P0532

DTC P0532

CIRCUIT DESCRIPTION
The engine control module (ECM) or powertrain control module (PCM) monitors the high side refrigerant pressure through the A/C refrigerant pressure sensor. The ECM/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 ECM/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 ECM/PCM commands the cooling fans on. When pressure is too high or too low, the ECM/PCM will not allow the A/C compressor clutch to engage.

DTC DESCRIPTORS
This diagnostic procedure supports the following DTCs:
- DTC P0530 Air Conditioning (A/C) Refrigerant Pressure Sensor Circuit
- 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
- Engine is running.
- Battery voltage is between 11-18 volts.

CONDITIONS FOR SETTING THE DTC
- The ECM/PCM detects that the A/C pressure is less than 0 psi (0.01 volts).
- The ECM/PCM detects that the A/C pressure is more than 446 psi (4.94 volts).

P0530
- The ECM/PCM detects a too high or too low signal on the A/C refrigerant pressure sensor signal circuit.
- The ECM/PCM has received an A/C request from the BCM over serial data with A/C sensor voltage greater than 4.94 volts (446 psi).
- The ECM/PCM is not receiving an A/C request from the BCM over serial data with A/C refrigerant pressure sensor voltage greater than 4 volts (358 psi).
- Conditions for setting the DTC are met for 15 seconds.

P0532
- The ECM/PCM detects a low signal on the A/C refrigerant pressure sensor signal circuit.
- Conditions for setting the DTC are met for longer than 3 seconds.

P0533
- The ECM/PCM detects a high signal on the A/C refrigerant pressure sensor signal circuit.
- Conditions for setting the DTC are met for longer than 3 seconds.

ACTION TAKEN WHEN THE DTC SETS
- The ECM/PCM will not illuminate the malfunction indicator lamp (MIL).
- The ECM/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 - 8:

Steps 9 - 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.