P0530

DTC P0530, P0532, or P0533 (LX9/LZ9)

Circuit Description

The powertrain control module (PCM) or engine control module (ECM) monitors the high side refrigerant pressure through the A/C refrigerant pressure sensor. The PCM/ECM 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/ECM 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/ECM commands the cooling fans on. When pressure is too high or too low, the PCM/ECM 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 High or Low Voltage
* 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 ignition is ON.

Conditions for Setting the DTC

All of the following conditions exist for 15 seconds.

* The PCM/ECM detects that the A/C pressure is 9 psi or less (0.20 volts).
* The PCM/ECM detects that the A/C pressure is more than 453 psi (4.92 volts).

P0530

The PCM/ECM detects a too low or too high signal on the A/C refrigerant pressure sensor signal circuit.

P0532

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

P0533

The PCM/ECM detects a high signal on the A/C refrigerant pressure sensor signal circuit.

Action Taken When the DTC Sets

* The PCM/ECM will not illuminate the malfunction indicator lamp (MIL)
* The PCM/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 can be cleared by using the scan tool.
* The DTC will become history if the PCM/ECM 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.

* Refer to Testing for Intermittent Conditions and Poor Connections in Diagnostic Aids. Component Tests and General Diagnostics

Test Description

Step 1 - Step 8:

Step 9 - Step 17:

The numbers below refer to the step numbers on the diagnostic table.
4 This step tests for the proper operation of the circuit in the low voltage range.
5. This step 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. This step tests for a short to voltage in the 5-volt reference circuit.
7. This step tests for a high resistance or an open in the low reference circuit.