P1388

Tests 1 - 2:

Tests 3 - 6:

Tests 7 - 8:

SYMPTOM
P1388-AUTO SHUT DOWN RELAY CONTROL CIRCUIT

WHEN MONITORED
With ignition ON Battery voltage above 10 volts.

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

POSSIBLE CAUSES
- ASD relay intermittent operation
- Intermittent condition
- Fused B+ circuit
- ASD relay resistance
- ASD relay control circuit open
- ASD relay control circuit short to ground
- PCM