TCS

TCS DTC 31: Engine Retard Command (PFINH) Signal

NOTE: If the MIL or ABS indicator is ON, troubleshoot the PGM-FI or ABS first.

1. Disconnect PCM connector D (17P) and ABS/TCS control unit connector B (16P).





2. Check for continuity between PCM connector D (17P) terminal No. 5 and body ground.
Is there continuity?
YES - Repair short to body ground in the wire between the PCM and the ABS/TCS control unit.
NO - Go to step 3.
3. Connect PCM connector D (17P).
4. Start the engine.








5. Measure the voltage between PCM connector D (17P) terminal No. 5 and body ground.

NOTE: Use the 10 V range or similar range in an analog tester.

Does the tester needle swing to about 2.5 V?
YES - Go to step 6.
NO - Check for loose PCM connectors. If necessary, substitute a known-good PCM, and recheck.








6. With an analog voltmeter set to the 10 V or similar range, measure the voltage between ABS/TCS control unit connector B (16P) terminal No. 10 and body ground.
Does the tester needle swing to about 2.5 V?
YES - Check for loose ABS/TCS control unit connectors. If necessary, substitute a known-good ABS/TCS control unit, and recheck.
NO - Repair open in the wire between the PCM and the ABS/TCS control unit.