No ASD Relay Output Sensed at PCM

Name of Code:
No Auto Shutdown (ASD) Relay Output Voltage At PCM

When Monitored:
With the ignition key on and battery voltage greater than 10 volts.

Set Condition:
No voltage sensed at the powertrain control module when the auto shutdown relay is energized.

Theory of Operation:
When the ASD relay is energized, the relay contacts connect the fused B(+) circuit to the relay output circuit. The powertrain control module is connected in parallel with the ASD relay output circuit. This connection provides the PCM with a circuit to monitor the ASD relay output state. Whenever the PCM energizes the ASD relay, it checks the feedback circuit to ensure voltage is present at the ASD relay output. If voltage is not present, a trouble code is set.

Possible Causes:
- ASD relay output circuit open
- Fused B(+) circuit open
- ASD relay
- Failed PCM
- Connector terminals
- Connector wires