P1536

Diagnostic Chart:

CIRCUIT DESCRIPTION

This diagnostic test monitors the ECT sensor for a high engine temperature condition. If a high engine temperature condition exists it will either disable A/C compressor if engaged or not allow compressor operation if requested during the high engine temperature condition. After the diagnostic test fails and is set current it uses a lower temperature cutoff point to ensure that the A/C system won't be a load on the cooling system during conditions of high engine temperature.

CONDITIONS FOR RUNNING THE DTC

DTCs P0117, P0118 not set.

CONDITIONS FOR SETTING THE DTC

^ A/C Compressor operation requested by HVAC controller.

^ Coolant temperature is greater than 125°C (257°F).

^ DTC P1536 not current.

OR

^ A/C Compressor operation requested or not requested by HVAC controller.

^ Coolant temperature greater than 120°C (248°F).

^ DTC P1536 current.

ACTION TAKEN WHEN THE DTC SETS

^ A/C compressor is disengaged.

^ The Malfunction Indicator Lamp (MIL) will not illuminate.

^ The PCM will command a message to be displayed.

^ The PCM may record operating conditions at the time the diagnostic fails. This information will be stored in the Failure Records.


CONDITIONS FOR CLEARING THE MESSAGE/DTC

^ The PCM will turn the message OFF after one run and pass of the diagnostic test.

^ A History DTC will clear after forty consecutive warm-up cycles with no failures of any non-emission related diagnostic test.

^ A Last Test Failed (current) DTC will clear when the diagnostic runs and does not fail.

^ PCM battery voltage is interrupted.

^ Using a Scan tool.


DIAGNOSTIC AIDS

This DTC is associated with an overheating/low coolant level condition. Refer to cooling system for diagnosis.