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Symptom: P0688-ASD RELAY SENSE CIRCUIT LOW When Monitored and Set Condition: 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 INTERMITTENT CONDITION ASD RELAY FUSED B+ CIRCUIT ASD RELAY OUTPUT CIRCUIT OPEN (NO START) IPM FUSE & RELAY CENTER ASD RELAY OUTPUT CIRCUIT OPEN PCM START PCM TEST ACTION APPLICABILITY 1 NOTE: Inspect the ASD Relay fuse located in the IPM. If the ASD Relay fuse t, erase the DTC. Attempt to start the engine. If the engine will not start, crank the engine for at least All Yes → Go To 2 No → Refer to the INTERMITTENT CONDITION symptom in the Driveability category. 2 Attempt to start the engine. All Yes → Go To 3 No → Go To 5 250 DRIVEABILITY - NGC |