P1546

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DTC P1546 A/C Compressor Clutch Output Circuit Malfunction




Circuit Description
The Powertrain Control Module (PCM) controls the A/C Compressor Clutch Solenoid through the use of a relay and a control (ground) circuit. If the PCM commands the A/C Compressor Clutch Solenoid ON but the voltage remains High (12 volts); or, if the PCM commands the A/C Compressor Clutch Solenoid OFF but the voltage remains Low (0 volts), then DTC P1546 will set. DTC P1546 is a type D code.

Conditions for Setting the DTC
- Ignition voltage is greater than 10 volts.
- Engine run time is greater than 32 seconds.
The above mentioned conditions are met and one of the following two conditions are met for 25 seconds within a 50 second test sample.
- PCM senses voltage is High with the A/C Compressor Clutch Solenoid commanded ON. OR
- PCM senses voltage is Low with the A/C Compressor Clutch Solenoid commanded OFF.

Action Taken When the DTC Sets
- The PCM will not illuminate the Malfunction Indicator Lamp (MIL).
- The PCM will store the conditions that were present when the DTC was set as Freeze Frame and in Failure Records.

Conditions for Clearing the DTC
- A history DTC will clear after 40 consecutive trips without a reported failure.
- The DTC can be cleared using the Scan Tool's "Clear Info" function.

Diagnostic Aids
- Poor connections, or a damaged harness - Inspect the harness connectors for: backed-out terminals, improper mating or damaged terminals. Also check for open circuits, shorts to ground, and shorts to voltage.