P1388

Tests 1 - 3:

Tests 4 - 7:

SYMPTOM
P1388 - AUTO SHUTDOWN RELAY CONTROL CIRCUIT

WHEN MONITORED
With ignition key ON and battery voltage above 10.4 volts.

SET CONDITION
An open or shorted condition is detected in the ASD relay control circuit.

POSSIBLE CAUSES
- Wiring harness intermittent problem problem
- Fused B+ circuit open
- ASD relay control circuit open
- ASD relay control circuit shorted to ground
- ASD relay
- PCM