Diagnostic Instructions
DTC Descriptors
DTC P0532: Air Conditioning (A/C) Refrigerant Pressure Sensor Circuit Low Voltage
DTC P0533: Air Conditioning (A/C) Refrigerant Pressure Sensor Circuit High Voltage
Diagnostic Fault Information
Circuit
| Short to Ground
| Open/High Resistance
| Short to Voltage
| Signal Performance
|
A/C Compressor Clutch Feedback
| P1546
| P1546
| P1539
| --
|
Circuit/System Description
The A/C compressor clutch relay is monitored by the ECM/PCM through the A/C compressor clutch relay feedback circuit.
Conditions for Running the DTC
| • | Any of the conditions for setting the DTC are met for 15 seconds. |
| • | Battery voltage is between 11-18 volts. |
Conditions for Setting the DTC
The ECM/PCM detects that the A/C compressor clutch is not on after an A/C request has been made.
Action Taken When the DTC Sets
| • | The ECM will not illuminate the malfunction indicator lamp (MIL) |
| • | The ECM stores the Failure Records. |
| • | The A/C compressor clutch is disabled. |
Conditions for Clearing the DTC
| • | The history DTC will clear after 40 consecutive ignition cycles have occurred without a malfunction. |
| • | The DTC will become history if the ECM no longer detects a failure. |
Reference Information
Schematic Reference
HVAC Schematics
Connector End View Reference
HVAC Connector End Views
Description and Operation
Electrical Information Reference
Scan Tool Reference
Circuit/System Testing
- Ignition OFF, disconnect the A/C compressor clutch relay.
- Ignition ON, verify that a test lamp does not illuminate between the relay coil control circuit terminal 85 and ground.
| ⇒ | If the test lamp illuminates, test the control circuit for a short to voltage. |
- Verify that a test lamp illuminates between the relay coil ignition circuit terminal 86 and ground.
| ⇒ | If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance. If the circuit tests normal and the ignition circuit fuse/breaker is open, test or replace the A/C compressor clutch relay. |
- Connect a test lamp between the relay coil ignition circuit terminal 86 and the relay coil control circuit terminal 85.
- Command the A/C relay ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
| ⇒ | If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, ECM/PCM. |
| ⇒ | If the test lamp is always OFF, test the control circuit for a short to voltage, or an open/high
resistance. If the circuit tests normal, replace the ECM/PCM. |
- If all circuits test normal, test or replace the A/C compressor clutch relay.
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic procedure.
