Warning! Read This! Updated Instructions SYSTEM WIRING DIAGRAMS Charging Circuit Typical 1988/91 Honda Civic/CRX Application: 1988/91 Honda Civic, CRX 1488cc, 1600cc engine Service Bulletins: Important Acura factory service bulletins relating to your charging system. Bulletin No.: 88-023 Battery Test Procedure 88-031 Repeated Battery Failure - Low Charge Rate Fix (1988 only) 92-001 Charging System Testing - Revised Procedures HSN392-01 - Parasitic Test Info HSN685-01 Normal Battery Draw Specifications Important Information The alternators on these vehicles are controlled by the Electronic Control Unit (ECU) in conjunction with the Electric Load Detector (ELD). Charging rates may vary depending on engine load, speed and temperature as well as alternator loads. WARNING ! These units do not charge under certain conditions. The charge warning light will be off but the system voltage will be set at 12.5Vdc. To override this function STEP ON THE BRAKE. This will activate the alternator control circuits and allow the alternator to charge. PI0036/Page 1 of 4/v1.0 (c) 1998 MRIC and Snap-on Tools Co. 5. Attach test light to White/Blue wire Troubleshooting: 1988/91 Honda Civic, Civic CRX with key on and engine off The following steps will help you troubleshoot your charging system. 1. Key and Engine off. 2. Unplug harness from alternator. Test Light ON SYSTEM OK Test Light OFF ***REPAIR*** a. Check fuse #14 in dash fuse box. b. Check Wht/Blu wire from alternator to charge warning light. c. Check Blk/Yel wire from dash fuse box to charge warning light. 6. Attach test light to Black/Yellow wire 3. Turn the key on do not start the engine. 4. Check instrument panel with key on and engine off charge warning light. Key On and Engine Off. Charge Light OFF SYSTEM OK PI0036/Page 2 of 4/v1.0 Charge Light ON ***REPAIR*** White/Blue wire is grounded. Test Light ON SYSTEM OK Test Light OFF ***REPAIR*** a. Check fuse #14 in dash fuse box. b. Check Blk/Yel wire from dash fuse box to alternator harness plug. 7. 10. Check for voltage on voltmeter. Check alternator B+ harness. Key ON Engine OFF. Harness attached to alternator. Test Light ON SYSTEM OK Test Light OFF ***REPAIR*** a.Check fuse #31 in underhood fuse box. b.Check White wire from alternator to underhood fuse box. 8. Connect voltmeter positive (+) lead to battery and negative (-) lead to alternator “C” terminal (White/yellow) wire. 9. Start the engine, turn all accessories off. Volts on Meter SYSTEM OK NO Volts on meter ***REPAIR*** a. Check for an open in Blue wire from alternator plug to Electronic Control Unit. 11. Turn headlights on 12. Check for voltage on voltmeter. low beams. Set voltmeter to Vdc “C” white/yellow Start the Engine Headlights ON LOW (+) positive “ C” (White/Yellow) NO Volts on Meter SYSTEM OK All accessories off PI0036/Page 3 of 4/v1.0 Volts on meter ***REPAIR*** a. Check for short to ground in Blue wire between alternator plug and Electronic Control Unit. Electric Load Detector Test (1988/89 Acura Integra) 1. Locate Electric Load Detec- 2. Disconnect 3-pin tor (ELD) in underhood fuse box (located in engine compartment). connector from ELD. 3. Turn Ignition Switch ON. CAUTION: Never disconnect battery while motor is running! ELD Main Fuse Box VOLTAGE DROP TEST: Perform this test under full load (all lights, fan, A/C, etc. on) with engine running at 2000rpm. Reading on voltmeter should be less than .2 volts. 4. Check for voltage between Black/ 5. Check for 2Vdc between Green/Red Yellow wire and Black wire on harness connector. wire GROUND CIRCUIT TEST: Perform this test under full load (all lights, fan, A/C, etc. on) with engine running at 2000rpm. Reading on voltmeter should be less than .2 volts. Battery Voltage SYSTEM OK No Battery Voltage *** REPAIR*** a. Check fuse #14 in dash fuse box. b. Check for an open in BLK/Yel wire between underhood fuse box and dash fuse box. c. Poor ground at right kick panel under the dash. d. Open in Black wire from ground connection to main fuse box. PI0036/Page 4 of 4/v1.0 Voltage 2 Vdc SYSTEM OK NO Voltage or incorrect voltage ***REPAIR*** a. Repair or replace ELD CURRENT DRAIN TEST: With all accessories turned off and/or disconnected, test light should not glow. LIABILITY DISCLAIMER: The information contained in this document is based upon data which we believe to be correct. We assume no liability for errors or omissions herein. Furthermore, we assume the person or persons using this information to be knowledgeable of safety precautions involved with working on a vehicle's electrical system. We assume no liability for damage, either to the vehicle or the person working on the vehicle, that may occur while following the iinstructions in this document.