DTC P1388: ASD Relay Control Circuit: Description

Circuit is monitored with engine running and battery voltage more than 10 volts. DTC is set when an open or shorted condition is detected in Automatic Shutdown (ASD) relay control circuit. Possible causes for DTC to set are: ASD relay fused battery voltage circuit open, ASD relay resistance more than 100 ohms, ASD relay control circuit open, intermittent wiring harness failure, ASD relay control circuit shorted to ground or defective Powertrain Control Module (PCM).