Traction Control System

TCS DTC 34: Reference Voltage (VREF) Signal

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

1. Disconnect PCM connector E (20P) and ABS/TCS control unit connector B(16P).





2. Check for continuity between PCM connector E (20P) terminal No. 6 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. Measure the voltage between PCM connector E (20P) terminal No. 6 and body ground.
Is there more than 1 V ?
YES-Repair short to power in the wire between the PCM and the ABS/TCS control unit.
NO-Go to step 4.
4. Connect PCM connector E (20P).
5. Turn the ignition switch ON (II).





6. Measure the voltage between PCM connector E (20P) terminal No. 6 and body ground.
Is there about 5 V?
YES-Go to step 7.
NO-Check for loose PCM connectors. If necessary, substitute a known-good PCM, and recheck.





7. Measure the voltage between ABS/TCS control unit connector B (16P) terminal No. 2 and body ground.
Is there about 5 V?
YES-The system is OK at this time. If the problem recurs, 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.