P0688

Test 1 - 2:

Test 3 - 6:

Test 7 - 8:

SYMPTOM
P0688-ASD RELAY SENSE CIRCUIT LOW

WHEN MONITORED
With ignition key on. Battery voltage greater than 10 volts.

SET CONDITION
No voltage sensed at the PCM when the ASD relay is energized. One Trip Fault.

POSSIBLE CAUSES
- Verify ASD DTC
- ASD relay
- (A14) fused B+ circuit
- ASD relay output circuit open
- (K25) ASD relay output circuit open
- PCM no start
- PCM start