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. |
| • | Use a scan tool to clear DTCs. |
| • | Interrupting PCM battery voltage may or may not clear DTCs. This practice is not recommended. Refer to Clearing Diagnostic Trouble Codes in Powertrain Control Module Description . |
Diagnostic Aids
This DTC is associated with an overheating/low coolant level condition. Refer to Engine Cooling for diagnosis.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Did you perform the Powertrain On-Board Diagnostic (OBD) System Check? | -- | Go to Step 2 | |
2 | Connect the scan tool. Are DTCs P0116, P0117 or P1114 also set? | -- | Go to DTCs that are set | Refer to Diagnostic Aids |
