P1388

Tests 536 - 541:

Tests 542 - 543:

SYMPTOM
P1388 - AUTO SHUTDOWN RELAY CONTROL CIRCUIT

WHEN MONITORED
With ignition key ON and battery voltage above 10 volts.

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

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