ON*3 C2101 Power supply high voltage ON ON ON ON C1395 Incomplete Brake fluid filling*6 OFF OFF Flashes (2 Hz) ON C1210 Longitudinal G sensor input circuit*4 OFF OFF ON ON C1242 Longitudinal G sensor signal*4 OFF OFF ON ON C123A Sensor calibration*4 OFF OFF ON ON C1608 EEPROM fail OFF OFF OFF OFF C1707 Implausible coding data OFF OFF ON ON C2002 Valve calibration not completed OFF OFF ON ON C2204 Sensor cluster internal error*4 OFF OFF ON ON U0114 4WD CAN timeout OFF OFF OFF OFF U0141 ETACS CAN timeout OFF OFF OFF OFF U1073 Bus-off OFF OFF OFF OFF U1195 Coding not completed OFF OFF ON ON U1197 Coding data unavailable OFF OFF ON ON 18.0 ± 1.0 V or more NOTE: . • *1 • *2 :Stays ON until the vehicle speed reaches 10 km/h when the ignition switch is turned to ON next time, even if the malfunction is repaired and returns to normal condition. • *3 :May not illuminate depending on the trouble cause. • *4 :4WD :Turns ON when two or more wheels are faulty. ANTI-SKID BRAKING SYSTEM (ABS) 35B-9 TROUBLESHOOTING Under EBD and ABS control in case of failure Diagno Item Countermeasures for failure sis EBD control ABS control code No. C100A FL wheel speed sensor circuit Executed*1 Prohibited C1015 FR wheel speed sensor circuit C1020 RL wheel speed sensor circuit C102B RR wheel speed sensor circuit C1011 FL wheel speed sensor signal Executed*1 Prohibited C101C FR wheel speed sensor signal C1027 RL wheel speed sensor signal C1032 RR wheel speed sensor signal C1014 FL wheel speed sensor performance Executed*1 Prohibited C101F FR wheel speed sensor performance C102A RL wheel speed sensor performance C1035 RR wheel speed sensor performance C1041 FL wheel speed tone performance Executed*1 Prohibited C1042 FR wheel speed tone performance C1043 RL wheel speed tone performance C1044 RR wheel speed tone performance C1046 FL wheel speed sensor phase Executed*1 Prohibited C1047 FR wheel speed sensor phase C1048 RL wheel speed sensor phase C1049 RR wheel speed sensor phase C104B FL inlet valve Prohibited Prohibited C104F FR inlet valve C1053 RL inlet valve C1057 RR inlet valve C105F FL outlet valve Prohibited Prohibited C1063 FR outlet valve C1067 RL outlet valve C105B RR outlet valve C2104 Valve power supply circuit Prohibited Prohibited C1073 Motor drive circuit Executed Prohibited C2116 Pump motor voltage low Executed Prohibited ANTI-SKID BRAKING SYSTEM (ABS) 35B-10 TROUBLESHOOTING Diagno Item sis code No. Countermeasures for failure EBD control ABS control C1000 Brake SW (stuck) Executed Executed C2200 ECU internal error Prohibited*2 Prohibited*2 C2101 Power supply high voltage Prohibited Prohibited C1395 Incomplete Brake fluid filling Executed Executed C1210 Longitudinal G sensor input circuit*3 Executed Prohibited C1242 Longitudinal G sensor signal*3 Executed Prohibited C123A Sensor calibration*3 Executed Prohibited C1608 EEPROM fail Executed Executed C1707 Implausible coding data Executed Prohibited C2002 Valve calibration not completed Executed Prohibited C2204 Sensor cluster internal error*3 Executed Prohibited U0114 4WD CAN timeout Executed Executed U0141 ETACS CAN timeout Executed Executed U1073 Bus-off Executed Executed U1195 Coding not completed Executed Prohibited U1197 Coding data unavailable Executed Prohibited 18.0 ± 1.0 V or more NOTE: . • *1: • *2 • *3: Prohibited when two or more wheels are faulty. : Not prohibited when the brake warning lamp is not ON. 4WD HOW TO READ DIAGNOSIS CODE CAUTION When reading a diagnosis code, be sure to read it after erasing once because the diagnosis code could be set as a past trouble. Refer to GROUP 00 − How to Use Troubleshooting and Inspection Service Points . HOW TO ERASE DIAGNOSIS CODE Refer to GROUP 00 − How to Use Troubleshooting and Inspection Service Points . ANTI-SKID BRAKING SYSTEM (ABS) 35B-11 TROUBLESHOOTING DIAGNOSIS CODE CHART M1352011301949 CAUTION During diagnosis, a diagnosis code associated with other system may be set when the ignition switch is turned on with connector(s) disconnected. On completion, confirm all systems for diagnosis code(s). If diagnosis code(s) are set, erase them all. Diagnosis code Item No. Reference page C100A FL wheel speed sensor circuit P.35B-12 C1015 FR wheel speed sensor circuit C1020 RL wheel speed sensor circuit C102B RR wheel speed sensor circuit C1011 FL wheel speed sensor signal C101C FR wheel speed sensor signal C1027 RL wheel speed sensor signal C1032 RR wheel speed sensor signal C1014 FL wheel speed sensor .performance C101F FR wheel speed sensor performance C102A RL wheel speed sensor performance C1035 RR wheel speed sensor performance C1041 FL wheel speed tone performance C1042 FR wheel speed tone performance C1043 RL wheel speed tone performance C1044 RR wheel speed tone performance C1046 FL wheel speed sensor phase C1047 FR wheel speed sensor phase C1048 RL wheel speed sensor phase C1049 RR wheel speed sensor phase C104B FL inlet valve C104F FR inlet valve C1053 RL inlet valve C1057 RR inlet valve C105F FL outlet valve C1063 FR outlet valve C1067 RL outlet valve C105B RR outlet valve C2104 Valve power supply circuit P.35B-27 C1073 Motor drive circuit P.35B-29 C2116 Pump motor voltage low P.35B-30 C1000 Brake SW (stuck) P.35B-32 C2200 ECU internal error P.35B-33 C2101 Power supply high voltage P.35B-15 P.35B-18 P.35B-21 P.35B-23 P.35B-26 18.0 ± 1.0 V or more P.35B-33 ANTI-SKID BRAKING SYSTEM (ABS) 35B-12 TROUBLESHOOTING Diagnosis code Item No. Reference page C1395 Incomplete Brake fluid filling P.35B-34 C1210 Longitudinal G sensor input circuit <4WD> Abnormality in output voltage P.35B-34 C1242 Longitudinal G sensor signal <4WD> Abnormality in output voltage P.35B-35 C123A Sensor calibration <4WD> C2002 Valve calibration not completed C1608 EEPROM fail P.35B-37 C1707 Implausible coding data P.35B-39 C2204 Sensor cluster internal error <4WD> P.35B-40 U0114 4WD CAN timeout P.35B-40 U0141 ETACS CAN timeout U1073 Bus-off P.35B-41 U1195 Coding not completed P.35B-42 U1197 Coding data unavailable P.35B-36 DIAGNOSIS CODE PROCEDURES Code No. C100A FL wheel speed sensor circuit Code No. C1015 FR wheel speed sensor circuit Code No. C1020 RL wheel speed sensor circuit Code No. C102B RR wheel speed sensor circuit CAUTION If there is any problem in the CAN bus lines, an incorrect diagnosis code may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C − CAN Bus Diagnostics Table ). OPERATION • The wheel speed sensor is a kind of a pulse generator. It consists of encoders (a plate on which north and south pole sides of the magnets are arranged alternately) for detecting the wheel speed which rotates at the same speed of the wheels and wheel speed sensors. This sensor outputs frequency pulse signals in proportion to the wheel speed. • The pulse signals, which the wheel speed sensor creates, are sent to ABS-ECU. ABS-ECU uses the frequency of the pulse signals to determine the wheel speed. DIAGNOSIS CODE SET CONDITIONS ABS-ECU monitors the voltage fluctuation in each wheel speed sensor circuit. If ABS-ECU detects the open or short circuit in the circuit, it will set a diagnosis code. PROBABLE CAUSES Current trouble • Damaged wiring harness and connectors • Noise interference • Malfunction of wheel speed sensor • ABS-ECU malfunction Past trouble • Carry out diagnosis with particular emphasis on wiring harness and connector failures between ABS-ECU and the wheel speed sensor. For diagnosis procedures, refer to How to treat past trouble (GROUP 00 − How to Use Troubleshooting/How to Treat Past Trouble ). ANTI-SKID BRAKING SYSTEM (ABS) TROUBLESHOOTING DIAGNOSTIC PROCEDURE STEP 1. M.U.T.-III CAN bus diagnostics Use M.U.T.-III to diagnose the CAN bus lines. Q: Is the check result normal? YES : Go to Step 3. NO : Repair the CAN bus lines (Refer to GROUP 54C − CAN Bus Diagnostics Table ). On completion, go to Step 2. STEP 2. Diagnosis code recheck after resetting CAN bus lines Q: Is the diagnosis code C100A, C1015, C1020 or C102B set? YES : Go to Step 3. NO : The procedure is complete. STEP 3. M.U.T.-III data list Check the following data list (Refer to P.35B-54). • Item No.01: FL wheel speed sensor • Item No.02: FR wheel speed sensor • Item No.03: RL wheel speed sensor • Item No.04: RR wheel speed sensor Q: Is the check result normal? YES : Go to Step 10. NO : Go to Step 4. 35B-13 Code No.C100A is set • Measure the voltage between the ABS-ECU connector (FL+ terminal) and the body earth, and between the ABS-ECU connector (FLterminal) and the body earth. OK: 1 V or less Code No.C1015 is set • Measure the voltage between the ABS-ECU connector (FR+ terminal) and the body earth, and between the ABS-ECU connector (FRterminal) and the body earth. OK: 1 V or less Code No.C1020 is set • Measure the voltage between the ABS-ECU connector (RL+ terminal) and the body earth, and between the ABS-ECU connector (RLterminal) and the body earth. OK: 1 V or less Code No.C102B is set • Measure the voltage between the ABS-ECU connector (RR+ terminal) and the body earth, and between the ABS-ECU connector (RRterminal) and the body earth. OK: 1 V or less Q: Is the check result normal? YES : Go to Step 5. NO : Go to Step 6. STEP 4. Voltage measurement at the ABS-ECU connector (FL+, FL-, FR+, FR-, RL+, RL-, RR+, RR- terminal) (1) Disconnect the connector, and measure at the wiring harness side. (2) Turn the ignition switch to the ON position. STEP 5. Resistance measurement at ABS-ECU connector (FL+, FL-, FR+, FR-, RL+, RL-, RR+, RR- terminal) Disconnect the connector, and measure at the wiring harness side. Code No.C100A is set • Measure the resistance between the ABS-ECU connector (FL+ terminal) and the body earth, and between the ABS-ECU connector (FL- terminal) and the body earth. OK: No continuity Code No.C1015 is set • Measure the resistance between the ABS-ECU connector (FR+ terminal) and the body earth, and between the ABS-ECU connector (FR- terminal) and the body earth. OK: No continuity Code No.C1020 is set • Measure the resistance between the ABS-ECU connector (RL+ terminal) and the body earth, and between the ABS-ECU connector (RL- terminal) and the body earth. OK: No continuity Code No.C102B is set • Measure the resistance between the ABS-ECU connector (RR+ terminal) and the body earth, and between the ABS-ECU connector (RR- terminal) and the body earth. OK: No continuity Q: Is the check result normal? YES : Go to Step 7. NO : Go to Step 6. 35B-14 ANTI-SKID BRAKING SYSTEM (ABS) TROUBLESHOOTING STEP 6. Check the wiring harness between the ABS-ECU connector terminal and the wheel speed sensor connector terminal. Code No.C100A is set • Check of short circuit in FL+, FL- line between ABS-ECU connector and front wheel speed sensor (LH) connector. Code No.C1015 is set • Check of short circuit in FR+, FR- line between ABS-ECU connector and front wheel speed sensor (RH) connector. Code No.C1020 is set • Check of short circuit in RL+, RL- line between ABS-ECU connector and rear wheel speed sensor (LH) connector. Code No.C102B is set • Check of short circuit in RR+, RR- line between ABS-ECU connector and rear wheel speed sensor (LH) connector. Q: Is the check result normal? YES : Replace the wheel speed sensor (Refer to P.35B-63 <front> or P.35B-65 <rear>). Then go to Step 11. NO : Repair the connector(s) or wiring harness. Then go to Step 11. STEP 7. Resistance measurement at the ABS-ECU connector (FL+, FL-, FR+, FR-, RL+, RL-, RR+, RR- terminal) Disconnect the connector, and measure at the wiring harness side. Code No.C100A is set • Measure the resistance between the ABS-ECU connector (FL+ terminal) and the ABS-ECU connector (FL- terminal). OK: Continuity Code No.C1015 is set • Measure the resistance between the ABS-ECU connector (FR+ terminal) and the ABS-ECU connector (FR- terminal). OK: Continuity Code No.C1020 is set • Measure the resistance between the ABS-ECU connector (RL+ terminal) and the ABS-ECU connector (RL- terminal). OK: Continuity Code No.C102B is set • Measure the resistance between the ABS-ECU connector (RR+ terminal) and the ABS-ECU connector (RR- terminal). OK: Continuity Q: Is the check result normal? YES : Go to Step 8. NO : Go to Step 10. STEP 8. Check the wiring harness between the ABS-ECU connector terminal and the wheel speed sensor connector terminal. Code No.C100A is set • Check of open circuit in FL+, FL- line between ABS-ECU connector and front wheel speed sensor (LH) connector. Code No.C1015 is set • Check of open circuit in FR+, FR- line between ABS-ECU connector and front wheel speed sensor (RH) connector. Code No.C1020 is set • Check of open circuit in RL+, RL- line between ABS-ECU connector and rear wheel speed sensor (LH) connector. Code No.C102B is set • Check of open circuit in RR+, RR- line between ABS-ECU connector and rear wheel speed sensor (RH) connector. Q: Is the check result normal? YES : Go to Step 9. NO : Repair the connector(s) or wiring harness. Then go to Step 11. STEP 9. Check for wheel speed sensor as a single unit Refer to P.35B-67. Q: Is the check result normal? YES : Go to Step 10. NO : Replace the wheel speed sensor (Refer to P.35B-63 <front> or P.35B-65 <rear>). Then go to Step 11. STEP 10. Check whether the diagnosis code is reset. (1) Erase the diagnosis code. (2) Drive the vehicle at 20 km/h or higher. ANTI-SKID BRAKING SYSTEM (ABS) TROUBLESHOOTING NOTE: The ABS warning lamp does not turn OFF in some cases unless the vehicle runs at 20 km/h or higher. Q: Is the diagnosis code C100A, C1015, C1020 or C102B set? YES : Replace the hydraulic unit (integrated with ABS-ECU) (Refer to P.35B-61). Then go to Step 11. NO : Intermittent malfunction (Refer to GROUP 00 − How to Use Troubleshooting/How to Cope with Intermittent Malfunctions ). 35B-15 STEP 11. Check whether the diagnosis code is reset. (1) Erase the diagnosis code. (2) Drive the vehicle at 20 km/h or higher. NOTE: The ABS warning lamp does not turn OFF in some cases unless the vehicle runs at 20 km/h or higher. Q: Is the diagnosis code C100A, C1015, C1020 or C102B set? YES : Return to Step 1. NO : This diagnosis is complete. Code No. C1011 FL wheel speed sensor signal Code No. C101C FR wheel speed sensor signal Code No. C1027 RL wheel speed sensor signal Code No. C1032 RR wheel speed sensor signal CAUTION If there is any problem in the CAN bus lines, an incorrect diagnosis code may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C − CAN Bus Diagnostics Table ). OPERATION • The wheel speed sensor is a kind of a pulse generator. It consists of encoders (a plate on which north and south pole sides of the magnets are arranged alternately) for detecting the wheel speed which rotates at the same speed of the wheels and wheel speed sensors. This sensor outputs frequency pulse signals in proportion to the wheel speed. • The pulse signals, which the wheel speed sensor creates, are sent to ABS-ECU. ABS-ECU uses the frequency of the pulse signals to determine the wheel speed. DIAGNOSIS CODE SET CONDITIONS ABS-ECU monitors the signals from each wheel speed sensor while the vehicle is being driven. If any fault below is found in these sensor signals, ABS-ECU will set the relevant diagnosis code. • Irregular change in the wheel speed sensor signal • Wheel speed sensor signal continuously indicates high value. PROBABLE CAUSES Current trouble • Excessive gap between the wheel speed sensor and the wheel speed detection encoder • Adhesion of foreign materials on the wheel speed sensor • Adhesion of foreign materials on the wheel speed detection encoder • Wheel bearing malfunction • Malfunction of wheel speed sensor • Damaged wiring harness and connectors • External noise interference • Improper installation of the wheel speed sensor • Deformation of the wheel speed detection encoder • ABS-ECU malfunction • Disturbance of magnetisation pattern for wheel speed detection encoder • The number of poles on the magnetic encoder for wheel speed detection (the number of N-pole and S-pole) is changed. Past trouble • When the diagnosis code No. C100A, C1015, C1020 or C102B is also set, carry out diagnosis with particular emphasis on wiring harness and connector failures between ABS-ECU and the wheel speed sensor. For diagnosis procedures, refer to How to treat past trouble (GROUP 00 − How to Use Troubleshooting/How to Treat Past Trouble ). • When the diagnosis code No. C100A, C1015, C1020 or C102B is not set, the following conditions may be present: • Some wheels slip • Unstable vehicle attitude • External noise interference • Vehicle ran with the parking brake applied. 35B-16 ANTI-SKID BRAKING SYSTEM (ABS) TROUBLESHOOTING DIAGNOSTIC PROCEDURE STEP 1. M.U.T.-III CAN bus diagnosis Use M.U.T.-III to diagnose the CAN bus lines. Q: Is the check result normal? YES : Go to Step 3. NO : Repair the CAN bus lines (Refer to GROUP 54C − CAN Bus Diagnostics Table ). On completion, go to Step 2. STEP 2. Diagnosis code recheck after resetting CAN bus lines Q: Is the diagnosis code No.C1011, C101C, C1027 or C1032 set? YES : Go to Step 3. NO : This diagnosis is complete. STEP 3. M.U.T.-III diagnosis code Check that the diagnosis code No. C100A, C1015, C1020 or C102B is also set. Q: Is the diagnosis code No.C100A, C1015, C1020 or C102B also set? YES : Perform the diagnosis for the diagnosis code No.C100A, C1015, C1020 or C102B (Refer to P.35B-12). NO : Go to Step 4. STEP 4. Check the wiring harness between the ABS-ECU connector terminal and the wheel speed sensor connector terminal Code No.C1011 is set • Check of short to power supply, short to earth, and open circuit in FL+, FL− line between ABS-ECU connector and front wheel speed sensor (LH) connector. Code No.C101C is set • Check of short to power supply, short to earth, and open circuit in FR+, FR− line between ABS-ECU connector and front wheel speed sensor (RH) connector. Code No.C1027 is set • Check of short to power supply, short to earth, and open circuit in RL+, RL− line between ABS-ECU connector and rear wheel speed sensor (LH) connector. Code No.C1032 is set • Check of short to power supply, short to earth, and open circuit in RR+, RR− line between ABS-ECU connector and rear wheel speed sensor (RH) connector. Q: Is the check result normal? YES : Go to Step 5. NO : Repair the connector(s) or wiring harness. Then go to Step 11. STEP 5. Check for wheel speed sensor installation Check how the wheel speed sensor is installed (Disconnection of wheel speed sensor, loose mounting bolt, etc.). Q: Is the check result normal? YES : Go to Step 6. NO : Reinstall the wheel speed sensor correctly (Refer to P.35B-63 <front> or P.35B-65 <rear>). Then go to Step 6. STEP 6. Check for wheel speed sensor output current Refer to P.35B-58. Q: Is the check result normal? YES : Go to Step 7. NO : Replace the wheel speed sensor (Refer to P.35B-63 <front> or P.35B-65 <rear>). Then go to Step 10. ANTI-SKID BRAKING SYSTEM (ABS) 35B-17 TROUBLESHOOTING STEP 7. Check for wheel bearing looseness NOTE: Loose wheel bearing may increase the gap between the wheel speed sensor and the wheel speed detection magnet encoder. Check the wheel bearing for looseness. <Refer to GROUP 26 − Wheel Bearing Axial Play Check . (front), GROUP 27A − Wheel Bearing Axial Play Check (rear-2WD) or GROUP 27B − Wheel Bearing Axial Play Check (rear-4WD)> Q: Is the check result normal? YES : Go to Step 8. NO : Replace the wheel bearing <front> or rear wheel hub assembly <rear>. <Refer to GROUP 26 − Front Axle Hub Assembly (front), GROUP 27A − Rear Axle Hub Assembly (rear-2WD) or GROUP 27B − Rear Axle Hub Assembly (rear-4WD)> Then go to Step 11. STEP 8. Check of wheel speed detection encoder <Front> Oil seal Wheel bearing Magnetic encoder AC504925 AD <Rear> <2WD> Ball bearing Rear hub assembly Magnetic encoder <4WD> Rear wheel bearing Magnetic encoder Rear hub assembly AC808708 AC Check the encoder for adhesion of foreign materials or deformation. Q: Is the check result normal? YES : Go to Step 9. NO (Adhesion of foreign materials) : Remove the foreign materials and clean the encoder so as not to disturb the magnetization pattern on it while taking care of the magnet, magnetic substance, and magnetic attraction. Then go to Step 11. NO (Deformation) : Replace the wheel bearing <front> or rear wheel hub assembly <rear>. <Refer to GROUP 26 − Front Axle Hub Assembly (front), GROUP 27A − Rear Axle Hub Assembly (rear-2WD) or GROUP 27B − Rear Axle Hub Assembly (rear-4WD)> Then go to Step 11. 35B-18 ANTI-SKID BRAKING SYSTEM (ABS) TROUBLESHOOTING STEP 9. Check whether the diagnosis code is reset. (1) Erase the diagnosis code. (2) Drive the vehicle at 20 km/h or higher. NOTE: The ABS warning lamp does not turn OFF in some cases unless the vehicle runs at 20 km/h or higher. Q: Is the diagnosis code No.C1011, C101C, C1027 or C1032 set? YES : Replace the wheel speed sensor (Refer to P.35B-63 <front> or P.35B-65 <rear>). Then go to Step 10. NO : Intermittent malfunction (Refer to GROUP 00 − How to Use Troubleshooting/How to Cope with Intermittent Malfunctions ). STEP 10. Check whether the diagnosis code is reset. (1) Erase the diagnosis code. (2) Drive the vehicle at 20 km/h or higher. NOTE: The ABS warning lamp does not turn OFF in some cases unless the vehicle runs at 20 km/h or higher. Q: Is the diagnosis code No.C1011, C101C, C1027 or C1032 set? YES : Replace the hydraulic unit (integrated with ABS-ECU) (Refer to P.35B-61). Then go to Step 11. NO : This diagnosis is complete. STEP 11. Check whether the diagnosis code is reset. (1) Erase the diagnosis code. (2) Drive the vehicle at 20 km/h or higher. NOTE: The ABS warning lamp does not turn OFF in some cases unless the vehicle runs at 20 km/h or higher. Q: Is the diagnosis code No.C1011, C101C, C1027 or C1032 set? YES : Return to Step 1. NO : This diagnosis is complete. Code No. C1014 FL wheel speed sensor performance Code No. C101F FR wheel speed sensor performance Code No. C102A RL wheel speed sensor performance Code No. C1035 RR wheel speed sensor performance CAUTION If there is any problem in the CAN bus lines, an incorrect diagnosis code may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C − CAN Bus Diagnostics Table ). OPERATION • The wheel speed sensor is a kind of a pulse generator. It consists of encoders (a plate on which north and south pole sides of the magnets are arranged alternately) for detecting the wheel speed which rotates at the same speed of the wheels and wheel speed sensors. This sensor outputs frequency pulse signals in proportion to the wheel speed. • The pulse signals, which the wheel speed sensor creates, are sent to ABS-ECU. ABS-ECU uses the frequency of the pulse signals to determine the wheel speed. DIAGNOSIS CODE SET CONDITIONS ABS-ECU monitors the signals from each wheel speed sensor while the vehicle is being driven. If any fault below is found in these sensor signals, ABS-ECU will set the relevant diagnosis code. • Missing wheel speed sensor signal • Wheel speed sensor signal continuously indicates low value than the other wheel speed sensor signals. PROBABLE CAUSES Current trouble • Excessive gap between the wheel speed sensor and the magnetic encoder for wheel speed detection • Wheel bearing malfunction • Deformation of the magnetic encoder for wheel speed detection • Adhesion of foreign materials on the wheel speed sensor • Adhesion of foreign materials on the magnetic encoder for wheel speed detection • Malfunction of wheel speed sensor • Improper installation of the wheel speed sensor • ABS-ECU malfunction • Disturbance of magnetization pattern for magnetic encoder for wheel speed detection ANTI-SKID BRAKING SYSTEM (ABS) TROUBLESHOOTING • The number of poles on the magnetic encoder for wheel speed detection (the number of N-pole and S-pole) is changed. Past trouble • When the diagnosis code No. C100A, C1015, C1020 or C102B is also set, carry out diagnosis with particular emphasis on wiring harness and connector failures between ABS-ECU and the wheel speed sensor. For diagnosis procedures, refer to How to treat past trouble (GROUP 00 − How to Use Troubleshooting/How to Treat Past Trouble ). • When the diagnosis code No. C100A, C1015, C1020 or C102B is not set, the following conditions may be present: • Some wheels slip. • Unstable vehicle attitude • External noise interference • Vehicle ran with the parking brake applied. • Only two wheels are rotated on a drum tester. DIAGNOSIS PROCEDURE STEP 1. M.U.T.-III CAN bus diagnosis Use M.U.T.-III to diagnose the CAN bus lines. Q: Is the check result normal? YES : Go to Step 3. NO : Repair the CAN bus lines (Refer to GROUP 54C − CAN Bus Diagnostics Table ). On completion, go to Step 2. STEP 2. Diagnosis code recheck after resetting CAN bus lines Q: Is the diagnosis code No.C1014, C101F, C102A or C1035 set? YES : Go to Step 3. NO : This diagnosis is complete. STEP 3. M.U.T.-III diagnosis code Check that the diagnosis code No.C100A, C1015, C1020 or C102B is also set. Q: Is the diagnosis code No.C100A, C1015, C1020 or C102B also set? YES : Perform the diagnosis for the diagnosis code No.C100A, C1015, C1020 or C102B (Refer to P.35B-12). NO : Go to Step 4. 35B-19 STEP 4. Check the wiring harness between the ABS-ECU connector terminal and the wheel speed sensor connector terminal Code No.C1014 is set • Check of short to power supply, short to earth, and open circuit in FL+, FL− line between ABS-ECU connector and front wheel speed sensor (LH) connector. Code No.C101F is set • Check of short to power supply, short to earth, and open circuit in FR+, FR− line between ABS-ECU connector and front wheel speed sensor (RH) connector. Code No.C102A is set • Check of short to power supply, short to earth, and open circuit in RL+, RL− line between ABS-ECU connector and rear wheel speed sensor (LH) connector. Code No.C1035 is set • Check of short to power supply, short to earth, and open circuit in RR+, RR− line between ABS-ECU connector and rear wheel speed sensor (RH) connector. Q: Is the check result normal? YES : Go to Step 5. NO : Repair the connector(s) or wiring harness. Then go to Step 11. STEP 5. Check for wheel speed sensor installation Check how the wheel speed sensor is installed (Disconnection of wheel speed sensor, loose mounting bolt, etc.). Q: Is the check result normal? YES : Go to Step 6. NO : Reinstall the wheel speed sensor correctly (Refer to P.35B-63 <front> or P.35B-65 <rear>). Then go to Step 6. STEP 6. Check for wheel speed sensor output current Refer to P.35B-58. Q: Is the check result normal? YES : Go to Step 7. NO : Replace the wheel speed sensor (Refer to P.35B-63 <front> or P.35B-65 <rear>). Then go to Step 10. 35B-20 ANTI-SKID BRAKING SYSTEM (ABS) TROUBLESHOOTING STEP 7. Check for wheel bearing looseness NOTE: Loose wheel bearing may increase the gap between the wheel speed sensor and the wheel speed detection magnet encoder. Check the wheel bearing for looseness. <Refer to GROUP 26 − Wheel Bearing Axial Play Check . (front), GROUP 27A − Wheel Bearing Axial Play Check (rear-2WD) or GROUP 27B − Wheel Bearing Axial Play Check (rear-4WD)> Q: Is the check result normal? YES : Go to Step 8. NO : Replace the wheel bearing <front> or rear wheel hub assembly <rear>. <Refer to GROUP 26 − Front Axle Hub Assembly (front), GROUP 27A − Rear Axle Hub Assembly (rear-2WD) or GROUP 27B − Rear Axle Hub Assembly (rear-4WD)> Then go to Step 11. STEP 8. Check of wheel speed detection encoder <Front> Oil seal Wheel bearing Magnetic encoder AC504925 AD <Rear> <2WD> Ball bearing Rear hub assembly Magnetic encoder <4WD> Rear wheel bearing Magnetic encoder Rear hub assembly AC808708 AC Check the encoder for adhesion of foreign materials or deformation. Q: Is the check result normal? YES : Go to Step 9. NO (Adhesion of foreign materials) : Remove the foreign materials and clean the encoder so as not to disturb the magnetisation pattern on it while taking care of the magnet, magnetic substance, and magnetic attraction. Then go to Step 11. NO (Deformation) : Replace the wheel bearing <front> or rear wheel hub assembly <rear>. <Refer to GROUP 26 − Front Axle Hub Assembly (front), GROUP 27A − Rear Axle Hub Assembly (rear-2WD) or GROUP 27B − Rear Axle Hub Assembly (rear-4WD)> Then go to Step 11. ANTI-SKID BRAKING SYSTEM (ABS) TROUBLESHOOTING STEP 9. Check whether the diagnosis code is reset. (1) Erase the diagnosis code. (2) Drive the vehicle at 20 km/h or higher. NOTE: The ABS warning lamp does not turn OFF in some cases unless the vehicle runs at 20 km/h or higher. Q: Is the diagnosis code No.C1014, C101F, C102A or C1035 set? YES : Replace the wheel speed sensor (Refer to P.35B-63 <front> or P.35B-65 <rear>). Then go to Step 10. NO : Intermittent malfunction (Refer to GROUP 00 − How to Use Troubleshooting/How to Cope with Intermittent Malfunctions ). STEP 10. Check whether the diagnosis code is reset. (1) Erase the diagnosis code. (2) Drive the vehicle at 20 km/h or higher. 35B-21 NOTE: The ABS warning lamp does not turn OFF in some cases unless the vehicle runs at 20 km/h or higher. Q: Is the diagnosis code No.C1014, C101F, C102A or C1035 set? YES : Replace the hydraulic unit (integrated with ABS-ECU) (Refer to P.35B-61). Then go to Step 11. NO : This diagnosis is complete. STEP 11. Check whether the diagnosis code is reset. (1) Erase the diagnosis code. (2) Drive the vehicle at 20 km/h or higher. NOTE: The ABS warning lamp does not turn OFF in some cases unless the vehicle runs at 20 km/h or higher. Q: Is the diagnosis code No.C1014, C101F, C102A or C1035 set? YES : Return to Step 1. NO : This diagnosis is complete. Code No. C1041 FL wheel speed tone performance Code No. C1042 FR wheel speed tone performance Code No. C1043 RL wheel speed tone performance Code No. C1044 RR wheel speed tone performance CAUTION If there is any problem in the CAN bus lines, an incorrect diagnosis code may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C − CAN Bus Diagnostics Table ). OPERATION • The wheel speed sensor is a kind of a pulse generator. It consists of encoders (a plate on which north and south pole sides of the magnets are arranged alternately) for detecting the wheel speed which rotates at the same speed of the wheels and wheel speed sensors. This sensor outputs frequency pulse signals in proportion to the wheel speed. • The pulse signals, which the wheel speed sensor creates, are sent to ABS-ECU. ABS-ECU uses the frequency of the pulse signals to determine the wheel speed. DIAGNOSIS CODE SET CONDITIONS ABS-ECU monitors the signals from each wheel speed sensor while the vehicle is being driven. If any periodical drop is found in these sensor signals, ABS-ECU will set the relevant diagnosis code. PROBABLE CAUSES • Wheel bearing malfunction • Deformation of the wheel speed detection encoder • Adhesion of foreign materials on the wheel speed detection encoder • ABS-ECU malfunction • The number of poles on the Magnetic encoder for wheel speed detection (N-pole and S-pole) is changed DIAGNOSIS PROCEDURE STEP 1. M.U.T.-III CAN bus diagnosis Use M.U.T.-III to diagnose the CAN bus lines. Q: Is the check result normal? YES : Go to Step 3. NO : Repair the CAN bus lines (Refer to GROUP 54C − CAN Bus Diagnostics Table ). On completion, go to Step 2. 35B-22 ANTI-SKID BRAKING SYSTEM (ABS) TROUBLESHOOTING STEP 2. Diagnosis code recheck after resetting CAN bus lines Q: Is the diagnosis code No.C1041, C1042, C1043 or C1044 set? YES : Go to Step 3. NO : This diagnosis is complete. STEP 3. Check for wheel bearing looseness NOTE: Loose wheel bearing may increase the gap between the wheel speed sensor and the wheel speed detection magnet encoder. Check the wheel bearing for looseness. <Refer to GROUP 26 − Wheel Bearing Axial Play Check . (front), GROUP 27A − Wheel Bearing Axial Play Check (rear-2WD) or GROUP 27B − Wheel Bearing Axial Play Check (rear-4WD)> Q: Is the check result normal? YES : Go to Step 4. NO : Replace the wheel bearing <front> or rear wheel hub assembly <rear>. <Refer to GROUP 26 − Front Axle Hub Assembly (front), GROUP 27A − Rear Axle Hub Assembly (rear-2WD) or GROUP 27B − Rear Axle Hub Assembly (rear-4WD)> Then go to Step 7. STEP 4. Check of wheel speed detection encoder <Front> Oil seal Wheel bearing Magnetic encoder AC504925 AD <Rear> <2WD> Ball bearing Rear hub assembly Magnetic encoder <4WD> Rear wheel bearing Magnetic encoder Rear hub assembly AC808708 AC Check the encoder for adhesion of foreign materials or deformation. Q: Is the check result normal? YES : Go to Step 5. NO (Adhesion of foreign materials) : Remove the foreign materials and clean the encoder so as not to disturb the magnetisation pattern on it while taking care of the magnet, magnetic substance, and magnetic attraction. Then go to Step 7. NO (Deformation) : Replace the wheel bearing <front> or rear wheel hub assembly <rear>. <Refer to GROUP 26 − Front Axle Hub Assembly (front), GROUP 27A − Rear Axle Hub Assembly (rear-2WD) or GROUP 27B − Rear Axle Hub Assembly (rear-4WD)> Then go to Step 7. ANTI-SKID BRAKING SYSTEM (ABS) TROUBLESHOOTING STEP 5. Check whether the diagnosis code is reset. (1) Erase the diagnosis code. (2) Drive the vehicle at 20 km/h or higher. NOTE: The ABS warning lamp does not turn OFF in some cases unless the vehicle runs at 20 km/h or higher. Q: Is the diagnosis code No.C1041, C1042, C1043 or C1044 set? YES : Replace the wheel speed sensor (Refer to P.35B-63 <front> or P.35B-65 <rear>). Then go to Step 6. NO : Intermittent malfunction (Refer to GROUP 00 − How to Use Troubleshooting/How to Cope with Intermittent Malfunctions ). STEP 6. Check whether the diagnosis code is reset. (1) Erase the diagnosis code. (2) Drive the vehicle at 20 km/h or higher. 35B-23 NOTE: The ABS warning lamp does not turn OFF in some cases unless the vehicle runs at 20 km/h or higher. Q: Is the diagnosis code No.C1041, C1042, C1043 or C1044 set? YES : Replace the hydraulic unit (integrated with ABS-ECU) (Refer to P.35B-61). Then go to Step 7. NO : This diagnosis is complete. STEP 7. Check whether the diagnosis code is reset. (1) Erase the diagnosis code. (2) Drive the vehicle at 20 km/h or higher. NOTE: The ABS warning lamp does not turn OFF in some cases unless the vehicle runs at 20 km/h or higher. Q: Is the diagnosis code No.C1041, C1042, C1043 or C1044 set? YES : Return to Step 1. NO : This diagnosis is complete. Code No. C1046 FL wheel speed sensor phase Code No. C1047 FR wheel speed sensor phase Code No. C1048 RL wheel speed sensor phase Code No. C1049 RR wheel speed sensor phase CAUTION If there is any problem in the CAN bus lines, an incorrect diagnosis code may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C − CAN Bus Diagnostics Table ). OPERATION • The wheel speed sensor is a kind of a pulse generator. It consists of encoders (a plate on which north and south pole sides of the magnets are arranged alternately) for detecting the wheel speed which rotates at the same speed of the wheels and wheel speed sensors. This sensor outputs frequency pulse signals in proportion to the wheel speed. • The pulse signals, which the wheel speed sensor creates, are sent to ABS-ECU. ABS-ECU uses the frequency of the pulse signals to determine the wheel speed. DIAGNOSIS CODE SET CONDITIONS This diagnosis code is set if any malfunction below is found: • When the brake fluid pressure is decreased for a long time. • When the brake fluid pressure is held for a long time. PROBABLE CAUSES • • • • • • • • • • • • Damaged wiring harness and connectors External noise interference Malfunction of wheel speed sensor ABS-ECU malfunction Excessive gap between the wheel speed sensor and the magnetic encoder for wheel speed detection Adhesion of foreign materials on the wheel speed sensor Adhesion of foreign materials on the magnetic encoder for wheel speed detection Wheel bearing malfunction Improper installation of the wheel speed sensor Deformation of the magnetic encoder for wheel speed detection Disturbance of magnetization pattern for magnetic encoder for wheel speed detection Missing teeth of the magnetic encoder for wheel speed detection 35B-24 ANTI-SKID BRAKING SYSTEM (ABS) TROUBLESHOOTING DIAGNOSTIC PROCEDURE STEP 1. M.U.T.-III CAN bus diagnosis Use M.U.T.-III to diagnose the CAN bus lines. Q: Is the check result normal? YES : Go to Step 3. NO : Repair the CAN bus lines (Refer to GROUP 54C − CAN Bus Diagnostics Table ). On completion, go to Step 2. STEP 2. Diagnosis code recheck after resetting CAN bus lines Q: Is the diagnosis code No.C1046, 1047, 1048 or 1049 set? YES : Go to Step 3. NO : This diagnosis is complete. STEP 3. M.U.T.-III diagnosis code Code No.C1046 is set • Check that the diagnosis codes No.C100A, C1011, C1014, and C1041 are also set. Code No.C1047 is set • Check that the diagnosis codes No.C1015, C101C, C101F, and C1042 are also set. Code No.C1048 is set • Check that the diagnosis codes No.C1020, C1027, C102A, and C1043 are also set. Code No.C1049 is set • Check that the diagnosis codes No.C102B, C1032, C1035, and C1044 are also set. Q: Are the diagnosis codes set? YES : Carry out the diagnosis for the relevant diagnosis codes. NO : Go to Step 4. STEP 5. Check the wiring harness between the ABS-ECU connector terminal and the wheel speed sensor connector terminal Code No.C1046 is set • Check of short to power supply, short to earth, and open circuit in FL+, FL− line between ABS-ECU connector and front wheel speed sensor (LH) connector. Code No.C1047 is set • Check of short to power supply, short to earth, and open circuit in FR+, FR− line between ABS-ECU connector and front wheel speed sensor (RH) connector. Code No.C1048 is set • Check of short to power supply, short to earth, and open circuit in RL+, RL− line between ABS-ECU connector and rear wheel speed sensor (LH) connector. Code No.C1049 is set • Check of short to power supply, short to earth, and open circuit in RR+, RR− line between ABS-ECU connector and rear wheel speed sensor (RH) connector. Q: Is the check result normal? YES : Go to Step 6. NO : Repair the connector(s) or wiring harness. Then go to Step 12. STEP 6. Check for wheel speed sensor installation Check how the wheel speed sensor is installed (Disconnection of wheel speed sensor, loose mounting bolt, etc.). Q: Is the check result normal? YES : Go to Step 7. NO : Reinstall the wheel speed sensor correctly (Refer to P.35B-63 <front> or P.35B-65 <rear>). Then go to Step 7. STEP 4. M.U.T.-III data list Check the following data list (Refer to P.35B-54). • Item No.01: FL wheel speed sensor • Item No.02: FR wheel speed sensor • Item No.03: RL wheel speed sensor • Item No.04: RR wheel speed sensor STEP 7. Check for wheel speed sensor output current Refer to P.35B-58. Q: Is the check result normal? YES : Go to Step 10. NO : Go to Step 5. Q: Is the check result normal? YES : Go to Step 8. NO : Replace the wheel speed sensor (Refer to P.35B-63 <front> or P.35B-65 <rear>). Then go to Step 11. ANTI-SKID BRAKING SYSTEM (ABS) 35B-25 TROUBLESHOOTING STEP 8. Check for wheel bearing looseness NOTE: Loose wheel bearing may increase the gap between the wheel speed sensor and the wheel speed detection magnet encoder. Check the wheel bearing for looseness. <Refer to GROUP 26 − Wheel Bearing Axial Play Check . (front), GROUP 27A − Wheel Bearing Axial Play Check (rear-2WD) or GROUP 27B − Wheel Bearing Axial Play Check (rear-4WD)> Q: Is the check result normal? YES : Go to Step 9. NO : Replace the wheel bearing <front> or rear wheel hub assembly <rear>. <Refer to GROUP 26 − Front Axle Hub Assembly (front), GROUP 27A − Rear Axle Hub Assembly (rear-2WD) or GROUP 27B − Rear Axle Hub Assembly (rear-4WD)> Then go to Step 12. STEP 9. Check of wheel speed detection encoder <Front> Oil seal Wheel bearing Magnetic encoder AC504925 AD <Rear> <2WD> Ball bearing Rear hub assembly Magnetic encoder <4WD> Rear wheel bearing Magnetic encoder Rear hub assembly AC808708 AC Check the encoder for adhesion of foreign materials or deformation. Q: Is the check result normal? YES : Go to Step 10. NO (Adhesion of foreign materials) : Remove the foreign materials and clean the encoder so as not to disturb the magnetization pattern on it while taking care of the magnet, magnetic substance, and magnetic attraction. Then go to Step 12. NO (Deformation) : Replace the wheel bearing <front> or rear wheel hub assembly <rear>. <Refer to GROUP 26 − Front Axle Hub Assembly (front), GROUP 27A − Rear Axle Hub Assembly (rear-2WD) or GROUP 27B − Rear Axle Hub Assembly (rear-4WD)> Then go to Step 12. 35B-26 ANTI-SKID BRAKING SYSTEM (ABS) TROUBLESHOOTING STEP 10. Check whether the diagnosis code is reset. (1) Erase the diagnosis code. (2) Drive the vehicle at 20 km/h or higher. NOTE: The ABS warning lamp does not turn OFF in some cases unless the vehicle runs at 20 km/h or higher. Q: Is the diagnosis code No.C1046, 1047, 1048 or 1049 set? YES : Replace the wheel speed sensor (Refer to P.35B-63 <front> or P.35B-65 <rear>). Then go to Step 11. NO : Intermittent malfunction (Refer to GROUP 00 − How to Use Troubleshooting/How to Cope with Intermittent Malfunctions ). STEP 11. Check whether the diagnosis code is reset. (1) Erase the diagnosis code. (2) Drive the vehicle at 20 km/h or higher. NOTE: The ABS warning lamp does not turn OFF in some cases unless the vehicle runs at 20 km/h or higher. Q: Is the diagnosis code No.C1046, 1047, 1048 or 1049 set? YES : Replace the hydraulic unit (integrated with ABS-ECU) (Refer to P.35B-61). Then go to Step 12. NO : This diagnosis is complete. STEP 12. Check whether the diagnosis code is reset. (1) Erase the diagnosis code. (2) Drive the vehicle at 20 km/h or higher. NOTE: The ABS warning lamp does not turn OFF in some cases unless the vehicle runs at 20 km/h or higher. Q: Is the diagnosis code No.C1046, 1047, 1048 or 1049 set? YES : Return to Step 1. NO : This diagnosis is complete. Code No. C104B FL inlet valve Code No. C104F FR inlet valve Code No. C1053 RL inlet valve Code No. C1057 RR inlet valve Code No. C105F FL outlet valve Code No. C1063 FR outlet valve Code No. C1067 RL outlet valve Code No. C105B RR outlet valve CAUTION If there is any problem in the CAN bus lines, an incorrect diagnosis code may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C − CAN Bus Diagnostics Table ). OPERATION • ABS-ECU contains the power supply circuit (+ BV terminal) for the solenoid valve. The solenoid valve is energised by the valve relay, which is incorporated in ABS-ECU. • The valve relay, which is incorporated in ABS-ECU, is always energising the solenoid valve unless the initial check is in progress when the ignition switch is turned on, and the recurrent system check is in progress. • ABS-ECU activates the solenoid valve by turning on its driving transistor. DIAGNOSIS CODE SET CONDITIONS These diagnosis codes will be set under the cases below: • The solenoid valve is not energized even after ABS-ECU has turned on the driving transistor (Open circuit is present in the power supply circuit to the ABS-ECU solenoid valve, or the valve relay has failed). • The solenoid valve is not energised even after ABS-ECU has turned on the driving transistor (Open circuit is present in the solenoid valve circuit in ABS-ECU, or the valve relay has failed). • After ABS-ECU has turned off the driving transistor, the solenoid valve still remains energized (short in the solenoid valve circuit). • When a solenoid valve failure is detected PROBABLE CAUSES • ABS-ECU malfunction ANTI-SKID BRAKING SYSTEM (ABS) TROUBLESHOOTING DIAGNOSIS PROCEDURE STEP 1. M.U.T.-III CAN bus diagnostics Use M.U.T.-III to diagnose the CAN bus lines. Q: Is the check result normal? YES : Go to Step 3. NO : Repair the CAN bus lines (Refer to GROUP 54C − CAN Bus Diagnostics Table ).On completion, go to Step 2. STEP 2. Diagnosis code recheck after resetting CAN bus lines Q: Is the relevant diagnosis code set? YES : Go to Step 3. NO : This diagnosis is complete. 35B-27 STEP 3. Check whether the diagnosis code is reset. Erase the diagnosis code. Q: Is the relevant diagnosis code set? YES : Replace the hydraulic unit (integrated with ABS-ECU) (Refer to P.35B-61). Then go to Step 4. NO : Intermittent malfunction (Refer to GROUP 00 − How to Use Troubleshooting/ How to Cope with Intermittent Malfunctions ). STEP 4. Check whether the diagnosis code is reset. Erase the diagnosis code. Q: Is the relevant diagnosis code set? YES : Return to Step 1. NO : This diagnosis is complete. Code No. C2104 Valve power supply circuit CAUTION If there is any problem in the CAN bus lines, an incorrect diagnosis code may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C − CAN Bus Diagnostics Table ). OPERATION • ABS-ECU contains the power supply circuit (+BV terminal) for the solenoid valve. The solenoid valve is energised by the valve relay, which is incorporated in ABS-ECU. • The valve relay, which is incorporated in ABS-ECU, is always energising the solenoid valve unless the initial check is in progress when the ignition switch is turned on, and the recurrent system check is in progress. DIAGNOSIS CODE SET CONDITIONS This diagnosis code will be set when the solenoid valve supply voltage is not within the standard value. PROBABLE CAUSES Current trouble • Fusible link malfunction • Damaged wiring harness and connectors • Abnormality in battery or alternator • ABS-ECU malfunction Past trouble • Carry out diagnosis with particular emphasis on wiring harness and connector failures between the power supply circuit (+BV terminal) to ABS-ECU solenoid valve or earth circuit (GND1, GND2 terminal). For diagnosis procedures, refer to How to treat past trouble (GROUP 00 − How to Use Troubleshooting/How to Treat Past Trouble ). DIAGNOSTIC PROCEDURE STEP 1. M.U.T.-III CAN bus diagnostics Use M.U.T.-III to diagnose the CAN bus lines. Q: Is the check result normal? YES : Go to Step 3. NO : Repair the CAN bus lines (Refer to GROUP 54C − CAN Bus Diagnostics Table ). On completion, go to Step 2. STEP 2. Diagnosis code recheck after resetting CAN bus lines Q: Is the diagnosis code No.C2104 set? YES : Go to Step 3. NO : This diagnosis is complete. STEP 3. Battery check Refer to GROUP 54A − Battery Test . YES : Go to Step 4. Q: Is the battery in good condition? NO : Replace the battery. Then go to Step 10. 35B-28 ANTI-SKID BRAKING SYSTEM (ABS) TROUBLESHOOTING STEP 4. Charging system check Refer to GROUP 16 − On−vehicle Service/Alternator Output Line Voltage Drop Test . Q: Is the charging system in good condition? YES : Go to Step 5. NO : Repair or replace the charging system component(s). Then go to Step 10. STEP 5. Fusible link check: Check the fusible link No.4 and SBF7. Visually check for open circuit in the fusible link No.4 and SBF7. Q: Is the check result normal? YES : Go to Step 7. NO : Go to Step 6. STEP 6. Resistance measurement at ABS-ECU connector (1) Disconnect the connector, and measure at the wiring harness side. (2) Disconnect the fusible link No.SBF7. (3) Resistance between the +BV terminal and the body earth. OK: No continuity Q: Is the check result normal? YES : Replace the fusible link No.4 or SBF7. Then go to Step 10. NO : The short circuit may be present in the power supply circuit. Repair the wiring harness between the ABS-ECU connector +BV terminal and the fusible link, and then replace the fusible link No.4 or SBF7. Then go to Step 10. STEP 7. Voltage measurement at the ABS-ECU connector (1) Disconnect the connector, and measure at the wiring harness side. (2) Measure the voltage between the +BV terminal and the body earth. OK: Approximately system voltage Q: Is the check result normal? YES : Go to Step 8. NO : The open circuit may be present in the power supply circuit. Repair the wiring harness between the ABS-ECU connector +BV terminal and the fusible link. Then go to Step 10. STEP 8. Resistance measurement at ABS-ECU connector (1) Disconnect the connector, and measure at the wiring harness side. (2) Resistance between the GND1 terminal and the body earth, and between the GND2 terminal and the body earth OK: Continuity exists (2 Ω or less) Q: Is the check result normal? YES : Go to Step 9. NO : An open circuit may be present in the earth circuit. Repair the wiring harness between the ABS-ECU connector GND1 terminal and the body earth, and between the ASC-ECU connector GND2 terminal and the body earth. Then go to Step 10. STEP 9. Check whether the diagnosis code is reset. Erase the diagnosis code. Q: Is the diagnosis code No.C2104 set? YES : Replace the hydraulic unit (integrated with ABS-ECU) (Refer to P.35B-61). Then go to Step 10. NO : Intermittent malfunction (Refer to GROUP 00 − How to Use Troubleshooting/ How to Cope with Intermittent Malfunctions ). STEP 10. Check whether the diagnosis code is reset. Erase the diagnosis code. Q: Is the diagnosis code No.C2104 set? YES : Return to Step 1. NO : This diagnosis is complete. ANTI-SKID BRAKING SYSTEM (ABS) TROUBLESHOOTING 35B-29 Code No. C1073 Motor drive circuit CAUTION If there is any problem in the CAN bus lines, an incorrect diagnosis code may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C − CAN Bus Diagnostics Table ). OPERATION • ABS-ECU contains the power supply circuit (+BM terminal) for the pump motor. The pump motor is energised by the motor switch, which is incorporated in ABS-ECU. • The pump motor switch, which is incorporated in ABS-ECU, is always off unless the ABS operating and the motor solenoid valve check is activated when the vehicle is started. • ABS-ECU activates the pump motor by turning on the ECU built-in pump motor switch. DIAGNOSIS CODE SET CONDITIONS If the pump motor switch voltage drop indicates high value when the pump motor operates or after the operation, the pump motor operation is stopped and this diagnosis code is set. PROBABLE CAUSES Current trouble • Fusible link malfunction • Damaged wiring harness and connectors • Abnormality in battery or alternator • ABS-ECU malfunction STEP 2. Check whether the diagnosis code is reset. Q: Is the diagnosis code No.C1073 set? YES : Go to Step 3. NO : This diagnosis is complete. STEP 3. Battery check Refer to GROUP 54A − Battery Test . Q: Is the battery in good condition? YES : Go to Step 4. NO : Replace the battery. Then go to Step 10. STEP 4. Charging system check Refer to GROUP 16 − On−vehicle Service/Alternator Output Line Voltage Drop Test . Q: Is the charging system in good condition? YES : Go to Step 5. NO : Repair or replace the charging system component(s). Then go to Step 10. STEP 5. Fusible link check: Check the fusible link No.4 and SBF5. Visually check for open circuit in the fusible link No.4 and SBF5. Q: Is the check result normal? YES : Go to Step 7. NO : Go to Step 6. Past trouble • Carry out diagnosis with particular emphasis on wiring harness and connector failures between the power supply circuit (+BM terminal) to the ABS-ECU motor and the earth circuit (GND1, GND2 terminal). For diagnosis procedures, refer to How to treat past trouble (GROUP 00 − How to Use Troubleshooting/How to Treat Past Trouble ). STEP 6. Resistance measurement at ABS-ECU connector (1) Disconnect the connector, and measure at the wiring harness side. (2) Resistance between the +BM terminal and the body earth. OK: No continuity DIAGNOSTIC PROCEDURE Q: Is the check result normal? YES : Replace the fusible link No.4 or SBF5. Then go to Step 10. STEP 1. M.U.T.-III CAN bus diagnostics Use M.U.T.-III to diagnose the CAN bus lines. Q: Is the check result normal? YES : Go to Step 3. NO : Repair the CAN bus lines (Refer to GROUP 54C − CAN Bus Diagnostics Table ). On completion, go to Step 2. NO : The short circuit may be present in the power supply circuit. Repair the wiring harness between the ABS-ECU connector +BM terminal and the fusible link, and then replace the fusible link No.4 or SBF5. Then go to Step 10. 35B-30 ANTI-SKID BRAKING SYSTEM (ABS) TROUBLESHOOTING STEP 7. Voltage measurement at the ABS-ECU connector (1) Disconnect the connector, and measure at the wiring harness side. (2) Measure the voltage between the +BM terminal and the body earth. OK: Approximately system voltage STEP 9. Check whether the diagnosis code is reset. (1) Erase the diagnosis code. (2) Drive the vehicle at 20 km/h or more. NOTE: The ABS warning lamp does not turn OFF in some cases unless the vehicle runs at 20 km/h or higher. Q: Is the check result normal? YES : Go to Step 8. NO : The open circuit may be present in the Q: Is the diagnosis code No.C1073 set? YES : Replace the hydraulic unit (integrated with power supply circuit. Repair the wiring harness between the ABS-ECU connector +BM terminal and the fusible link. Then go to Step 10. STEP 8. Resistance measurement at ABS-ECU connector (1) Disconnect the connector, and measure at the wiring harness side. (2) Resistance between the GND1 terminal and the body earth, and between the GND2 terminal and the body earth OK: Continuity exists (2 Ω or less) Q: Is the check result normal? YES : Go to Step 9. NO : An open circuit may be present in the earth ABS-ECU) (Refer to P.35B-61). Then go to Step 10. NO : Intermittent malfunction (Refer to GROUP 00 − How to Use Troubleshooting/How to Cope with Intermittent Malfunctions ). STEP 10. Check whether the diagnosis code is reset. (1) Erase the diagnosis code. (2) Drive the vehicle at 20 km/h or more. NOTE: The ABS warning lamp does not turn OFF in some cases unless the vehicle runs at 20 km/h or higher. Q: Is the diagnosis code No.C1073 set? YES : Return to Step 1. NO : This diagnosis is complete. circuit. Repair the wiring harness between the ABS-ECU connector GND1 terminal and the body earth, and between the ABS-ECU connector GND2 terminal and the body earth. Then go to Step 10. Code No. C2116 Pump motor voltage low CAUTION • If there is any problem in the CAN bus lines, an incorrect diagnosis code may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C − CAN Bus Diagnostics Table ). • Whenever ECU is replaced, ensure that the CAN bus lines are normal. OPERATION • ABS-ECU contains the power supply circuit (+BM terminal) for the pump motor. The pump motor is energised by the motor switch, which is incorporated in ABS-ECU. • The pump motor switch, which is incorporated in ABS-ECU, is always off unless the motor solenoid valve check is activated when the vehicle is started. • ABS-ECU activates the pump motor by turning on the ECU built-in pump motor switch. DIAGNOSIS CODE SET CONDITIONS This diagnosis codes will be set under the cases below: • When the power supply voltage of the pump motor, which is not in operation, is abnormally low for a prolonged period • When the power supply voltage of the pump motor, which is not in operation, is abnormally high for a prolonged period ANTI-SKID BRAKING SYSTEM (ABS) TROUBLESHOOTING PROBABLE CAUSES Current trouble • Fusible link malfunction • Damaged wiring harness and connectors • Abnormality in battery or alternator • ABS-ECU malfunction Past trouble • Carry out diagnosis with particular emphasis on wiring harness and connector failures between the power supply circuit (+BM terminal) to the ABS-ECU motor and the earth circuit (GND1, GND2 terminal). For diagnosis procedures, refer to How to treat past trouble (GROUP 00 − How to Use Troubleshooting/How to Treat Past Trouble ). DIAGNOSTIC PROCEDURE STEP 1. M.U.T.-III CAN bus diagnostics Use M.U.T.-III to diagnose the CAN bus lines. Q: Is the check result normal? YES : Go to Step 3. NO : Repair the CAN bus lines (Refer to GROUP 54C − CAN Bus Diagnostics Table ). On completion, go to Step 2. STEP 2. Diagnosis code recheck after resetting CAN bus lines Q: Is the diagnosis code No.C2116 set? YES : Go to Step 3. NO : This diagnosis is complete. STEP 3. Battery check Refer to GROUP 54A − Battery Test . Q: Is the battery in good condition? YES : Go to Step 4. NO : Replace the battery. Then go to Step 10. STEP 4. Charging system check Refer to GROUP 16 − On−vehicle Service/Alternator Output Line Voltage Drop Test . Q: Is the charging system in good condition? YES : Go to Step 5. NO : Repair or replace the charging system component(s). Then go to Step 10. 35B-31 STEP 5. Fusible link check: Check the fusible link No.4 and SFB5. Visually check for open circuit in the fusible link No.4 and SFB5. Q: Is the check result normal? YES : Go to Step 7. NO : Go to Step 6. STEP 6. Resistance measurement at ABS-ECU connector (1) Disconnect the connector, and measure at the wiring harness side. (2) Disconnect the fusible link No.4 or SFB5. (3) Resistance between the +BM terminal and the body earth. OK: No continuity Q: Is the check result normal? YES : Replace the fusible link No.4 or SFB5. Then go to Step 10. NO : The short circuit may be present in the power supply circuit. Repair the wiring harness between the ABS-ECU connector +BM terminal and the fusible link, and then replace the fusible link No.4 or SFB5. Then go to Step 10. STEP 7. Voltage measurement at the ABS-ECU connector (1) Disconnect the connector, and measure at the wiring harness side. (2) Measure the voltage between the +BM terminal and the body earth. OK: Approximately system voltage Q: Is the check result normal? YES : Go to Step 8. NO : The open circuit may be present in the power supply circuit. Repair the wiring harness between the ABS-ECU connector +BM terminal and the fusible link. Then go to Step 10. STEP 8. Resistance measurement at ABS-ECU connector (1) Disconnect the connector, and measure at the wiring harness side. (2) Resistance between the GND1 terminal and the body earth, and between the GND2 terminal and the body earth. OK: Continuity exists (2 Ω or less) Q: Is the check result normal? 35B-32 ANTI-SKID BRAKING SYSTEM (ABS) TROUBLESHOOTING YES : Go to Step 9. NO : An open circuit may be present in the earth circuit. Repair the wiring harness between the ABS-ECU connector GND1 terminal and the body earth, and between the ABS-ECU connector GND2 terminal and the body earth. Then go to Step 10. STEP 9. Check whether the diagnosis code is reset. (1) Erase the diagnosis code. (2) Drive the vehicle at 20 km/h or higher. NOTE: The ABS warning lamp does not turn OFF in some cases unless the vehicle runs at 20 km/h or higher. Q: Is the diagnosis code No.C2116 set? YES : Replace the hydraulic unit (integrated with ABS-ECU) (Refer to P.35B-61). Then go to Step 10. NO : Intermittent malfunction (Refer to GROUP 00 − How to Use Troubleshooting/ How to Cope with Intermittent Malfunctions ). STEP 10. Check whether the diagnosis code is reset. (1) Erase the diagnosis code. (2) Drive the vehicle at 20 km/h or higher. NOTE: The ABS warning lamp does not turn OFF in some cases unless the vehicle runs at 20 km/h or higher. Q: Is the diagnosis code No.C2116 set? YES : Return to Step 1. NO : This diagnosis is complete. Code No. C1000 Brake SW (stuck) CAUTION • If there is any problem in the CAN bus lines, an incorrect diagnosis code may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C − CAN Bus Diagnostics Table ). • Whenever ECU is replaced, ensure that the CAN bus lines are normal. DIAGNOSTIC PROCEDURE STEP 1. M.U.T.-III CAN bus diagnostics Use M.U.T.-III to diagnose the CAN bus lines. Q: Is the check result normal? YES : Go to Step 3. NO : Repair the CAN bus lines (Refer to GROUP 54C − CAN Bus Diagnostics Table ). On completion, go to Step 2. OPERATION ETACS-ECU sends the ON signal generated when the brake pedal is depressed and OFF signal generated when it is released to ABS-ECU via the CAN bus lines. DIAGNOSIS CODE SET CONDITIONS This diagnosis code is set in the following case. • When the vehicle has run for a long time with the stop lamp switch turned ON. • When the OFF status of the stop lamp switch does not match the vehicle attitude PROBABLE CAUSES • Damaged wiring harness and connectors • Improper adjustment of stop lamp switch installation position • Malfunction of the stop lamp switch • Malfunction of ETACS-ECU • ABS-ECU malfunction STEP 2. Diagnosis code recheck after resetting CAN bus lines Q: Is diagnosis code No.C1000 set? YES : Go to Step 3. NO : This diagnosis is complete. STEP 3. M.U.T.-III other system's data list Check the ETACS-ECU system data list. • The brake pedal is depressed. Item No. Item name Normal condition 290 Stop lamp switch OFF to ON Q: Is the check result normal? YES : Go to Step 4. NO : Refer to GROUP 54A − ETACS, Inspection Procedure 12 "The stop lamp switch signal is not received." ANTI-SKID BRAKING SYSTEM (ABS) TROUBLESHOOTING STEP 4. Diagnosis code recheck Erase the diagnosis code. STEP 5. Diagnosis code recheck Erase the diagnosis code. Q: Is diagnosis code No.C1000 set? YES : Replace the hydraulic unit (integrated with Q: Is diagnosis code No.C1000 set? YES : Return to Step 1. NO : This diagnosis is complete. ABS-ECU) (Refer to P.35B-61). Then go to Step 5. NO : Intermittent malfunction (Refer to GROUP 00 − How to Use Troubleshooting/How to Cope with Intermittent Malfunctions ). 35B-33 Code No. C2200 ECU internal error CAUTION • If there is any problem in the CAN bus lines, an incorrect diagnosis code may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C − CAN Bus Diagnostics Table ). • Whenever ECU is replaced, ensure that the CAN bus lines are normal. OPERATION ABS-ECU controls ABS by calculating the data sent from the wheel speed sensor and the G sensor. PROBABLE CAUSES ABS-ECU malfunction DIAGNOSTIC PROCEDURE Check whether the diagnosis code is reset. Erase the diagnosis code. Q: Is the diagnosis code No. C2200 set? YES : Replace the hydraulic unit (integrated with ABS-ECU) (Refer to P.35B-61). NO : This diagnosis is complete. DIAGNOSIS CODE SET CONDITIONS This diagnosis code is set when ABS-ECU has malfunction. Code No. C2101 Power supply high voltage CAUTION If there is any problem in the CAN bus lines, an incorrect diagnosis code may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C − CAN Bus Diagnostics Table ). OPERATION The ABS-ECU is energized by the valve power supply circuit (+BV terminal). When the power is supplied from the ignition switch (IG1) to the IG1 relay in ETACS-ECU, IG1 relay is turned on. At this time, the valve power supply circuit (IG1 terminal) energizes the ABS-ECU. DIAGNOSIS CODE SET CONDITIONS This diagnosis code is set when the ABS-ECU power supply voltage is more than 18.0 ± 1.0 V. PROBABLE CAUSES • Battery failure • ABS-ECU malfunction • Charging system failed DIAGNOSIS PROCEDURE STEP 1. M.U.T.-III CAN bus diagnosis Use M.U.T.-III to diagnose the CAN bus lines. Q: Is the check result normal? YES : Go to Step 3. NO : Repair the CAN bus lines (Refer to GROUP 54C − CAN Bus Diagnostics Table ). On completion, go to Step 2. STEP 2. Diagnosis code recheck after resetting CAN bus lines Q: Is diagnosis code No.C2101 set? YES : Go to Step 3. NO : This diagnosis is complete. 35B-34 ANTI-SKID BRAKING SYSTEM (ABS) TROUBLESHOOTING STEP 3. Battery check Refer to GROUP 54A − Battery Test . Q: Is the battery in good condition? YES : Go to Step 5. NO : Charge or replace the battery. Then go to Step 4. STEP 4. Charging system check Refer to GROUP 16 − On−vehicle Service/Alternator Output Line Voltage Drop Test . Q: Is the charging system in good condition? YES : Go to Step 5. NO : Repair or replace the charging system component(s). STEP 5. Check whether the diagnosis code is reset. Erase the diagnosis code. Q: Is diagnosis code No.C2101 set? YES : Replace the hydraulic unit (integrated with ABS-ECU) (Refer to P.35B-61). Then go to Step 6. NO : Intermittent malfunction (Refer to GROUP 00 − How to Use Troubleshooting/How to Cope with Intermittent Malfunctions ). STEP 6. Check whether the diagnosis code is reset. Erase the diagnosis code. Q: Is diagnosis code No.C2101 set? YES : Return to Step 1. NO : This diagnosis is complete. Code No. C1395 Incomplete Brake fluid filling CAUTION If there is any problem in the CAN bus lines, an incorrect diagnosis code may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C − CAN Bus Diagnostics Table ). DIAGNOSTIC PROCEDURE DIAGNOSIS CODE SET CONDITIONS Q: Is the check result normal? YES : Go to Step 2. NO : Repair the CAN bus lines (Refer to GROUP This diagnosis code is set when the brake fluid is not filled in the hydraulic unit. PROBABLE CAUSES • Different hydraulic unit (For delivery to factory) • ABS-ECU malfunction STEP 1. M.U.T.-III CAN bus diagnostics Use M.U.T.-III to diagnose the CAN bus lines. 54C − CAN Bus Diagnostics Table ). On completion, go to Step 2. STEP 2. Check whether the diagnosis code is reset. Erase the diagnosis code. Q: Is the diagnosis code No. C1395 set? YES : Replace the hydraulic unit (integrated with ABS-ECU) (Refer to P.35B-61). NO : This diagnosis is complete. Code No. C1210 Longitudinal G SNS.input circuit CAUTION If there is any problem in the CAN bus lines, an incorrect diagnosis code may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C − CAN Bus Diagnostics Table ). OPERATION • ABS-ECU monitors if the output of G sensor is normal or not. DIAGNOSIS CODE SET CONDITIONS This diagnosis code is set if any malfunction below is found: • When the output value of the G sensor is abnormal ANTI-SKID BRAKING SYSTEM (ABS) TROUBLESHOOTING PROBABLE CAUSES • ABS-ECU malfunction • External noise interference 35B-35 YES : Go to Step 4. NO : Replace the hydraulic unit (integrated with ABS-ECU) (Refer to P.35B-61). Then go to Step 5. DIAGNOSTIC PROCEDURE STEP 1. M.U.T.-III CAN bus diagnostics Use M.U.T.-III to diagnose the CAN bus lines. Q: Is the check result normal? YES : Go to Step 3. NO : Repair the CAN bus lines (Refer to GROUP 54C − CAN Bus Diagnostics Table ). On completion, go to Step 2. STEP 2. Diagnosis code recheck after resetting CAN bus lines Q: Is the diagnosis code No.C1210 set? YES : Go to Step 3. NO : The procedure is complete. STEP 4. Check whether the diagnosis code is reset. Erase the diagnosis code. Q: Is the diagnosis code No.C1210 set? YES : Replace the hydraulic unit (integrated with ABS-ECU) (Refer to P.35B-61). Then go to Step 5. NO : Intermittent malfunction (Refer to GROUP 00 − How to Use Troubleshooting/How to Cope with Intermittent Malfunctions ). STEP 5. Check whether the diagnosis code is reset. Q: Is the diagnosis code No.C1210 set? YES : Go to Step 1. NO : The procedure is complete. STEP 3. M.U.T.-III data list Check the following data list (Refer to P.35B-54). • Item 09: G sensor Q: Is the check result normal? Code No. C1242 Longitudinal G sensor signal CAUTION If there is any problem in the CAN bus lines, an incorrect diagnosis code may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C − CAN Bus Diagnostics Table ). DIAGNOSTIC PROCEDURE OPERATION Q: Is the check result normal? YES : Go to Step 3. NO : Repair the CAN bus lines (Refer to GROUP • ABS-ECU monitors if the output of G sensor is normal or not. DIAGNOSIS CODE SET CONDITIONS This diagnosis code is set when the abnormality is detected by comparing the G sensor value output from the G sensor with the value output from the wheel speed sensor. PROBABLE CAUSES • • • • • Improper installation of the G sensor Malfunction of wheel speed sensor ABS-ECU malfunction External noise interference When the vehicle is driven on a drum roller STEP 1. M.U.T.-III CAN bus diagnostics Use M.U.T.-III to diagnose the CAN bus lines. 54C − CAN Bus Diagnostics Table ). On completion, go to Step 2. STEP 2. Diagnosis code recheck after resetting CAN bus lines Q: Is the diagnosis code No.C1242 set? YES : Go to Step 3. NO : The procedure is complete. STEP 3. Check the wheel speed sensor-related diagnosis code. Use the M.U.T.-III to check whether the wheel speed sensor-related diagnosis code is set or not. Q: Is any diagnosis code set? 35B-36 ANTI-SKID BRAKING SYSTEM (ABS) TROUBLESHOOTING YES : Troubleshoot for the relevant diagnosis code (Refer to P.35B-11). NO : Go to Step 4. STEP 4. M.U.T.-III data list Check the following data list (Refer to P.35B-54). • Item 09: G sensor Q: Is the check result normal? YES : Go to Step 5. NO : Replace the hydraulic unit (integrated with ABS-ECU) (Refer to P.35B-61), and then go to Step 6. STEP 5. Check whether the diagnosis code is reset. (1) Erase the diagnosis code. (2) Drive the vehicle at 20 km/h or higher. NOTE: The ABS warning lamp does not turn OFF in some cases unless the vehicle runs at 20 km/h or higher. Q: Is the diagnosis code No.C1242 set? YES : Replace the hydraulic unit (integrated with ABS-ECU) (Refer to P.35B-61). Then go to Step 6. NO : Intermittent malfunction (Refer to GROUP 00 − How to Use Troubleshooting/How to Cope with Intermittent Malfunctions ). STEP 6. Check whether the diagnosis code is reset. (1) Erase the diagnosis code. (2) Drive the vehicle at 20 km/h or higher. NOTE: The ABS warning lamp does not turn OFF in some cases unless the vehicle runs at 20 km/h or higher. Q: Is the diagnosis code No.C1242 set? YES : Go to Step 1. NO : The procedure is complete. Code No. C123A: Sensor calibration Code No. C2002: Valve calibration not completed CAUTION • If there is any problem in the CAN bus lines, an incorrect diagnosis code may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C − CAN Bus Diagnostics Table ). • Whenever ECU is replaced, ensure that the CAN bus lines are normal. OPERATION ABS-ECU stores the calibrated value of the G sensor. DIAGNOSIS PROCEDURE STEP 1. M.U.T.-III CAN bus diagnostics Use M.U.T.-III to diagnose the CAN bus lines. Q: Is the check result normal? YES : Go to Step 3 NO : Repair the CAN bus lines (Refer to GROUP 54C − CAN Bus Diagnostics Table ). On completion, go to Step 2. DIAGNOSIS CODE SET CONDITIONS STEP 2. Diagnosis code recheck after resetting CAN bus lines This diagnosis code is set when the calibrated value for G sensor stored in ABS-ECU is not within the predetermined range. Q: Is diagnosis code No.C123A or C2002 set? YES : Go to Step 3 NO : This diagnosis is complete. PROBABLE CAUSES • Power supply is shut down while the calibrated value is being stored. • ABS-ECU malfunction STEP 4. Charging system check Refer to GROUP 16 − On−vehicle Service/Alternator Output Line Voltage Drop Test . STEP 3. Battery check Refer to GROUP 54A − Battery Test . Q: Is the battery in good condition? YES : Go to Step 5. NO : Go to Step 4. Q: Is the charging system in good condition? ANTI-SKID BRAKING SYSTEM (ABS) TROUBLESHOOTING YES : Replace the battery. Then go to Step 9. NO : Repair or replace the charging system component(s). STEP 5. Voltage measurement at the ABS-ECU connector (1) Disconnect the connector, and measure at the wiring harness side. (2) Measure the voltage between the +BV terminal and the body earth. OK: Approximately system voltage Q: Is the check result normal? YES : Go to Step 7. NO : Go to Step 6. STEP 6. Check of short to power supply, short to earth, and open circuit in +BV line between fusible link and ABS-ECU connector Q: Is the check result normal? YES : Go to Step 7. NO : Repair the fusible link, connector(s) or wiring harness. STEP 7. Resistance measurement at ABS-ECU connector (1) Disconnect the connector, and measure at the wiring harness side. (2) Resistance between the GND1 terminal and the body earth, and between the GND2 terminal and 35B-37 the body earth. OK: Continuity exists (2 Ω or less) Q: Is the check result normal? YES : Go to Step 9. NO : Go to Step 8. STEP 8. Check of open circuit in GND1, GND2 line between ABS-ECU connector and body earth Q: Is the check result normal? YES : Go to Step 9. NO : Repair the connector(s) or wiring harness. STEP 9. Check whether the diagnosis code is reset. Erase the diagnosis code. Q: Is diagnosis code No.C123A or C2002 set? NO : Replace the hydraulic unit (integrated with ABS-ECU) (Refer to P.35B-61), and then go to Step 10. NO : Intermittent malfunction (Refer to GROUP 00 − How to Use Troubleshooting/How to Cope with Intermittent Malfunctions ). STEP 10. Check whether the diagnosis code is reset. Erase the diagnosis code. Q: Is diagnosis code No.C123A or C2002 set? YES : Return to Step 1. NO : This diagnosis is complete. Code No. C1608 EEPROM fail CAUTION • If there is any problem in the CAN bus lines, an incorrect diagnosis code may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C − CAN Bus Diagnostics Table ). • If the ABS-ECU connector is disconnected or the battery terminal is disconnected when the ignition switch is ON, this diagnosis code may be set. • Since the failure information stored in the past is erased after this diagnosis is carried out, reproduce the state of malfunction. OPERATION The ABS-ECU stores diagnosis codes and failure information in the EEPROM*. The ABS-ECU is energized by the solenoid valve power supply circuit (+BV terminal). NOTE: *:EEPROM (Electrical Erasable and Programmable ROM) DIAGNOSIS CODE SET CONDITIONS • This diagnosis code is set when the failure information stored in the EEPROM is not reliable. The failure information stored in the past is not output, and only this diagnosis code is set. • This diagnosis code may occur when ABS-ECU power supply shutdown or drop between ABS-ECU is writing a data to the EEPROM. PROBABLE CAUSES • Disconnection of the ABS-ECU connector or the battery terminal when the ignition switch is ON • Loose battery terminal 35B-38 ANTI-SKID BRAKING SYSTEM (ABS) TROUBLESHOOTING • Abnormality in battery • Damaged wiring harness and connectors • ABS-ECU malfunction DIAGNOSTIC PROCEDURE STEP 1. M.U.T.-III CAN bus diagnostics Use M.U.T.-III to diagnose the CAN bus lines. Q: Is the check result normal? YES : Go to Step 3. NO : Repair the CAN bus lines (Refer to GROUP 54C − CAN Bus Diagnostics Table ). On completion, go to Step 2. STEP 2. Diagnosis code recheck after resetting CAN bus lines Q: Is the diagnosis code No.C1608 set? YES : Go to Step 3. NO : The procedure is complete. STEP 3. Battery check Refer to GROUP 54A − Battery Test . Q: Is the battery in good condition? YES : Go to Step 5. NO : Go to Step 4. STEP 4. Charging system check Refer to GROUP 16 − On−vehicle Service/Alternator Output Line Voltage Drop Test . Q: Is the charging system in good condition? YES : Replace the battery. Then go to Step 9. NO : Repair or replace the charging system component(s). STEP 5. Voltage measurement at the ABS-ECU connector (1) Disconnect the connector, and measure at the wiring harness side. (2) Measure the voltage between the +BV terminal and the body earth. OK: Approximately system voltage Q: Is the check result normal? YES : Go to Step 7. NO : Go to Step 6. STEP 6. Check of short to power supply, short to earth, and open circuit in +BV line between fusible link and ABS-ECU connector Q: Is the check result normal? YES : Go to Step 7. NO : Repair the fusible link, connector(s) or wiring harness. STEP 7. Resistance measurement at ABS-ECU connector (1) Disconnect the connector, and measure at the wiring harness side. (2) Resistance between the GND1 terminal and the body earth, and between the GND2 terminal and the body earth. OK: Continuity exists (2 Ω or less) Q: Is the check result normal? YES : Go to Step 9. NO : Go to Step 8. STEP 8. Check of open circuit in GND1, GND2 line between ABS-ECU connector and body earth Q: Is the check result normal? YES : Go to Step 9. NO : Repair the connector(s) or wiring harness. STEP 9. Check whether the diagnosis code is reset. (1) Erase the diagnosis code. (2) Turn the ignition switch to the "LOCK" (OFF) position. (3) Turn the ignition switch to the "ON" position. Q: Is diagnosis code No. C1608 set? YES : Replace the hydraulic unit (integrated with ABS-ECU) (Refer to P.35B-61). Then go to step 10. NO : Go to step 11. STEP 10. Check whether the diagnosis code is reset. Drive the vehicle at 20 km/h or higher. NOTE: The ABS warning lamp does not turn OFF in some cases unless the vehicle runs at 20 km/h or higher. Q: Is diagnosis code No. C1608 set? YES : Return to Step 1. NO : Go to step 11. STEP 11. Check the other diagnosis code. Drive the vehicle at 20 km/h or more. NOTE: The ABS warning lamp does not turn OFF in some cases unless the vehicle runs at 20 km/h or higher. Q: Is any diagnosis code set? ANTI-SKID BRAKING SYSTEM (ABS) TROUBLESHOOTING 35B-39 YES : Carry out the applicable troubleshooting for the diagnosis code (Refer to P.35B-11). NO : The procedure is complete. Code No.C1707: Implausible coding data CAUTION • If there is any problem in the CAN bus lines, an incorrect diagnosis code may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C − CAN Bus Diagnostics Table ). • Whenever ECU is replaced, ensure that the CAN bus lines are normal. • When diagnosis code No.C1707 is set in ABS-ECU, the diagnosis code may also be set in ETACS-ECU. When the diagnosis code is set in ETACS-ECU, carry out the diagnosis of the diagnosis code for ETACS-ECU first. OPERATION ABS-ECU receives the vehicle information stored in the ETACS-ECU via CAN bus lines. DIAGNOSIS CODE SET CONDITIONS When received unset coding data from the ETACS-ECU, this diagnosis code is set. PROBABLE CAUSES • Malfunction of ETACS-ECU • ETACS-ECUs have been interchanged between two vehicles. • ABS-ECU malfunction • ABS-ECUs have been interchanged between two vehicles. • Malfunction of ETACS-ECU coding data DIAGNOSTIC PROCEDURE STEP 1. M.U.T.-III CAN bus diagnostics Use M.U.T.-III to diagnose the CAN bus lines. Q: Is the check result normal? YES : Go to Step 3. NO : Repair the CAN bus lines (Refer to GROUP YES : Go to Step 3. NO : This diagnosis is complete. STEP 3. M.U.T.-III other system diagnosis code Use M.U.T.-III to check whether any coding-related diagnosis code is set by ETACS-ECU. Q: Is the diagnosis code set? YES : Troubleshoot for the relevant diagnosis code. NO : Go to Step 4. STEP 4. Check part number of ABS-ECU Check the part number of ABS-ECU. Q: Is the check result normal? YES : Go to Step 5. NO : Replace the hydraulic unit (integrated with ABS-ECU) (Refer to P.35B-61). Then go to Step 8. STEP 5. ETACS-ECU coding data check Refer to GROUP 00 − Coding List . Q: Is the check result normal? YES : Go to Step 6. NO : Replace the ETACS-ECU (Refer to GROUP 54A − ETACS-ECU ). STEP 6. Check part number of ETACS-ECU Check the part number of ETACS-ECU. Q: Is the check result normal? YES : Go to Step 7. NO : Replace the ETACS-ECU (Refer to GROUP 54A − ETACS-ECU ). STEP 2. Diagnosis code recheck after resetting CAN bus lines STEP 7. Check whether the diagnosis code is reset. (1) Erase the diagnosis code. (2) Turn the ignition switch to the "OFF" position. (3) Turn the ignition switch to the "ON" position. (4) Turn the ignition switch to the "OFF" position. (5) Turn the ignition switch to the "ON" position. (6) Check that the ABS warning lamp goes out. Q: Is diagnosis code No.C1707 set? Q: Is diagnosis code No.C1707 set? 54C − CAN Bus Diagnostics Table ). On completion, go to Step 2. 35B-40 ANTI-SKID BRAKING SYSTEM (ABS) TROUBLESHOOTING YES : Replace the hydraulic unit (integrated with ABS-ECU) (Refer to P.35B-61). Then go to Step 8. NO : The trouble can be an intermittent malfunction (Refer to GROUP 00 − How to Use Troubleshooting/How to Cope with Intermittent Malfunctions ). (2) (3) (4) (5) (6) Turn the ignition switch to the "OFF" position. Turn the ignition switch to the "ON" position. Turn the ignition switch to the "OFF" position. Turn the ignition switch to the "ON" position. Check that the ABS warning lamp goes out. Q: Is diagnosis code No.C1707 set? YES : Return to Step 1. NO : This diagnosis is complete. STEP 8. Check whether the diagnosis code is reset. (1) Erase the diagnosis code. Code No. C2204 Sensor cluster internal error CAUTION • If there is any problem in the CAN bus lines, an incorrect diagnosis code may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C − CAN Bus Diagnostics Table ). • Whenever ECU is replaced, ensure that the CAN bus lines are normal. NOTE: This diagnosis code may be set when G and yaw rate sensor is put on the turntable turning at high speed. PROBABLE CAUSES • ABS-ECU malfunction DIAGNOSTIC PROCEDURE OPERATION The ABS-ECU communicates with its integrated G sensor. Check whether the diagnosis code is reset. Erase the diagnosis code. DIAGNOSIS CODE SET CONDITIONS Q: Is the diagnosis code No. C2204 set? YES : Replace the hydraulic unit (integrated with This diagnosis code will be set when the ABS-ECU detects an defective G sensor. ABS-ECU) (Refer to P.35B-61). NO : This diagnosis is complete. Code No. U0114 4WD CAN timeout Code No. U0141 ETACS CAN timeout • • • • CAUTION If there is any problem in the CAN bus lines, an incorrect diagnosis code may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C − CAN Bus Diagnostics Table ). If diagnosis codes U0114 and U0141 are set in ABS-ECU, always diagnose the CAN bus line. If there is any fault in the CAN bus lines, an incorrect diagnosis code may be set. In this case, the set diagnosis code is not highly reliable. Whenever ECU is replaced, ensure that the CAN bus lines are normal. When the ETACS-ECU of vehicles without KOS is replaced, the encrypted code of the ignition key needs to be registered to the ETACS-ECU. (If the encrypted code is not registered, the engine cannot be started. Register the encrypted code as described in GROUP 54A, Immobilizer System − How to Register Key ID .) DIAGNOSIS CODE SET CONDITIONS This diagnosis code is set if ABS-ECU cannot receive the signal sent from other ECU for a certain period. OPERATION ABS-ECU communicates with the 4WD-ECU and ETACS-ECU via the CAN bus lines. ANTI-SKID BRAKING SYSTEM (ABS) TROUBLESHOOTING PROBABLE CAUSES Code No. U0114 • Wiring harness or connector failure of CAN bus line • 4WD-ECU malfunction • ABS-ECU malfunction Code No. U0141 • Wiring harness or connector failure of CAN bus line • ETACS-ECU malfunction • ABS-ECU malfunction DIAGNOSIS PROCEDURE STEP 1. M.U.T.-III CAN bus diagnosis Use M.U.T.-III to diagnose the CAN bus lines. Q: Is the check result normal? YES : Go to Step 2. NO : Repair the CAN bus lines (Refer to GROUP 54C − CAN Bus Diagnostics Table ). On completion, go to Step 4. STEP 2. Check whether the diagnosis code is reset. Q: Is Code No. U0114 or U0141 set? YES : Go to Step 3. NO : The procedure is complete. 35B-41 STEP 3. M.U.T.-III other system diagnosis code Use M.U.T.-III to check that other diagnosis code is set in the ECU corresponding to the relevant diagnosis. Q: Is other diagnosis code set? YES : Troubleshoot for the relevant diagnosis code. NO : Go to Step 4. STEP 4. M.U.T.-III diagnosis code Use M.U.T.-III to check if the same diagnosis code (time-out) is set in the other ECU. Q: Is any diagnosis code set? YES (Code No. U0114 is set) : Replace 4WD-ECU, and then go to Step 5. YES (Code No. U0141 is set) : Replace the ETACS-ECU, and then go to Step 5. NO (No diagnosis code is set.) : The procedure is complete. STEP 5. Check whether the diagnosis code is reset. Erase the diagnosis code. Q: Is Code No. U0114 or U0141 set? YES : Replace the hydraulic unit (integrated with ABS-ECU) (Refer to P.35B-61). NO : The procedure is complete. Code No. U1073 Bus-off CAUTION • If there is any problem in the CAN bus lines, an incorrect diagnosis code may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C − CAN Bus Diagnostics Table ). • If diagnosis code U1073 is set in ABS-ECU, always diagnose the CAN bus line. If there is any fault in the CAN bus lines, an incorrect diagnosis code may be set. In this case, the set diagnosis code is not highly reliable. • Whenever ECU is replaced, ensure that the CAN bus lines are normal. DIAGNOSIS CODE SET CONDITIONS This diagnosis code is set when ABS-ECU has ceased the CAN communication (bus off). COMMENTS ON TROUBLE SYMPTOM Malfunction of wiring harness, connector (s), or ABS-ECU may be present. PROBABLE CAUSES • Wiring harness or connector failure of CAN bus line • ABS-ECU malfunction • Other ECU malfunction DIAGNOSIS PROCEDURE STEP 1. M.U.T.-III CAN bus diagnosis Use M.U.T.-III to diagnose the CAN bus lines. Q: Is the check result normal? YES : Go to Step 2. NO : Repair the CAN bus lines (Refer to GROUP 54C − CAN Bus Diagnostics Table ). On completion, go to Step 3. 35B-42 ANTI-SKID BRAKING SYSTEM (ABS) TROUBLESHOOTING STEP 2. Check whether the diagnosis code is reset. Erase the diagnosis code. STEP 3. Check whether the diagnosis code is reset. Erase the diagnosis code. Q: Is diagnosis code No. U1073 set? YES : Replace the hydraulic unit (integrated with Q: Is diagnosis code No. U1073 set? YES : Return to Step 1. NO : This diagnosis is complete. ABS-ECU) (Refer to P.35B-61), and then go to Step 3. NO : If the trouble symptom is resolved, an intermittent malfunction such as poorly engaged connector(s) or wiring harness is suspected (Refer to GROUP 00 − How to Use Troubleshooting/How to Cope with Intermittent Malfunctions ). Code No. U1195 Coding not completed Code No. U1197 Coding data unavailable CAUTION • If there is any problem in the CAN bus lines, an incorrect diagnosis code may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C − CAN Bus Diagnostics Table ). • Whenever ECU is replaced, ensure that the CAN bus lines are normal. • When the diagnosis code U1195 or U1197 is set in ABS-ECU, the diagnosis code may also be set in ETACS-ECU. When the diagnosis code is set in ETACS-ECU, carry out the diagnosis of the diagnosis code for ETACS-ECU first. OPERATION ABS-ECU receives the vehicle information stored in the ETACS-ECU via CAN bus lines. DIAGNOSIS CODE SET CONDITIONS ABS-ECU communicates with ETACS-ECU via CAN bus lines. This diagnosis code No.U1195 is set when the variant coding for ETACS-ECU has not been implemented. This diagnosis code No.U1197 is set when there is difference between the vehicle information from the ETACS-ECU and the vehicle information stored in the ABS-ECU. PROBABLE CAUSES Code No.C1195 is set • Variant coding for ETACS-ECU has not been implemented. • ABS-ECU malfunction Code No.C1197 is set • Malfunction of ETACS-ECU • ETACS-ECU have been interchanged between two vehicles. • ABS-ECU malfunction • External noise interference • ABS-ECU have been interchanged between two vehicles. DIAGNOSTIC PROCEDURE STEP 1. M.U.T.-III CAN bus diagnostics Use M.U.T.-III to diagnose the CAN bus lines. Q: Is the check result normal? YES : Go to Step 3. NO : Repair the CAN bus lines (Refer to GROUP 54C − CAN Bus Diagnostics Table ). On completion, go to Step 2. STEP 2. Diagnosis code recheck after resetting CAN bus lines Q: Is the diagnosis code No. U1195 or U1197 set? YES : Go to Step 3. NO : The procedure is complete. STEP 3. M.U.T.-III other system diagnosis code Use M.U.T.-III to check whether the ETACS-ECU-related diagnosis code is set or not. Q: Is any diagnosis code set? ANTI-SKID BRAKING SYSTEM (ABS) 35B-43 TROUBLESHOOTING YES : Troubleshoot for the relevant diagnosis code. NO : Go to Step 4. STEP 4. Check ETACS coding data Refer to GROUP 00 − Coding List . Q: Is the check result normal? YES : Go to Step 6. NO : Go to Step 5. (2) (3) (4) (5) (6) Q: Is the diagnosis code No.U1195 or U1197 set? YES : Replace the hydraulic unit (ABS-ECU) (Refer to P.35B-61). Then go to Step 8. NO : The trouble can be an intermittent malfunction (Refer to GROUP 00 − How to Use Troubleshooting/How to Cope with Intermittent Malfunctions ). STEP 5. ETACS-ECU variant coding Perform the variant coding to the ETACS-ECU. Q: Dose variant coding succeed? YES : Go to Step 7. NO : Replace the ETACS-ECU (Refer to GROUP 54A − ETACS-ECU ), and then go to Step 7. STEP 6. Check part number of ABS-ECU Check the part number of ABS-ECU. Q: Is the check result normal? YES : Go to Step 7. NO : Replace the hydraulic unit (integrated with ABS-ECU) (Refer to P.35B-61). Then go to Step 8. Turn the ignition switch to the "OFF" position. Turn the ignition switch to the "ON" position. Turn the ignition switch to the "OFF" position. Turn the ignition switch to the "ON" position. Check that the ABS warning lamp goes out. STEP 8. Check whether the diagnosis code is reset. (1) Erase the diagnosis code. (2) Turn the ignition switch to the "OFF" position. (3) Turn the ignition switch to the "ON" position. (4) Turn the ignition switch to the "OFF" position. (5) Turn the ignition switch to the "ON" position. (6) Check that the ABS warning lamp goes out. Q: Is the diagnosis code No.U1195 or U1197 set? YES : Return to Step 1. NO : This diagnosis is complete. TROUBLE SYMPTOM CHART M1352011401667 STEP 7. Check whether the diagnosis code is reset. (1) Erase the diagnosis code. CAUTION • ABS may operate in the following conditions without hard braking: Slippery road surface, high-speed turn, and bumpy road surface. When asking the customers, confirm that they have/have not encountered ABS operation in corresponding conditions. • During ABS operation, the brake pedal is pulled forward gradually, and the noise occurs at the same time. This is because the brake line pressure varies intermittently to prevent the wheel lock, and not a system malfunction. • During diagnosis, a diagnosis code associated with other system may be set when the ignition switch is turned on with connector(s) disconnected. On completion, confirm all systems for diagnosis code(s). If diagnosis code(s) are set, erase them all. Trouble symptom Inspection procedure No. Reference page M.U.T.-III cannot communicate only with ABS-ECU. 1 P.35B-44 Brake warning lamp stays ON with the parking brake lever released. 2 P.35B-44 ABS warning lamp does not illuminate when ignition switch is turned to the ON position (Engine stopped). 3 P.35B-46 Brake warning lamp does not illuminate when the ignition switch is turned to ON position (Engine stopped). 4 P.35B-47 ABS warning lamp stays ON after the engine is started. 5 P.35B-48 35B-44 ANTI-SKID BRAKING SYSTEM (ABS) TROUBLESHOOTING Trouble symptom Inspection procedure No. Reference page Abnormality in brake operation 6 P.35B-49 ABS system inoperative 7 P.35B-50 ABS-ECU power supply circuit system 8 P.35B-51 ABS operate too frequently. 9 P.35B-53 The initial check sound of hydraulic unit is loud 10 P.35B-54 SYMPTOM PROCEDURES Inspection Procedure 1: M.U.T.-III cannot communication only with ABS-ECU. CAUTION • If there is any problem in the CAN bus lines, an incorrect diagnosis code may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C − CAN Bus Diagnostics Table ). • Whenever ECU is replaced, ensure that the CAN bus lines are normal. • If the power is supplied with the earth circuit of CAN communication device open circuited, an electric potential abnormality may occur to the CAN bus lines. COMMENTS ON TROUBLE SYMPTOM When M.U.T.-III cannot communicate with the ABS system, the CAN bus line, ABS-ECU power supply circuit system, or ABS-ECU may be faulty. PROBABLE CAUSES • • • • • • Damaged wiring harness and connectors ABS-ECU malfunction Wrong routing of M.U.T.-III harness Abnormality in battery or alternator Abnormality in power supply voltage to ABS-ECU ECU malfunction of other system DIAGNOSTIC PROCEDURE STEP 1. M.U.T.-III CAN bus diagnostics Use M.U.T.-III to diagnose the CAN bus lines. Q: Is the check result normal? YES : Check the power supply circuit, and repair if necessary (Refer to P.35B-51). NO : Repair the CAN bus lines (Refer to GROUP 54C − CAN Bus Diagnostics Table ). Inspection Procedure 2: Brake warning lamp stays ON with the parking brake lever released. CAUTION • If there is any problem in the CAN bus lines, an incorrect diagnosis code may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C − CAN Bus Diagnostics Table ). • Whenever ECU is replaced, ensure that the CAN bus lines are normal. OPERATION • When the parking brake switch is turned ON, the combination meter (BRK terminal) is earthed, and then the brake warning lamp illuminates. • When reduction of the brake fluid amount is detected, the brake fluid level switch is turned from ON to OFF. ETACS-ECU monitors the brake fluid level switch, and instructs the combination meter via the CAN bus line to illuminate the brake warning lamp. COMMENTS ON TROUBLE SYMPTOM This may be caused by earth fault in the parking brake switch circuit. PROBABLE CAUSES • The brake pad thickness is at the limit value or less. ANTI-SKID BRAKING SYSTEM (ABS) TROUBLESHOOTING • The brake fluid amount is at the "LOWER" level or lower. • Poor adjustment of the parking brake lever • Damaged wiring harness and connectors • Parking brake switch malfunction • Brake fluid level switch malfunction • Combination meter malfunction • ETACS-ECU malfunction DIAGNOSTIC PROCEDURE STEP 1. M.U.T.-III CAN bus diagnostics Use M.U.T.-III to diagnose the CAN bus lines. Q: Is the check result normal? YES : Go to Step 2. NO : Repair the CAN bus lines (Refer to GROUP 54C − CAN Bus Diagnostics Table ). STEP 2. M.U.T.-III diagnosis code for other systems. Use M.U.T.-III to check that the diagnosis code is set in the combination meter and ETACS-ECU. Q: Is the diagnosis code set? YES : Carry out the diagnosis for the diagnosis code. 35B-45 YES : Go to Step 10. NO : Go to Step 6. STEP 6. Brake fluid level switch check Refer to GROUP 35A − On-vehicle Service/Brake Fluid Level Switch Check . Q: Is the check result normal? YES : Go to Step 7. NO : Replace the reservoir tank assembly (Refer to GROUP 35A − Master Cylinder Assembly and Brake Booster ). Then go to Step 14. STEP 7. Resistance measurement at brake fluid level switch connector. (1) Disconnect the connector, and measure at the wiring harness side. (2) Measure the resistance between the brake fluid level switch connector (earth terminal) and the body earth. OK: Continuity exists (2 Ω or less) Q: Is the check result normal? YES : Go to Step 9. NO : Go to Step 8. STEP 8. Check of open circuit in earth line between brake fluid level switch connector and the body earth NO : Go to Step 3. STEP 3. Brake fluid level check Check that the brake fluid is filled up to the "MIN" level or higher. Q: Is the check result normal? YES : Go to Step 5. NO : Go to Step 4. STEP 4. Brake pad check Refer to GROUP 35A − On-vehicle Service/Brake Pad Check . Q: Is the check result normal? YES : Fill the brake fluid up to the "MAX" level. Q: Is the check result normal? YES : Go to Step 9. NO : Repair the connector(s) or wiring harness. STEP 9. Check of short to power supply, short to earth, and open circuit in HL1+ line between ETACS-ECU connector and brake fluid level switch connector Q: Is the check result normal? YES : Replace the ETACS-ECU (Refer to GROUP 54A − ETACS-ECU ). Then go to Step 14. NO : Repair the connector(s) or wiring harness. Then go to Step 5. NO : Replace the brake pad (Refer to GROUP 35A − On-vehicle Service/Brake Pad Replacement ). Then go to Step 14. STEP 5. M.U.T.-III data list for other system Check the ETACS-ECU system data list. Item No. Item name Normal condition 279 Brake fluid switch ON Q: Is the check result normal? STEP 10. Parking brake lever stroke check Refer to GROUP 36 − On-vehicle Service/Parking Brake Lever Stroke Check and Adjustment . Q: Is the check result normal? YES : Go to Step 11. NO : Adjust the parking brake lever stroke (Refer to GROUP 36 − On-vehicle Service/Parking Brake Lever Stroke Check and Adjustment ). Then go to Step 14. 35B-46 ANTI-SKID BRAKING SYSTEM (ABS) TROUBLESHOOTING STEP 11. Parking brake switch check Refer to GROUP 36 − On-vehicle Service/Parking Brake Switch Check . Q: Is the check result normal? YES : Go to Step 12. NO : Replace the parking brake switch (Refer to GROUP 36 − Parking Brake Lever ). Then go to Step 14. STEP 12. Check of short to power supply, short to earth, and open circuit in BRK line between combination meter connector and parking brake switch connector Q: Is the check result normal? YES : Go to Step 13. NO : Repair the connector(s) or wiring harness. STEP 13. Retest the system. Q: Does the brake warning lamp turn ON and OFF normally according to the parking brake lever operation? YES : Intermittent malfunction (Refer to GROUP 00 − How to Use Troubleshooting/How to Cope with Intermittent Malfunctions ). NO : Replace the combination meter assembly (Refer to GROUP 54A − Combination Meter ). Then go to Step 14. STEP 14. Retest the system. Q: Does the brake warning lamp turn ON and OFF normally according to the parking brake lever operation? YES : This diagnosis is complete. NO : Return to Step 1. Inspection Procedure 3: ABS warning lamp does not illuminate when ignition switch is turned to the ON position (engine stopped). CAUTION • If there is any problem in the CAN bus lines, an incorrect diagnosis code may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C − CAN Bus Diagnostics Table ). • Before replacing the ECU, ensure that the communication circuit is normal. OPERATION • ABS-ECU sends the illumination request signal of the ABS warning lamp to the combination meter through ETACS-ECU via CAN communication. • ABS-ECU illuminates the ABS warning lamp via ETACS-ECU for approximately 3 seconds for valve check with the ignition switch turned to the ON position. DIAGNOSTIC PROCEDURE STEP 1. M.U.T.-III CAN bus diagnostics Use M.U.T.-III to diagnose the CAN bus lines. Q: Is the check result normal? YES : Go to Step 2. NO : Repair the CAN bus lines (Refer to GROUP 54C − CAN Bus Diagnostics Table ). Then go to Step 9. STEP 2. M.U.T.-III diagnosis code Use M.U.T.-III to check the diagnosis code for the ABS system. Q: Is the diagnosis code set? YES : Carry out the diagnosis for the diagnosis code (Refer to P.35B-11). COMMENTS ON TROUBLE SYMPTOM This may be caused by faults in the CAN bus line, ETACS-ECU, combination meter or ABS-ECU. PROBABLE CAUSES • • • • • Damaged wiring harness and connectors ETACS-ECU malfunction Combination meter malfunction ABS-ECU malfunction Malfunction of coding data for ETACS-ECU NO : Go to Step 3. STEP 3. M.U.T.-III Special Function for other system Perform the following special function by the combination meter system, and check if the ABS warning lamp illuminates (Refer to GROUP 54A − Combination Meter ). • Item 6: Indicator (AUTO) Q: Is the check result normal? YES : Go to Step 4. NO : Replace the combination meter. ANTI-SKID BRAKING SYSTEM (ABS) TROUBLESHOOTING 35B-47 STEP 4. ETACS-ECU coding data check Use M.U.T.-III to check if coding data stored in ETACS-ECU is normal (Refer to GROUP 00 − Precautions before Service/Coding List ). STEP 7. M.U.T.-III diagnosis code for other systems Using M.U.T.-III, check that diagnosis code No. U0121 is not set by the ETACS system. Q: Is the check result normal? YES : Go to Step 6. NO : Go to Step 5. Q: Is the diagnosis code set? YES : Perform troubleshooting on ETACS-ECU (Refer to GROUP 54A − ETACS/Troubleshooting ). Then go to Step 9. NO : Go to Step 8. STEP 5. ETACS-ECU coding data check Perform the variant coding to the ETACS-ECU. Q: Is the check result normal? YES : Go to Step 9. NO : Replace the ETACS-ECU (Refer to GROUP 54A − ETACS-ECU ), and then go to Step 9. STEP 8. Retest the system. Q: Does the ABS warning lamp turn ON and OFF normally? YES : Intermittent malfunction (Refer to GROUP 00 − How to Use Troubleshooting/How to Cope with Intermittent Malfunctions ). NO : Replace the hydraulic unit (integrated with ABS-ECU) (Refer to P.35B-61). Then go to Step 9. STEP 6. M.U.T.-III diagnosis code for other systems Using M.U.T.-III, check that diagnosis code No.U0141 is not set by the combination meter system. Q: Is the diagnosis code set? YES : Diagnose the combination meter (Refer to GROUP 54A − Combination Meter/Troubleshooting ). Then go to Step 9. NO : Go to Step 7. STEP 9. Retest the system. Q: Does the ABS warning lamp turn ON and OFF normally? YES : This diagnosis is complete. NO : Return to Step 1. Inspection Procedure 4: Brake warning lamp does not illuminate when the ignition switch is turned to ON position (Engine stopped). CAUTION • If there is any problem in the CAN bus lines, an incorrect diagnosis code may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C − CAN Bus Diagnostics Table ). • Before replacing the ECU, ensure that the communication circuit is normal. OPERATION • ABS-ECU sends the illumination request signal of the break warning lamp to the combination meter through ETACS-ECU via the CAN communication. • ABS-ECU illuminates brake warning lamp via ETACS-ECU for approximately 3 seconds for bulb check with the ignition switch turned to the ON position. COMMENTS ON TROUBLE SYMPTOM This may be caused by faults in the CAN bus line, ETACS-ECU, combination meter or ABS-ECU. PROBABLE CAUSES • • • • Damaged wiring harness and connectors Malfunction of ETACS-ECU Malfunction of combination meter Malfunction of ABS-ECU DIAGNOSTIC PROCEDURE STEP 1. M.U.T.-III CAN bus diagnostics Use M.U.T.-III to diagnose the CAN bus lines. Q: Is the check result normal? YES : Go to Step 2. NO : Repair the CAN bus lines (Refer to GROUP 54C − CAN Bus Diagnostics Table ). Then go to Step 7. 35B-48 ANTI-SKID BRAKING SYSTEM (ABS) TROUBLESHOOTING STEP 2. M.U.T.-III diagnosis code Use M.U.T.-III to check the diagnosis code for the ABS system. Q: Is the diagnosis code set? YES : Carry out the diagnosis for the diagnosis code (Refer to P.35B-11). NO : Go to Step 3. STEP 3. M.U.T.-III Special Function for other system Perform the following special function by the combination meter system, and check if the ABS warning lamp illuminates (Refer to GROUP 54A − Combination Meter ). • Item 6: Indicator (AUTO) Q: Is the check result normal? YES : Go to Step 4. NO : Replace the combination meter. STEP 4. M.U.T.-III diagnosis code for other systems Using M.U.T.-III, check that diagnosis code No.U0141 is not set by the combination meter system. Q: Is the diagnosis code set? YES : Diagnose the combination meter (Refer to STEP 5. M.U.T.-III diagnosis code for other systems Using M.U.T.-III, check that diagnosis code No. U0121 is not set by the ETACS system. Q: Is the diagnosis code set? YES : Perform troubleshooting on ETACS-ECU (Refer to GROUP 54A − ETACS/Troubleshooting ). Then go to Step 7. NO : Go to Step 6. STEP 6. Retest the system. Q: Does the brake warning lamp turn ON and OFF normally? YES : Intermittent malfunction (Refer to GROUP 00 − How to Use Troubleshooting/How to Cope with Intermittent Malfunctions ). NO : Replace the hydraulic unit (integrated with ABS-ECU) (Refer to P.35B-61). Then go to Step 7. STEP 7. Retest the system. Q: Does the brake warning lamp turn ON and OFF normally? YES : This diagnosis is complete. NO : Return to Step 1. GROUP 54A − Combination Meter/Troubleshooting ). Then go to Step 7. NO : Go to Step 5. Inspection Procedure 5: ABS warning lamp stays ON after the engine is started. CAUTION • If there is any problem in the CAN bus lines, an incorrect diagnosis code may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C − CAN Bus Diagnostics Table ). • Whenever ECU is replaced, ensure that the CAN bus lines are normal. OPERATION • ABS-ECU sends the illumination request signal of the ABS warning lamp to the combination meter through ETACS-ECU via CAN communication. • ABS-ECU illuminates the ABS warning lamp via ETACS-ECU for approximately 3 seconds for valve check with the ignition switch turned to the ON position. COMMENTS ON TROUBLE SYMPTOM This may be caused by faults in the CAN bus line, ETACS-ECU, combination meter or ABS-ECU. PROBABLE CAUSES • Damaged wiring harness and connectors • Malfunction of ETACS-ECU • Malfunction of combination meter • Malfunction of ABS-ECU NOTE: Due to the abnormality in the supply voltage, the diagnosis code may not be set even when the ABS warning lamp is illuminated. ANTI-SKID BRAKING SYSTEM (ABS) TROUBLESHOOTING DIAGNOSTIC PROCEDURE STEP 1. M.U.T.-III CAN bus diagnostics Use M.U.T.-III to diagnose the CAN bus lines. Q: Is the check result normal? YES : Go to Step 2. NO : Repair the CAN bus lines (Refer to GROUP 54C − CAN Bus Diagnostics Table ). Then go to Step 7. STEP 2. M.U.T.-III diagnosis code Use M.U.T.-III to check the diagnosis code for the ABS system. Q: Is the diagnosis code set? YES : Carry out the diagnosis for the diagnosis code (Refer to P.35B-11). NO : Go to Step 3. STEP 3. Check the ABS-ECU power supply circuit system. Refer to P.35B-51. Q: Is the check result normal? YES : Go to Step 4. NO : Carry out the diagnosis of ABS-ECU power supply circuit system (Refer to P.35B-51). STEP 4. M.U.T.-III diagnosis code for other systems Using M.U.T.-III, check that diagnosis code No.U0141 is not set by the combination meter system. Q: Is the diagnosis code set? 35B-49 YES : Diagnose the combination meter (Refer to GROUP 54A − Combination Meter/Troubleshooting ). Then go to Step 7. NO : Go to Step 5. STEP 5. M.U.T.-III diagnosis code for other systems Using M.U.T.-III, check that diagnosis code No.U0121 is not set by the ETACS system. Q: Is the diagnosis code set? YES : Perform troubleshooting on ETACS-ECU (Refer to GROUP 54A − ETACS/Troubleshooting ). Then go to Step 7. NO : Go to Step 6. STEP 6. Retest the system. Drive the vehicle more at 10 km/h or high. Q: Does the ABS warning lamp turn ON and OFF normally? YES : Intermittent malfunction (Refer to GROUP 00 − How to Use Troubleshooting/How to Cope with Intermittent Malfunctions ). NO : Replace the hydraulic unit (integrated with ABS-ECU) (Refer to P.35B-61). Then go to Step 7. STEP 7. Retest the system. Drive the vehicle more at 10 km/h or high. Q: Does the ABS warning lamp turn ON and OFF normally? YES : This diagnosis is complete. NO : Return to Step 1. Inspection Procedure 6: Abnormality in brake operation CAUTION • If there is any problem in the CAN bus lines, an incorrect diagnosis code may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C − CAN Bus Diagnostics Table ). • Whenever ECU is replaced, ensure that the CAN bus lines are normal. COMMENTS ON TROUBLE SYMPTOM Although the cause of the trouble cannot be clearly resolved since it depends on the running status and road surface condition, the malfunction of the hydraulic circuit may occur if any diagnosis code is not detected. PROBABLE CAUSES • Malfunction of hydraulic unit (integrated with ABS-ECU) • Malfunction of hydraulic circuit • Malfunction of brake assembly • Malfunction of brake booster • Malfunction of master cylinder assembly DIAGNOSTIC PROCEDURE STEP 1. M.U.T.-III CAN bus diagnosis Use M.U.T.-III to diagnose the CAN bus lines. Q: Is the check result normal? 35B-50 ANTI-SKID BRAKING SYSTEM (ABS) TROUBLESHOOTING YES : Go to Step 2. NO : Repair the CAN bus lines (Refer to GROUP 54C − CAN Bus Diagnostics Table ). On completion, go to Step 2. STEP 2. Diagnosis code check Use M.U.T.-III to check the diagnosis code for the ABS system (Refer to P.35B-11). Q: Is the check result normal? YES : Go to Step 3. NO : Carry out the diagnosis for the diagnosis code chart (Refer to P.35B-11). STEP 4. Brake operation check Perform the following checks. • Brake pedal check (Refer to GROUP 35A − On-vehicle Service/Brake Pedal Check ). • Brake booster check (Refer to GROUP 35A − On-vehicle Service/Brake Booster Operation Check ). • Check valve check (Refer to GROUP 35A − On-vehicle Service/Check Valve Operation Check ). Q: Can any fault be found with the brake operation? YES : Check the brake-related parts, and repair if necessary. Then, go to Step 5. STEP 3. Hydraulic unit (integrated with ABS-ECU) check Check that the brake tube is correctly mounted to the hydraulic unit (integrated with ABS-ECU) (Refer to P.35B-61). Q: Is the check result normal? YES : Go to Step 4. NO : Connect the brake tubes correctly, and repair or replace the external brake lines of the hydraulic unit (integrated with ABS-ECU). NO : Go to Step 5. STEP 5. Hydraulic unit check Perform the following actuator tests (Refer to P.35B-55). • Item No.01: FL wheel ABS • Item No.02: FR wheel ABS • Item No.03: RL wheel ABS • Item No.04: RR wheel ABS Q: Is the check result normal? YES : This diagnosis is complete. NO : Replace the hydraulic unit (integrated with ABS-ECU) (Refer to P.35B-61). Inspection Procedure 7: ABS system inoperative CAUTION • If there is any problem in the CAN bus lines, an incorrect diagnosis code may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C − CAN Bus Diagnostics Table ). • Whenever ECU is replaced, ensure that the CAN bus lines are normal. COMMENTS ON TROUBLE SYMPTOM In case of this trouble symptom, ABS system operation may be disabled. Diagnosis code may be set by the ABS system using M.U.T.-III. PROBABLE CAUSES • Low battery voltage • Wiring harness or connector failure of CAN bus line • The ABS-ECU is defective. • Different ETACS-ECU, abnormal variant coding information DIAGNOSTIC PROCEDURE STEP 1. M.U.T.-III CAN bus diagnostics Use M.U.T.-III to diagnose the CAN bus lines. Q: Is the check result normal? YES : Go to Step 2. NO : Repair the CAN bus lines (Refer to GROUP 54C − CAN Bus Diagnostics Table ). On completion, go to Step 2. STEP 2. Diagnosis code check Use M.U.T.-III to check the diagnosis code for the ABS system. (Refer to P.35B-11.) Q: Is the check result normal? YES : Go to Step 3. NO : Carry out the diagnosis for the diagnosis code chart (Refer to P.35B-11). Then go to Step 7. ANTI-SKID BRAKING SYSTEM (ABS) TROUBLESHOOTING STEP 3. Check the ABS-ECU power supply circuit. Refer to P.35B-51. 35B-51 STEP 5. Operation check Q: Does the ABS work normally? YES : Intermittent malfunction (Refer to GROUP 00 − How to Use Troubleshooting/How to Cope with Intermittent Malfunctions ). NO : Check the brake system related components except ABS. Then go to Step 6. Q: Is the check result normal? YES : Go to Step 4. NO : Carry out the diagnosis of ABS-ECU power supply circuit system (Refer to P.35B-51). Then go to Step 7. STEP 6. Operation check STEP 4. Hydraulic unit (integrated with ABS-ECU) check Check that the brake tube is correctly mounted to the hydraulic unit (integrated with ABS-ECU) (Refer to P.35B-61). Q: Is the check result normal? YES : Go to Step 5. NO : Connect the brake tube correctly. Then go to Step 7. Q: Does the ABS work normally? YES : This diagnosis is complete. NO : Replace the hydraulic unit (integrated with ABS-ECU) (Refer to P.35B-61). Then go to Step 7. STEP 7. Operation check Q: Does the ABS warning lamp turn ON and OFF normally? YES : This diagnosis is complete. NO : Return to Step 1. Inspection Procedure 8: ABS-ECU power supply circuit system CAUTION • When the ABS-ECU power supply voltage becomes 9.7 ± 0.3 V or less, the ABS warning lamp illuminate, and the ABS control is prohibited. • If the battery terminal is not tightened properly, a dump surge may occur and the power supply voltage may become abnormally high for a short time. OPERATION • ABS-ECU contains the power supply circuit (+BV terminal) for the solenoid valve. The solenoid valve is energised by the valve relay, which is incorporated in ABS-ECU. • ABS-ECU contains the power supply circuit (+BM terminal) for the pump motor. The pump motor is energised by the motor relay, which is incorporated in ABS-ECU. • ABS-ECU contains the power supply circuit (IG1 terminal) for ABS-ECU. When the ignition switch (IG1) is turned ON, the voltage is applied to the relay incorporated in ETACS-ECU to turn ON the relay, and the power is supplied from fusible link through multi-purpose fuse. • When malfunction occurs in ABS-ECU power supply, the communication with M.U.T.-III becomes unavailable. PROBABLE CAUSES • • • • • • • Damaged wiring harness and connectors Malfunction of fuse and fusible link Improper tightening of battery terminal Improper tightening of earth bolt Battery failure Charging system failed Malfunction of ABS-ECU DIAGNOSTIC PROCEDURE STEP 1. Battery check Refer to GROUP 54A − Battery Test . Q: Is the battery in good condition? YES : Go to Step 3. NO : Charge or replace the battery. Then go to Step 2. STEP 2. Charging system check Refer to GROUP 16 − On−vehicle Service/Alternator Output Line Voltage Drop Test . Q: Is the charging system in good condition? YES : Go to Step 3. NO : Repair or replace the charging system component(s). 35B-52 ANTI-SKID BRAKING SYSTEM (ABS) TROUBLESHOOTING STEP 3. M.U.T.-III other system diagnosis code Check if diagnosis code is set to the ETACS-ECU. Q: Is the diagnosis code set? YES : Troubleshoot the ETACS. Refer to GROUP 54A - ETACS . NO : Go to Step 4. STEP 4. Voltage measurement at the ABS-ECU connector (1) Disconnect the connector, and measure at the wiring harness side. (2) Measure the voltage between ABS-ECU (+BV terminal) and body earth. OK: Approximately system voltage Q: Is the check result normal? YES : Go to Step 6. NO : Go to Step 5. STEP 5. Check of short to power supply, short to earth, and open circuit in +BV line between fusible link and ABS-ECU connector Q: Is the check result normal? YES : Intermittent malfunction is suspected (Refer to GROUP 00 − How to Use Troubleshooting/Inspection Service Points − How to Cope with Intermittent Malfunction ). NO : Repair the fusible link, connector(s) or wiring harness. Then go to Step 13. STEP 6. Voltage measurement at the ABS-ECU connector (1) Disconnect the connector, and measure at the wiring harness side. (2) Measure the voltage between ABS-ECU (+BM terminal) and body earth. OK: Approximately system voltage Q: Is the check result normal? YES : Go to Step 8. NO : Go to Step 7. STEP 7. Check of short to power supply, short to earth, and open circuit in +BM line between fusible link and ABS-ECU connector Q: Is the check result normal? YES : Intermittent malfunction is suspected (Refer to GROUP 00 − How to Use Troubleshooting/Inspection Service Points − How to Cope with Intermittent Malfunction ). NO : Repair the fusible link, connector(s) or wiring harness. Then go to Step 13. STEP 8. Voltage measurement at the ABS-ECU connector. (1) Disconnect the connector, and measure at the wiring harness side. (2) Turn the ignition switch to the ON position. (3) Measure the voltage between ABS-ECU (IG1 terminal) and body earth. OK: Approximately system voltage Q: Is the check result normal? YES : Go to Step 10. NO : Go to Step 9. STEP 9. Check of short to power supply, short to earth, and open circuit in IG1 line between ETACS-ECU and ABS-ECU connector Q: Is the check result normal? YES : Intermittent malfunction is suspected (Refer to GROUP 00 − How to Use Troubleshooting/Inspection Service Points − How to Cope with Intermittent Malfunction ). NO : Repair the connector(s) or wiring harness. Then go to Step 13. STEP 10. Resistance measurement at ABS-ECU connector (1) Disconnect the connector, and measure at the wiring harness side. (2) Resistance between the ABS-ECU (GND1 terminal) and the body earth, and between the ABS-ECU (GND2 terminal) and the body earth OK: Continuity exists (2 Ω or less) Q: Is the check result normal? YES : Go to Step 12. NO : Go to Step 11. STEP 11. Check of open circuit in GND1, GND2 line between ABS-ECU connector and body earth Q: Is the check result normal? YES : Intermittent malfunction is suspected (Refer to GROUP 00 − How to Use Troubleshooting/Inspection Service Points − How to Cope with Intermittent Malfunction ). NO : Repair the connector(s) or wiring harness. Then go to Step 13. STEP 12. Retest the system. Q: Is the communication with M.U.T.-III possible? ANTI-SKID BRAKING SYSTEM (ABS) TROUBLESHOOTING YES : Intermittent malfunction (Refer to GROUP 00 − How to Use Troubleshooting/How to Cope with Intermittent Malfunctions ). NO : Replace the hydraulic unit (integrated with ABS-ECU) (Refer to P.35B-61). Then go to Step 13. 35B-53 STEP 13. Retest the system. Q: Is the communication with M.U.T.-III possible? YES : Return to Step 1. NO : This diagnosis is complete. INSPECTION PROCEDURE 9: ABS operates too frequently. CAUTION Whenever ECU is replaced, ensure that the CAN bus lines are normal. COMMENTS ON TROUBLE SYMPTOM • Although the cause of the trouble cannot be clearly resolved since it depends on the running status and road surface condition, the malfunction of the hydraulic circuit may occur if any diagnosis code is not detected. • If wheels and tyres other than the ones with genuine specified size are mounted, the ABS may be activated prematurely. • If a non-genuine braking device or non-genuine impact reduction device is mounted, the ABS may be activated prematurely. PROBABLE CAUSES • Mounting of wheels and tyres other than with genuine specified size • Tyre pressure abnormality • Tyre wear and deterioration • Mounting of non-genuine braking device or impact reduction device • Wheel alignment abnormality • Malfunction of brake related parts • ABS-ECU malfunction • Malfunction of hydraulic circuit • External radio wave noise interference DIAGNOSIS PROCEDURE STEP 1. Check the wheels and the tyres. Carry out the following check. • Size check of wheels and tyres • Tyre wear and deterioration statuses • Check the tyre pressure. NOTE: For the tyre pressure, refer to the tyre pressure label attached to the lower section of driver's side door striker. Q: Is the check result normal? YES : Go to Step 2. NO : Correct the wheels and tyres in good condition. Then go to Step 9. STEP 2. Diagnosis code check Use M.U.T.-III to check the diagnosis code for the ABS system. (Refer to P.35B-11.) Q: Is the check result normal? YES : Go to Step 3. NO : Carry out the diagnosis for the diagnosis code. (Refer to P.35B-11.) Then go to Step 9. STEP 3. Check of brake system related components other than hydraulic unit (integrated with ABS-ECU) At the same time with the following checks, also check that no parts other than the genuine parts are mounted. • Brake pad check (Refer to GROUP 35A − On-vehicle Service/Brake Pad Check ). • Brake disc runout check (Refer to GROUP 35A − On-vehicle Service/Brake Disk Check ). • Brake drag force check (Refer to GROUP 35A − Front Disc Brake Assembly or GROUP 35A − Rear Disc Brake Assembly ). Q: Is the check result normal? YES : Go to Step 4. NO : Repair or replace the part(s) having damage or other problems. Then go to Step 9. STEP 4. Wheel alignment check At the same time with the following checks, also check that no parts other than the genuine parts are mounted. • Front wheel alignment check (Refer to GROUP 33 − On-vehicle Service/Front Wheel Alignment Check and Adjustment .) • Rear wheel alignment check (Refer to GROUP 34 − On-vehicle Service/Rear Wheel Alignment Check and Adjustment .) Q: Is the check result normal? 35B-54 ANTI-SKID BRAKING SYSTEM (ABS) TROUBLESHOOTING YES : Go to Step 5. NO : Repair or replace the part(s) having damage or other problems. Then go to Step 9. STEP 5. M.U.T.-III data list Check the following data list. (Refer to P.35B-54.) • Item No.01: FL wheel speed sensor • Item No.02: FR wheel speed sensor • Item No.03: RL wheel speed sensor • Item No.04: RR wheel speed sensor Q: Is the check result normal? YES : Go to Step 7. NO : Go to Step 6. STEP 7. Hydraulic unit check Carry out the following actuator tests, and check if they work normally (Refer to P.35B-55). • Item No.01: FL wheel ABS • Item No.02: FR wheel ABS • Item No.03: RL wheel ABS • Item No.04: RR wheel ABS Q: Is the check result normal? YES : Go to Step 8. NO : Replace the hydraulic unit (integrated with ABS-ECU) (Refer to P.35B-61). Then go to Step 9. STEP 8. ABS operation check STEP 6. Wheel speed sensor check Check that no non-genuine electronic device or no wiring harness of other than genuine electronic device is mounted near the wheel speed sensor (at wheel speed detection section and wiring harness section) (Refer to P.35B-63<Front> or P.35B-65<Rear>). Q: Is the check result normal? YES : Go to Step 7. NO : Remove the non-genuine electronic device or the wiring harness of non-genuine electronic device. Then go to Step 9. Q: Is the check result normal? YES : Intermittent malfunction (Refer to GROUP 00 − How to Use Troubleshooting/How to Cope with Intermittent Malfunctions ). NO : Replace the hydraulic unit (integrated with ABS-ECU) (Refer to P.35B-61). Then go to Step 9. STEP 9. ABS operation check Q: Is the check result normal? YES : This diagnosis is complete. NO : Return to Step 1. Inspection Procedure 10: The initial check sound of hydraulic unit is loud. CAUTION When installing brake tube, match the axial centre of flare nut and brake tube with the centre of hole at the hydraulic unit side, and check that the fluid does not leak. COMMENT ON TROUBLE SYMPTOM The operation sound may be decreased by reducing the load at the rubber mount portion of the brake tube and hydraulic unit. PROBABLE CAUSES • Improper installation of the hydraulic unit • Improper installation of the brake tube DIAGNOSIS PROCEDURE DRIVING CHECK (1) Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position. (2) When vehicle speed reaches 10 km/h, check the operating sound volume and compare it with that of the same model. OK: The operating sound is the same volume or less by comparing with that of the same model. Q: Is the check result normal? YES : This diagnosis is complete. NO : Carry out adjustment for hydraulic unit installation. (Refer to P.35B-59). DATA LIST REFERENCE TABLE M1352011501471 The following items can be read by the M.U.T.-III from the ABS-ECU input data. The following items of ECU input data can be read using M.U.T.-III. ANTI-SKID BRAKING SYSTEM (ABS) 35B-55 TROUBLESHOOTING Item No. Check item Check condition 01 FL wheel speed sensor 02 FR wheel speed sensor 03 RL wheel speed sensor Perform a test run of the vehicle. The speedometer display and the M.U.T.-III display almost agree with each other. (During stop: approximately 0.7km/h) 04 RR wheel speed sensor 05 Power supply voltage 07 Brake switch (input) 09 14 15 86 G sensor Brake switch Emission test mode Ignition switch Normal condition System voltage (10 to 18 V ABS operable range) The brake pedal is released. OFF The brake pedal is depressed. ON Vehicle stopped (level) -0.11 to 0.11 G Running -1 to 1 G The brake pedal is depressed. ON The brake pedal is released. OFF When the emission mode is not executed OFF When the emission mode is executed ON When the ABS system is not activated OFF When the ABS system is activated ON ON 87 Ignition switch (input) Ignition switch is "ON" position 88 Vehicle speed Perform a test run of the vehicle. The speedometer display and the M.U.T.-III display almost agree with each other. 91 Brake pressure sensor Not used. 96 G sensor offset Difference between the positions -0.2 to 0.2 G of the ABS-ECU when the vehicle is stationary and while the vehicle is being driven 105 Power supply voltage (input) System voltage (10 to 18 V ABS operable range) 138 ESS request Not used. • System shutdown by ECU While ABS-ECU is disabled by the diagnostic function, the M.U.T.-III displayed data is different from the actual measurement. ACTUATOR TEST REFERENCE TABLE M1352011601274 Using M.U.T.-III, the following actuators can be forcibly operated: ANTI-SKID BRAKING SYSTEM (ABS) 35B-56 TROUBLESHOOTING NOTE: . • ABS is operated by ABS-ECU. • When ABS-ECU is disabled due to the fail-safe function, the actuator test cannot be performed. • The actuator test can be performed only when the vehicle is stationary. • While the actuator test is performed, the ABS warning lamp flashes at a rate of 2 Hz. • After the actuator test has been performed, the brake warning lamp and ABS warning lamp illuminate until the ignition switch is turned to ON again or the communication between M.U.T.-III and ABS-ECU is terminated. Actuator test specifications Item No. Check item Driven component 01 FL wheel ABS drive 02 FR wheel ABS drive 03 RL wheel ABS drive Solenoid valve for the corresponding wheel of the hydraulic unit and pump motor (simplified inspection mode) 04 RR wheel ABS drive 10 ESS test mode Not used. Operation pattern of items 01 to 04 M.U.T.-III actuator test (Item No.01, 02, 03, 04) start End Increase in pressure Solenoid valve Steady pressure Reduction in pressure Drive Pump motor Stop Approx. 0.05 seconds 1seconds 2 seconds Approx. 0.01 seconds AC606811 CHECK AT ECU TERMINALS M1352011801494 TERMINAL VOLTAGE CHECK Lock lever ACB04918AB ANTI-SKID BRAKING SYSTEM (ABS) 35B-57 TROUBLESHOOTING 1. Operate the lock lever to disconnect the ABS-ECU harness connector as shown in the figure. 3. The terminal layout is shown in the illustration. NOTE: Do not measure terminal voltage for approximately three seconds after the ignition switch is turned to the "ON" position. The ABS-ECU performs the initial check during that period. 2. Disconnect the ABS-ECU connector, and measure the voltages between earth terminal No.13 or No.38 and each respective terminal. ACB05853 Termin Terminal Check item al No. code Checking requirements Normal condition 1 +BM Motor power supply Always Battery voltage 2−5 − − − − 6 IG1 ABS-ECU power supply(IG1) Ignition switch: "ON" Battery voltage Ignition switch: "OFF" 1 V or less 7−9 − − − − 10 CANL CAN bus line − − 11 CANH CAN bus line − − 12 − − − − 13 GND1 Earth Always 1 V or less 14−24 − − − − 25 +BV Solenoid valve power supply Always Battery voltage 26 FR- Wheel speed sensor (FR) signal Drive vehicle Approximately system voltage 27 FR+ Wheel speed sensor (FR) power supply Ignition switch: "ON" Approximately system voltage 28 − − − − 29 RL+ Wheel speed sensor (RL) power supply Ignition switch: "ON" Approximately system voltage 30 RL- Wheel speed sensor (RL) signal Drive vehicle Approximately system voltage 31, 32 − − − − 33 RR- Wheel speed sensor (RR) signal Drive vehicle Approximately system voltage 34 RR+ Wheel speed sensor (RR) power supply Ignition switch: "ON" Approximately system voltage 35 − − − − 36 FL+ Wheel speed sensor (FL) power supply Ignition switch: "ON" Approximately system voltage ANTI-SKID BRAKING SYSTEM (ABS) 35B-58 ON-VEHICLE SERVICE Termin Terminal Check item al No. code Checking requirements Normal condition 37 FL- Wheel speed sensor (FL) signal Drive vehicle Approximately system voltage 38 GND2 Earth Always 1 V or less CONTINUITY CHECK AT WIRING HARNESS-SIDE CONNECTOR 1. Operate the lock lever to disconnect the ABS-ECU harness connector as shown in the figure. 2. Check the resistance and continuity between the terminals indicated in the table below. 3. The terminal layout is shown in the illustration. Lock lever ACB04918AB ACB05853 Terminal No. Signal Normal condition 13 − body earth Earth Continuity exists (2 Ω or less) 38 − body earth Earth Continuity exists (2 Ω or less) ON-VEHICLE SERVICE WHEEL SPEED SENSOR OUTPUT CURRENT MEASUREMENT M1352032800043 The relevant wheel, on which the wheel speed sensor is fitted, should be free to run. 1. Remove the wheel speed sensor connector to be checked. ANTI-SKID BRAKING SYSTEM (ABS) ON-VEHICLE SERVICE CAUTION For precise measurement, do not connect to the wheel speed sensor-side connector and the wiring harness side connector terminal No.1. Harness connector Wheel speed sensor connector 35B-59 Standard value: 5.9 to 8.4 mA or 11.8 to 16.8 mA 5. If the measurement is not within the standard value, or the output current does not change in proportion to the wheel rotation, replace the wheel speed sensor (Refer to P.35B-63 <Front>, P.35B-65 <Rear>). HYDRAULIC UNIT CHECK M1352001701184 1. Raise the vehicle using a jack and support the specified points with a rigid rack. CAUTION Before connecting or disconnecting M.U.T.-III, always turn the ignition switch to the LOCK (OFF) position. MB991709 AC905456 AB 2. Use the special tool test harness (MB991709) to connect a multimeter between the wheel speed sensor-side connector and the wiring harness connector terminal No.2. 3. Turn the ignition switch to the "ON" position. CAUTION Do not rotate the wheel too quickly. Output current changes significantly as the wheel speed detection magnetic encoder comes near or goes away from the wheel speed sensor. 4. Rotate the wheel, on which the wheel speed sensor is fitted, quite slowly to measure the output current with the multimeter. 2. Before setting M.U.T.-III, turn the ignition key to the LOCK (OFF) position. 3. Confirm that the selector lever is in the "N" position, and then start the engine. 4. When carrying out the actuator tests No. 01 to 04, perform the actuator tests using M.U.T.-III while depressing the brake pedal. When carrying out the actuator tests, rotate the wheel by hands to confirm that the braking force changes. NOTE: . • While performing the actuator test, the ABS warning lamp flashes at a rate of 2 Hz. • When ABS-ECU is disabled due to the fail-safe function, the M.U.T.-III actuator test cannot be performed. • After the actuator test has been performed, the ABS warning lamp and brake waning lamp illuminate until the ignition switch is turned to ON again or the communication between M.U.T.-III and ABS-ECU is terminated. ANTI-SKID BRAKING SYSTEM (ABS) 35B-60 ON-VEHICLE SERVICE Depressed Pedal operation M.U.T.-III actuator test (Item No.01, 02, 03, 04) start Released Increase in pressure Solenoid valve position Approximately 2 seconds Steady pressure Approximately 1 second Reduction in pressure Checking the brake force Lock Approximately 3 seconds The pedal is free Approximately 0.05 second AC000954AM 5. This is indicated as shown in the above. 6. When any malfunction has been found, take a necessary action according to the "Judgement Table." Judgement Table Display on M.U.T.-III Operation Inspection result 01 FL wheel speed sensor 02 FR wheel speed sensor 03 RL wheel speed sensor 04 RR wheel speed sensor • Depress the brake pedal to lock the vehicle. • Select the vehicle to be inspected using M.U.T.-III, perform the actuator test. • Rotate the selected wheel by hands to confirm the braking force. Braking force Normal decreases for 3 seconds from the lock status. − − The wheel does not lock even if the brake pedal is depressed. Clogged brake line other than hydraulic unit Check and clean the brake line. Clogged hydraulic circuit in the hydraulic unit Replace the hydraulic unit assembly. Faulty routing of hydraulic unit brake tube Route the brake tube correctly. Braking force does not decrease. Judgem Probable cause ent Error Remedy Malfunction of Replace the hydraulic unit solenoid hydraulic unit valve operation assembly. 7. After the inspection, turn the ignition switch to the LOCK (OFF) position, and then disconnect M.U.T.-III. Hydraulic unit installation adjustment Operate the pre-removal steps for the hydraulic unit. (Refer to P.35B-61.) 1. Remove all brake tubes. 2. Loosen the mounting bolt and nut of the hydraulic unit bracket. 3. Install all brake tubes temporarily. 4. Shake hydraulic unit to all directions with both hands to make the hydraulic unit bracket insulator fit with the unit. 5. Install the hydraulic unit bracket with mounting bolt and nut not to load the brake tube. 6. Install all brake tubes securely. NOTE: Install the flare nut taking care not to let the brake tube turn together. 7. Operate the post-installation steps of the hydraulic unit. (Refer to P.35B-61.) ANTI-SKID BRAKING SYSTEM (ABS) 35B-61 HYDRAULIC UNIT IN THE EVENT OF A DISCHARGED BATTERY M1352003500785 WARNING If the ABS is not operating, the vehicle posture will be unstable during braking, Do not drive the vehicle with the ABS-ECU connector disconnected or with the ABS not operating for any other reason. If the engine is started using a booster cable when the battery is completely flat, and the vehicle is then driven without waiting for the battery to be recharged, the engine may misfire and it may not be possible to drive the vehicle. This is because the ABS consumes a large amount of current when carrying out its initial checks. If this happens, recharge the battery fully. HYDRAULIC UNIT REMOVAL AND INSTALLATION M1352008601241 NOTE: ABS-ECU is located in the hydraulic unit. Pre-removal operation • Brake fluid draining. Post-installation operation • Brake fluid refilling and air bleeding (Refer to GROUP 35A − On-vehicle Service, Bleeding ). • Hydraulic unit check (Refer to P.35B-59). 5 2 6 5 5 16 ± 3 N·m 5 9 1 3 10 ± 2 N·m 5 8 10 11 13 ± 2 N·m 7 4 24 ± 4 N·m ACB06013 AB ANTI-SKID BRAKING SYSTEM (ABS) 35B-62 <<A>> <<B>> HYDRAULIC UNIT Removal steps ABS-ECU harness connector Suction pipe installation bolt Wheel speed sensor harness connector connection 4. Wheel speed sensor harness clip connection >>A<< 5. Brake tube connection 6. Brake tube and clip connection 7. Suction pipe, liquid pipe and clip connection 8. Hydraulic unit (ABS-ECU) and hydraulic unit bracket 9. Hydraulic unit (ABS-ECU) 10. Hydraulic unit bracket insulator 11. Hydraulic unit bracket 1. 2. 3. REMOVAL SERVICE POINTS <<A>> ABS-ECU HARNESS CONNECTOR DISCONNECTION <<B>> HYDRAULIC UNIT (ABS-ECU) REMOVAL • • • • CAUTION Be careful when removing the hydraulic unit because it is heavy. Never loosen the nuts and the bolts because the hydraulic unit cannot be disassembled. Do not drop or shock the hydraulic unit. Do not turn the hydraulic unit upside down or lay down the unit because the inner air becomes difficult to be bled. INSTALLATION SERVICE POINT >>A<< BRAKE TUBE CONNECTION 4 5 3 6 Lock lever 2 1 ACB04919AB ACB04918AB Operate the lock lever to disconnect the ABS-ECU harness connector as shown in the figure. Install the brake pipe to the hydraulic unit as shown in the figure. 1. From master cylinder (primary) <Marking colour: Blue and white> 2. From master cylinder (secondary) <Marking colour: Yellow and white> 3. To front brake (RH) <Marking colour: Orange> 4. To front brake (LH) <Marking colour: Red> 5. To rear brake (RH) <Marking colour: White> 6. To rear brake (LH) <Marking colour: Pink> ANTI-SKID BRAKING SYSTEM (ABS) 35B-63 WHEEL SPEED SENSOR WHEEL SPEED SENSOR REMOVAL AND INSTALLATION <FRONT> M1352008301659 CAUTION The vehicle speed detection encoder collects any metallic particle easily, because it is magnetised. Make sure that the encoder should not collect any metallic particle. Check that there is not any trouble prior to reassembling it. Pre-removal and post-installation operation Air cleaner body assembly removal and installation <Refer to GROUP 15 − Air Cleaner > <Front wheel speed sensor (LH)>. 2 3 13 ± 2 N·m 11 ± 2 N·m 3 4 5 1 4 8.5 ± 1.5 N·m 2 11 ± 2 N·m 5 1 13 ± 2 N·m 8.5 ± 1.5 N·m ACB05594 AB 1. 2. >>A<< 3. 4. 5. Removal steps Bolt (front wheel speed sensor and knuckle connection) Front wheel speed sensor connector Front wheel speed sensor grommet Front wheel speed sensor Harness clip >>B<< NOTE: The vehicle speed detection encoder is integrated with the front wheel bearing, which cannot be disassembled. INSTALLATION SERVICE POINTS >>A<< FRONT WHEEL SPEED SENSOR GROMMET INSTALLATION Front wheel speed sensor grommet Body panel AC900799AB Install the front wheel speed sensor grommet to the body panel snugly as shown in the figure. ANTI-SKID BRAKING SYSTEM (ABS) 35B-64 WHEEL SPEED SENSOR >>B<< HARNESS CLIP INSTALLATION A A Wheel speed sensor Section A - A Harness clip Marking Wheel speed sensor harness AC608814AB Hydraulic unit (integrated with ABS-ECU) Front wheel speed sensor Clip Marking (Color: White) ACC00568AB Install the front wheel speed sensor to the harness clip as shown in the figure. ANTI-SKID BRAKING SYSTEM (ABS) 35B-65 WHEEL SPEED SENSOR REMOVAL AND INSTALLATION <REAR> M1352008301660 CAUTION The vehicle speed detection encoder collects any metallic particle easily, because it is magnetized. Make sure that the encoder should not collect any metallic particle. Check that there is not any trouble prior to reassembling it. <2WD> Pre-removal and post-installation operation Quarter trim removal and installation (Refer to GROUP 52A − Trim ). 5 3 4 3 N 2 4 1 1 8.5 ± 1.5 N·m 8.5 ± 1.5 N·m 5 N 2 ACB05519AB >>B<< 1. >>B<< 2. 3. Removal steps Bolt (rear wheel speed sensor and trailing arm assembly connection) O ring Rear wheel speed sensor connector >>A<< 4. Removal steps (Continued) Rear wheel speed sensor grommet Rear wheel speed sensor >>B<< 5. NOTE: The vehicle speed detection encoder is integrated with the rear hub assembly, which cannot be disassembled. ANTI-SKID BRAKING SYSTEM (ABS) 35B-66 WHEEL SPEED SENSOR <4WD> Pre-removal and post-installation operation Quarter trim removal and installation (Refer to GROUP 52A − Trim ). 3 2 3 2 4 1 4 1 ACB05520AB >>C<< 1. >>A<< 2. 3. 4. Removal steps Rear wheel speed sensor and trailing arm assembly connection Rear wheel speed sensor grommet Rear wheel speed sensor connector Rear wheel speed sensor NOTE: The vehicle speed detection encoder is integrated with the rear hub assembly, which cannot be disassembled. INSTALLATION SERVICE POINTS >>A<< REAR WHEEL SPEED SENSOR GROMMET INSTALLATION Install the rear wheel speed sensor grommet to the body panel snugly as shown in the figure. >>B<< REAR WHEEL SPEED SENSOR, O-RING, AND BOLT (CONNECTION OF REAR WHEEL SPEED SENSOR WITH REAR WHEEL HUB ASSEMBLY) INSTALLATION Rear wheel speed sensor Rear wheel hub assembly O ring Rear wheel speed sensor grommet AC807126 AE Body panel AC900807AB 1. Align the mounting bolt hole position of rear wheel speed sensor with the mounting bolt hole position of rear wheel hub assembly. ANTI-SKID BRAKING SYSTEM (ABS) 35B-67 WHEEL SPEED SENSOR CAUTION • Do not insert the rear wheel speed sensor at an angle or by prying the sensor because it may be possible that the O-ring of rear wheel speed sensor cannot be mounted properly. • After the insertion, do not perform an alignment of mounting bolt hole positions by rotating the rear wheel speed sensor. INSPECTION M1352008400750 WHEEL SPEED SENSOR CURRENT CHECK 2. As shown in the figure, mount the rear wheel speed sensor while keeping the sensor perpendicular to the rear wheel hub assembly. >>C<< REAR WHEEL SPEED SENSOR INSTALLATION MB992006 Rear wheel hub assembly Rear wheel speed sensor AC705246 AC AC507330 AB Push the rear wheel speed sensor to the end and install it securely. CAUTION • Do not connect the battery terminals in reverse as the wheel speed sensor may be damaged. • When the current value is measured by the wheel speed sensor connector, measure it with the wheel speed sensor installed in the vehicle. 1. Connect the circuit tester to the wheel speed sensor using the special tool extra fine probe (MB992006), and measure the sensor current as a single unit. Standard value: 5.9 to 8.4 mA or 11.8 to 16.8 mA 2. If the measurement value is not within the standard value range, replace the wheel speed sensor with a new one. ANTI-SKID BRAKING SYSTEM (ABS) 35B-68 WHEEL SPEED SENSOR WHEEL SPEED SENSOR INSULATION CHECK 1. Connect the circuit tester to the wheel speed sensor using the special tool extra fine probe (MB992006), and measure the insulation resistance between the terminal No. 1/2 and the wheel speed sensor body as a single unit. Standard value: 5 MΩ or more 2. If the insulation resistance is not within the standard value range, replace the wheel speed sensor with a new one. <Front> <Rear> MB992006 AC507331AB
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