Nissan/Infiniti
Chapter 14
This chapter contains information for testing Nissan and Infiniti vehicles with the Asian Import
Vehicle Communication Software (VCS). The following Nissan and Infiniti systems may be
available for testing:
•
•
•
•
Engine
Transmission
Antilock Brake Systems (ABS)
Supplemental Restraint System (SRS)
14.1 Testing Engine Systems
Nissan and Infiniti engine system testing includes:
• “Code Reading Connectors and Locations” on page 151
• “Code Types 07” on page 152
• “Functional Tests” on page 157
14.1.1 Code Reading Connectors and Locations
Figure 14-1 and Figure 14-2 on page 152 show Nissan and Infiniti diagnostic connector
locations and adapter information for reading engine codes.
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To read codes:
1. Connect the molded adapter to the connector shown in Figure 14-1 and Figure 14-2 on
page 152, which may be in the following locations:
–
–
–
–
–
Driver-side kick panel
Passenger-side kick panel
Left side of dash
Under passenger seat
Behind driver-side trim panel
2. The scan tool will indicate the connector location.
3. Select “codes” from the “codes and data” menu or select “how to get codes” from the code
functions menu and follow the on-screen instructions.
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Testing Engine Systems
A
B
Figure 14-1 Vehicle diagnostic connector
A—Diagnostic connector
B—NISSAN-1 adapter
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NOTE:
Some models have a similar-looking 16-terminal connector under the instrument panel that is
not a scan tool connector.
Pre-1995 vehicles that do not have this 12-pin diagnostic connector may have an ECM with
one or two fault-indicating LEDs. Refer to “Code Types 07” for information on reading codes
from these vehicles.
A
2
1
9
3
4
B
5
6
7
8
10 11 12 13 14 15 16
Figure 14-2 Nissan diagnostic connectors
A—16-pin DLC
Use OBD-II adapter.
B—14-pin connector
Use the NISSAN-2 adapter.
14.1.2 Code Types 07
i
NOTE:
For transmission codes on models with the 4EAT transmission, see “Testing Transmission
Systems” on page 161.
If the test vehicle has a diagnostic connector for code gathering, the scan tool displays vehicle
connection instructions at the end of the vehicle ID sequence (See “To read codes:” on
page 151.
If the vehicle does not have a diagnostic connector for code gathering, select HOW TO GET
CODES from the CODE FUNCTIONS menu and manual code gathering instructions display
152
(see “How to Get Codes” on page 15). You can also gather codes manually on some vehicles
with a diagnostic connector.
The scan tool displays the control system name and code type. Nissan uses three basic types
of control system:
• Two mode system that outputs Code Type 07a
• Five mode system that outputs Code Type 07a
• Two mode system that outputs Code Type 07b
Both code types flash 2-digit (10s and 1s) codes.
Code Type 07a—Two Mode System
On models that use Code Type 07a (two mode system), the ECM is placed in the diagnostic
mode by activating a rotary or slide switch on the ECM as follows (Figure 14-3):
Table 14-1 Rotary and slide switch functions
SWITCH
MODE
Clockwise = diagnostic mode
Rotary Switch
Counterclockwise = normal vehicle operation
On = diagnostic mode
Slide Switch
Off = normal vehicle operation
Sight Window for LED Monitor Lamps
B
Top View Side View
C
A
D
Pathfinder, Pickup, and Van
All Others
Figure 14-3 ECM switch locations
A—Diagnostic mode switch
B—ECM
C—Mode selector
D—LED monitor lamps
With the diagnostic switch in the “normal vehicle operation” position, the LEDs can be used to
check oxygen sensor operation and air-fuel ratio control. Refer to Nissan service procedures.
When the ECM is first placed in the diagnostic mode, the LEDs flash several codes. These
codes indicate that the ECM has not yet received input signals from several switches. The
codes may be valid or false. For accurate diagnosis, verify the code status by operating the
appropriate switches to send input signals to the ECM.
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Testing Engine Systems
To read codes for two-mode control systems with Code Type 07a:
1. Verify that the diagnostic switch is in the normal vehicle operation position: slide the
switch to the OFF position and the rotary switch fully counterclockwise.
2. Turn the ignition on.
3. Verify that the LEDs light for a bulb check.
If the LEDs do not light, refer to Nissan test procedures for diagnosis. Codes cannot be
displayed if the LEDs do not light for a bulb check.
4. Turn the rotary diagnostic switch fully clockwise or move the slide switch to ON.
5. Observe the LEDs.
At this point, the LEDs flash several codes for switch inputs or other signals that the ECM
has not received. These may include codes 23, 24, and 31 or others. Operate switches as
explained in steps 6 and 7 to verify code status.
6. For most models:
a. Depress and release the accelerator.
b. Move the gear selector from neutral through the drive ranges and back to neutral
(automatic transmission), or from neutral to the highest gear position and back to
neutral (manual transmission).
c. Turn the air conditioner switch or heater blower switch from OFF to ON to OFF.
d. Proceed to step 8.
7. For 1985–89 300ZX:
a. Start the engine.
b. With an automatic transmission, apply the service brakes and shift the transmission
from neutral to drive and back to neutral.
c. For turbo models, drive at a speed above 6 mph.
d. For all models, turn the A/C switch or heater blower switch from OFF to ON to OFF
with the engine running.
e. For models without A/C, turn the headlamp and rear demister switches from OFF to
ON to OFF.
8. Observe the LEDs on the ECM for flashing codes.
If no faults are present, the LEDs should flash code 31 for vehicles without A/C or code 44
for vehicles with A/C. Any other codes flashed at this point are valid trouble codes that
should be diagnosed.
9. Turn the rotary diagnostic switch fully counterclockwise or move the slide switch to OFF.
10. Turn the ignition off.
Code Type 07a—Five Mode System
Gather codes manually from these systems by placing the ECM in the diagnostic mode and
observing two flashing LEDs (Figure 14-4 on page 155). These systems flash the first digit on
the red LED (10s digit). The second digit flashes on the green LED (1s digit).
For example: RED—RED—pause—GREEN—GREEN—GREEN indicates code 23.
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Code 21 Followed by Code 32
Red LED
Green LED
Figure 14-4 Nissan Code Type 07a—five mode system
Table 14-2 Nissan Code Type 07a
Used on:
Nissan (1990 and earlier models)
Pattern:
10s and 1s
Read codes on:
Red LED (10s) and green LED (1s) on ECM
Start codes by:
Follow the appropriate diagnostic code reading procedure.
When done:
Turn the ignition off, turn the diagnostic switch off or counterclockwise, and clear
codes.
Code 44 or 55 are pass code (system OK) for models with A/C. Code 31 may be a pass code for
models without A/C.
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To read codes for five-mode control systems with Code Type 07a:
1. Locate the ECM below the passenger seat (Table 14-2).
2. Turn the ignition on; do not start the engine.
3. Verify that the LEDs light briefly for a bulb check.
If the LEDs do not light, correct the problem before proceeding.
4. While observing the two LEDs on the ECM, turn the diagnostic selector switch on the
ECM fully clockwise.
5. After the LEDs flash three times, turn the diagnostic selector switch on the ECM fully
counterclockwise.
IMPORTANT:
Do not allow the LEDs to flash four times with the selector switch fully clockwise or the trouble
codes will be erased.
The ECM is now in the diagnostic mode (see Table 14-2).
6. Write down any codes present.
Code 55 is a pass code. All codes flash only once. Repeat steps 3 through 6 to observe
any missed codes.
7. Clear codes:
a. Turn the diagnostic selector switch on the ECM fully clockwise.
b. After the LEDs flash four times, turn the diagnostic selector switch on the ECM fully
counterclockwise.
8. Repeat steps 3 through 6 to verify that no more codes are present.
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Code Type 07b—Two Mode System
The system that outputs Code Type 07b is also placed in diagnostic mode by activating a
switch on the ECM. Codes then simultaneously flash on the check engine lamp and a single
LED on the ECM. These models flash codes as a series of long-and-short pulses (10s and 1s)
on the LED and on the CHECK engine lamp on the dash (Figure 14-5 and Table 14-3).
For example: LONG—LONG—LONG—pause—SHORT—SHORT indicates code 32.
Longer
Pause
Pause
Tens, Long Flashes
Pause
Ones,
Short
Code 32
Code 21
Figure 14-5 Nissan Code Type 07b
Table 14-3 Nissan Code Type 7b
Used on:
Nissan (1990 and later models without a connector for hook-up)
Pattern:
10s and 1s—Long and short
Read codes on:
Check Engine lamp (or LED on ECM)
Start codes by:
Follow the appropriate diagnostic code reading procedure.
This procedure is for vehicles that do not have a connector for hook-up. To display codes, the
ECM must be in the diagnostic mode.
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To read codes for two-mode control systems with Code Type 07b:
1. Locate the ECM below the glove box on the toe board.
2. Turn the ignition on with the engine off.
3. Verify that the LED and the CHECK ENGINE lamp light briefly for a bulb check. If either
does not light, correct the problem before proceeding.
4. Turn the diagnostic selector switch on the ECM fully clockwise.
5. Wait at least two seconds.
6. Turn the ECM diagnostic selector switch fully counterclockwise.
7. Count the long-and-short flashes either on the LED in the ECM or on the CHECK ENGINE
lamp in the dash. Any codes present flash one time each.
For example: LONG—LONG—LONG—pause—SHORT—SHORT indicates code 32.
8. Write down any codes present.
9. Clear codes by turning the diagnostic selector switch on the ECM fully clockwise. Wait two
seconds then repeat steps 5 and 6 to verify that no more codes are present.
10. Turn the ignition off.
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14.1.3 Functional Tests
i
NOTE:
Operations described in this section are not available on all tool platforms.
The FUNCTIONAL TESTS selection is available (Figure 14-6) for most 1987–96 models with
electronic concentrated control systems (ECCS).
MAIN MENU - NISSAN
CODE FUNCTIONS
CUSTOM SETUP
>FUNCTIONAL TESTS
[PRESS N FOR HELP]
Figure 14-6 FUNCTIONAL TESTS selection
Select FUNCTIONAL TESTS and a screen like Figure 14-7 displays.
CAUTION: YOU MUST READ TROUBLE CODES
BEFORE SELECTING FUNCTIONAL TESTS OR
CODES CAN BE LOST.
PRESS Y FOR TESTS OR N TO EXIT.
Figure 14-7 Read Trouble Codes warning
IMPORTANT:
Read trouble codes before selecting a functional test, otherwise codes may be lost.
Pressing Y opens the Functional Tests menu (Figure 14-8).
FUNCTIONAL TEST MENU
>EXHAUST MONITOR
SWITCH TEST
BASE IDLE TEST
AIR/FUEL CHECK
REAL TIME MONITOR
Figure 14-8 Functional Tests menu
There are five diagnostic modes built into vehicles with ECCS:
•
•
•
•
•
Mode 1—Exhaust monitor
Mode 2—Air/Fuel Check
Mode 3—Self-Diagnosis
Mode 4—Switch Test
Mode 5—Real Time Monitor
A BASE IDLE TEST is also available on the menu. However, this “special” test is not a
standard ECCS mode test. The sections that follow describe each of these functional tests.
The self-diagnosis mode (mode 3) is not available on the Functional Tests menu. This mode
is entered when you select AUTO CODE READ from the CODE FUNCTIONS menu.
Once you select a functional test, the scan tool automatically switches the ECM to the correct
mode and tells you how to begin the testing. As the ECM changes modes, LEDs 3 and 4 on
the scan tool flash the corresponding mode number.
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Exhaust Monitor Test (Mode 1)
The Exhaust Monitor test lets you monitor the mixture ratio feedback signal from the oxygen
sensor (O2S).
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To perform an Exhaust Monitor test:
1. Select EXHAUST MONITOR from the Functional Tests menu.
A screen like Figure 14-9 displays.
MAKE SURE ENGINE IS RUNNING AND WARM
(IN CLOSED LOOP) BEFORE MONITORING THE
EXHAUST OXYGEN CONTENT.
PRESS Y TO CONTINUE
Figure 14-9 EXHAUST MONITOR selected
2. Start the engine and warm it to normal operating temperature.
3. Press Y.
The request is processed, then a screen like, then a screen like Figure 14-10 displays.
HOLD ENGINE AT 2000 RPM TO MONITOR
EXHAUST OXYGEN SENSOR.
EXHAUST________LEAN
Figure 14-10 Exhaust Monitor Test
4. Raise and hold engine speed at 2000 RPM.
The display shows LEAN when the exhaust is lean, and RICH when rich. LED 3 on the
scan tool flashes to indicate that the scan tool is receiving a signal from the O2S.
Air/Fuel Check (Mode 2)
The Air/Fuel Check lets you monitor the air-to-fuel ratio by comparing the oxygen sensor
(O2S) signal to the fuel injector control signal.
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To perform an Air/Fuel check:
1. Select AIR/FUEL CHECK from the Functional Tests menu.
A screen like Figure 14-11 displays.
MAKE SURE ENGINE IS RUNNING AND WARM
(IN CLOSED LOOP) BEFORE MONITORING THE
EXHAUST OXYGEN CONTENT.
PRESS Y TO CONTINUE.
Figure 14-11 AIR/FUEL CHECK selected
2. Start the engine and warm it to normal operating temperature, then press Y.
The request is processed, then a screen like Figure 14-12 displays.
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HOLD ENGINE AT 2000 RPM TO MONITOR
AIR/FUEL MIXTURE COMPENSATION.
EXHAUST_______LEAN
COMPENSATION___RICH
Figure 14-12 Air/Fuel Check test
3. As instructed, increase and hold engine speed at 2000 RPM.
The EXHAUST parameter displays LEAN when the O2S detects a lean exhaust, and
RICH when the exhaust is rich. The COMPENSATION parameter displays the response
sent to the fuel injection system.
Typically, when the O2S feedback signal (EXHAUST) is LEAN, the fuel injection system
is commanded to go rich, and the COMPENSATION parameter displays RICH.
Similarly, when the O2S feedback signal (EXHAUST) is RICH, the fuel injection system is
commanded to go lean, and the COMPENSATION parameter displays LEAN.
LED 3 on the scan tool flashes as it receives a signal from the O2S, and LED 4 flashes as
it receives the signal from the COMPENSATION circuit.
When both readings are the same and the LEDs flash simultaneously, the O2S signal and
the fuel injection command are in balance.
Self-Diagnosis (Mode 3)
Nissan mode 3 is the AUTO CODE READ selection from the Code Functions menu on the
scan tool display (see “Automatic Code Reading” on page 13).
Switch Test (Mode 4)
The Switch test lets you check the following on-off switch circuits:
• Vehicle speed sensor (VSS)
• Start signal
• Idle switch
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To perform a Switch test:
1. Select SWITCH TEST from the Functional Tests menu.
A screen like Figure 14-13 displays.
ENTER TEST WITH KOEO. START SIG OR IDLE
SW CHANGES LED 4, VEHICLE SPEED SENSOR
CHANGES LED 3 & EACH DISPLAY ALTERNATIVES
PRESS Y TO CONTINUE, N TO EXIT.
Figure 14-13 SWITCH TEST selected
2. Start the engine and warm it to normal operating temperature.
3. Press Y.
The request is processed, then a screen like Figure 14-14 displays.
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TEST EACH SWITCH INDIVIDUALLY:
VEHICLE SPEED SENSOR___ABOVE 12MPH/20KPH
START SIGNAL OR IDLE SW_____________HIGH
NOTE:START/IDLE SW INDICATES CHANGE ONLY
Figure 14-14 Switch Test
The VSS parameter displays ABOVE when speed exceeds 12 mph (20 kph), and BELOW
when speed is 12 mph or lower. Also, LED 3 turns on when the vehicle speed is above 12
mph and off when below.
The IGNITION SW OR IDLE SW parameter alternately displays HIGH or LOW each time
the ignition switch or idle switch status changes. Also, LED 4 turns on when this
parameter displays LOW and off when HIGH.
Real-Time Monitor (Mode 5)
This function lets you check the following vehicle sensor circuits:
•
•
•
•
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Airflow meter
Fuel pump
Crank angle sensor
Ignition coil primary
To perform a real-time monitor test:
1. Select REAL TIME MONITOR.
A screen like Figure 14-15 displays.
START ENGINE THEN PRESS Y TO CONTINUE.
NOTE: OK TO DRIVE CAR.
Figure 14-15 REAL TIME MONITOR selected
2. After you start the engine, press Y.
The request is processed, then a screen like Figure 14-16 displays.
REAL TIME FAULT MONITOR:
AIRFLOW CKT__NORMAL
FUEL PUMP___NORMAL
CRANK ANGLE SENSOR SIGNAL_________NORMAL
IGNITION COIL PRIMARY SIGNAL______NORMAL
Figure 14-16 Real Time Monitor test
3. Drive the vehicle to fully test these parameters.
If a problem is detected in a sensor circuit, the displayed parameter changes from
NORMAL to FAULTY. The LED 3 or 4 flashes, and the scan tool beeps.
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Base Idle Test
The Base Idle test lets you check and adjust the vehicle base idle speed.
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To perform a Base Idle test:
1. Select BASE IDLE TEST from the Functional Tests menu.
A screen similar to Figure 14-17 displays.
RUN ENGINE AT 2000 RPM FOR 2 MINUTES,
THEN SNAP THROTTLE 3 TIMES AND
RETURN TO IDLE FOR 1 MINUTE.
[3:00]
PRESS Y WHEN IDLE STABILIZES.
Figure 14-17 BASE IDLE TEST selected
2. Start the engine and warm it to normal operating temperature.
3. Press Y.
The scan tool momentarily processes this request.
4. Follow the on-screen instructions. A countdown timer also displays for your convenience.
i
NOTE:
When the timer reaches 0:00 it does not reset.
5. Press Y to continue the test.
A screen like Figure 14-18 displays.
AUXILIARY AIR CONTROL (AAC)
VALVE SHOULD NOW BE CLOSED.
SET BASE IDLE NOW.
PRESS N WHEN DONE.
Figure 14-18 Base Idle Test
The scan tool has now instructed the vehicle ECM to close the auxiliary air control (AAC)
valve. You can now adjust the vehicle base idle.
14.2 Testing Transmission Systems
Transmission system tests are available on models with the 4EAT transmission.
14.2.1 Nissan 4EAT Transmission Testing
If you select TRANSMISSION from the System Selection menu at the end of the vehicle ID
sequence (see “Identifying a Vehicle” on page 7), the scan tool gives you instructions for
applying power.
Automatic code gathering is not available on older Nissan 4-speed Electronic Automatic
Transmissions (4EAT), but is available on most 1990 and later models. For transmission
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codes, select HOW TO GET CODES from the CODE FUNCTIONS menu and the scan tool
either displays manual code gathering instructions or gathers the codes for you.
For 4EAT transmissions that require manual code gathering, Nissan uses Type 7c
transmission codes (Figure 14-19 and Table 14-4 on page 162).
2.0 Sec.
0.1 Sec.
0.9 Sec
0.6 Sec.
2.5 Sec.
Begin
Code
1
2
3
4
5
6
Code 5
7
8
9
10
Figure 14-19 Nissan Code Type 07c
Table 14-4 Nissan Code Type 7c
Used on:
Nissan 4EAT transmissions
Pattern:
Long flash
Read codes on:
POWER, A/T CHECK, or O/D lamp (depending on vehicle)
Start codes by:
Follow the appropriate Nissan procedure.
When done:
Codes clear automatically when the problem is fixed.
Code Type 7c consists of a 2-second flash, followed by a 1-second pause, then a series of ten
short (0.1-second) flashes. Short flashes represent code numbers 1 through 10. A long
(0.6-second) flash indicates a fault at the indicated position.
For example, SHORT—SHORT—SHORT—SHORT—LONG—SHORT—SHORT—
SHORT—SHORT—SHORT indicates Code 5 because the fifth flash is long. If no codes are
present, the ten flashes are all short (0.1-second). The code sequence is followed by a
2.5-second pause, a 2-second flash, and then the pattern repeats.
To read Nissan 4EAT transmission codes manually, you must follow a specific diagnostic
procedure. Failure to do so may result in misreading codes or inaccurate diagnosis.
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To manually place the Nissan 4EAT control system in diagnostic mode:
1. Start and warm the engine to operating temperature.
2. Switch the ignition off, move the gear selector to PARK, set the A/T MODE switch
(optional) to AUTO, and the O/D switch to ON.
3. Turn the key on (engine off).
Depending on the vehicle, either the POWER lamp, the A/T CHECK lamp, or the O/D
lamp illuminates for approximately 2 seconds. This is the lamp that flashes codes.
4. Turn the ignition off, place the gear selector in DRIVE, and set the O/D switch to OFF.
5. Turn the key on (engine off), wait 2 seconds and move the gear selector to 2ND.
6. Set the O/D switch to ON, move the gear selector to 1ST, and set the O/D switch to OFF.
7. Fully depress and release the throttle to begin gathering manual codes.
The lamp flashes Code Type 7c (Figure 14-19). If no codes are present, the lamp flashes
evenly 10 times after a long start flash.
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14.3 Testing Supplemental Restraint Systems (SRS)
Most 2000 and later Nissan and Infiniti SRS, or airbag, codes can be read and cleared using
the scan tool. Manual codes are available on other models.
14.3.1 Manual Code Reading
Nissan and Infiniti vehicles transmit Type 07b SRS codes (Figure 14-20 and Table 14-5).
Longer
Pause
Pause
Tens, Long Flashes
Pause
Ones,
Short
Code 32
Code 21
Figure 14-20 Nissan Code Type 07b
Table 14-5 Nissan Code Type 7b
Used on:
Nissan (most 1990 and later models)
Pattern:
10s and 1s—Long and short
Read codes on:
Check Engine lamp (or LED on ECM)
Start codes by:
Follow the appropriate diagnostic code reading procedure.
2000 and Earlier Vehicles
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NOTE:
Diagnosis mode activates only when a malfunction is detected.
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To read SRS codes for 2000 and earlier vehicles:
1. Turn the ignition on.
2. Press the driver-side door switch at least 5 times within 7 seconds.
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To clear codes for 2000 and earlier vehicles:
1. Repair the malfunction.
2. Switch the ignition off for at least 1 second, then switch it back on.
2001 Vehicles
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NOTE:
If SRS does not enter diagnosis mode even though malfunction is detected in user mode,
check the vehicle battery voltage. If the battery voltage is less than 9 V, charge the battery.
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Chapter 14
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Testing Supplemental Restraint Systems (SRS)
To read SRS codes for 2001 vehicles:
1. Turn ignition switch on.
2. After the AIRBAG warning lamp (Figure 14-21) lights for 7 seconds, turn ignition switch off
within 1 second.
Figure 14-21 AIRBAG warning lamp
3. Wait more than 3 seconds.
4. Repeat the previous steps 1 to 3 times.
5. Turn ignition switch on.
SRS is now in diagnosis mode.
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To clear codes for 2001 vehicles:
1. Open driver-side door.
2. Turn ignition switch on.
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