P1539

CIRCUIT DESCRIPTION
The PCM will activate the A/C clutch relay when the PCM detects that A/C has been requested. When the PCM activates the relay, voltage should be present at both the A/C compressor clutch and the A/C compressor clutch supply voltage circuit at the PCM. If voltage is detected when A/C is not requested this DTC sets.

CONDITIONS FOR RUNNING THE DTC
The ignition is turned ON.

CONDITIONS FOR SETTING THE DTC
^ The PCM detects a voltage on the A/C compressor clutch supply voltage circuit when the A/C is not requested.
^ The condition is present for at least 20 seconds.

ACTION TAKEN WHEN THE DTC SETS
^ The PCM will not illuminate the Malfunction Indicator Lamp (MIL).
^ The PCM stores the failure records.
^ The A/C compressor clutch is disabled.

CONDITIONS FOR CLEARING THE DTC
^ The DTC will become history if the PCM no longer detects a failure.
^ The history DTC will clear after 40 fault free ignition cycles.
^ The DTC can be cleared with a scan tool.

TEST DESCRIPTION

Steps 1-8:

The numbers below refer to the step numbers on the diagnostic table.
3. Verifies the condition is present.
4. Determines if the A/C compressor clutch relay is at fault.
5. Determines if the PCM is at fault or the A/C compressor clutch supply voltage circuit is at fault.
7. Perform the recalibration procedure for the powertrain control module.