With Automatic AC

DTC P0532

CIRCUIT DESCRIPTION
The powertrain control module (PCM) monitors the high side refrigerant pressure through the A/C refrigerant pressure sensor. The PCM supplies a 5-volt reference and a low reference to the sensor. Changes in the A/C refrigerant pressure cause the A/C refrigerant pressure sensor signal to the PCM to vary. When the pressure is high, the signal voltage is high. When the pressure is low, the signal voltage is low. When pressure is high, the PCM commands the cooling fans on. When pressure is too high or too low, the PCM will not allow the A/C compressor clutch to engage. This vehicle has DTCs which include DTC Symptoms. For more information on DTC Symptoms, refer to Symptoms - Vehicle in Vehicle DTC Information.

DTC DESCRIPTORS
This diagnostic procedure supports the following DTCs.
- DTC P0532 Air Conditioning (A/C) Refrigerant Pressure Sensor Circuit Low Voltage

CONDITIONS FOR RUNNING THE DTC
The ignition is ON.

CONDITIONS FOR SETTING THE DTC
All of the following conditions exist for 15 seconds.
- The PCM detects that the A/C pressure is 9 psi or less (0.20 volts).
- The PCM detects that the A/C pressure is more than 453 psi (4.92 volts).

P0532: The PCM detects a low signal on the A/C refrigerant pressure sensor signal circuit.

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 history DTC will clear after 40 consecutive ignition cycles have occurred without a malfunction.
- The DTC can be cleared by using the scan tool.
- The DTC will become history if the ECM/PCM no longer detects a failure.

DIAGNOSTIC AIDS
Test the following conditions:
- Visually inspect the sensor for contamination or damage.
- Inspect for the following that may affect the sensors accuracy:
- A malfunction within the refrigerant system causing high pressure.
- Visually inspect the A/C components and lines for damage.

TEST DESCRIPTION

Steps 1-2:

Steps 3-4:

Steps 5-7:

Steps 8-13:

Steps 14-17:

The numbers below refer to the step numbers on the diagnostic table.
4. Tests for the proper operation of the circuit in the low voltage range.
5. Tests for the proper operation of the circuit in the high voltage range. If the fuse in the jumper opens when you perform this test, the signal circuit is shorted to ground.
6. Tests for a short to voltage in the 5-volt reference circuit.
7. Tests for a high resistance or an open in the low reference circuit.