P1388 Auto Shutdown Relay Control Circuit

SYMPTOM
P-1388 AUTO SHUTDOWN RELAY CONTROL CIRCUIT

WHEN MONITORED
With ignition key on and battery voltage greater than 10.4 volts.

POSSIBLE CAUSES
- Fused ignition output circuit open
- Wiring and connectors observably defective
- Wiring harness intermittently defective
- Auto shutdown relay defective
- ASD relay control circuit short to ground
- Auto shutdown relay control circuit open
- Powertrain control module defective (ASD rly ctrl ckt)