P0532
DTC P0532
CIRCUIT DESCRIPTION
The air conditioning (A/C) refrigerant pressure sensor is used by the engine control module (ECM) to monitor the high side refrigerant pressure. The A/C refrigerant pressure sensor utilizes the following 3 circuits:
- A 5-volt reference circuit
- A low reference circuit
- A signal circuit
The ECM monitors the signal circuit voltage. If the A/C high side pressure is high, the signal voltage is high. If the A/C high side pressure is low, the signal voltage is low. The ECM uses the voltage readings to determine the operation of the A/C compressor and the cooling fans. If the ECM detects an excessively high or low signal voltage, a DTC sets.
DTC DESCRIPTORS
This diagnostic procedure supports the following DTCs:
- DTC P0532 Air Conditioning (A/C) Refrigerant Pressure Sensor Circuit Low Voltage
- DTC P0533 Air Conditioning (A/C) Refrigerant Pressure Sensor Circuit High Voltage
CONDITIONS FOR RUNNING THE DTC
- The engine is running.
- The A/C is requested.
- DTC P0532 and P0532 run continuously once the above condition is met.
CONDITIONS FOR SETTING THE DTC
P0532
- The ECM detects that the A/C pressure is less than 0.1 volt.
- The condition exists for more than 10 seconds.
P0533
- The ECM detects that the A/C pressure is more than 4.9 volts.
- The condition exists for more than 10 seconds.
ACTION TAKEN WHEN THE DTC SETS
- The control module stores the DTC information into memory when the diagnostic runs and fails.
- The malfunction indicator lamp (MIL) will not illuminate.
- The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Failure Records.
- The driver information center, if equipped, may display a message.
CONDITIONS FOR CLEARING THE DTC
- A current DTC Last Test Failed clears when the diagnostic runs and passes.
- A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other non-emission related diagnostic.
- Clear the DTC with a scan tool.
DIAGNOSTIC AIDS
- For HVAC system concerns, refer to HVAC Preliminary Checks. Initial Inspection and Diagnostic Overview
- For an intermittent condition, refer to Testing for Intermittent Conditions and Poor Connections. Component Tests and General Diagnostics
TEST
Step 1 - Step 7:
Step 8 - Step 15:
