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DTC B0193 > < DTC B0468 or B0470-B0472

Astra J

DTC P0532 or P0533

Diagnostic Instructions

•  Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
•  Review Strategy Based Diagnosis for an overview of the diagnostic approach.
•  Diagnostic Procedure Instructions provides an overview of each diagnostic category.

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

5V Reference
P0532
P0532
-
-

Refrigerant Pressure Sensor Signal
P0532
P0532
P0533
-

Low Reference
-
P0532
-
-
 

Circuit/System Description

The engine control module (ECM) monitors the high side refrigerant pressure through the A/C refrigerant pressure sensor. The ECM supplies a 5 V reference and a low reference to the sensor. Changes in the A/C refrigerant pressure cause the sensor signal to the 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 ECM commands the cooling fans on. When pressure is too high or too low, the ECM will not allow the activation of the A/C compressor.

Conditions for Running the DTC

Engine is running.

Conditions for Setting the DTC

P0532

The ECM detects a short to ground or open at the A/C pressure sensor signal circuit.

P0533

The ECM detects a short to voltage at the A/C pressure sensor signal circuit.

Action Taken When the DTC Sets

•  The A/C compressor is disabled.
•  The ECM will illuminate the malfunction indicator lamp (MIL).

Conditions for Clearing the DTC

The condition for setting the DTC is no longer present.

Reference Information


Schematic Reference

HVAC Schematics


Connector End View Reference

Component Connector End Views


Description and Operation

Manual HVAC Description and Operation


Electrical Information Reference


Scan Tool Reference

Control Module References for scan tool information

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the B1 A/C Refrigerant Pressure Sensor, ignition ON.
2. Test for 4.8-5.2 V between the 5 V reference circuit terminal 2 and ground.
    ⇒  If less than 4.8 V

  2.1 Ignition OFF, disconnect the harness connector at the K20 Engine Control Module.
  2.2 Test for infinite resistance between the 5 V reference circuit and ground.
⇒  If less than infinite resistance, repair the short to ground on the circuit.
⇓  If infinite resistance
  2.3 Test for less than 2 Ω in the 5 V reference circuit end to end.
⇒  If 2 Ω or greater, repair the open/high resistance in the circuit.
⇒  If less than 2 Ω, replace the K20 Engine Control Module.
    ⇒  If greater than 5.2 V

  2.1 Ignition OFF, disconnect the harness connector at the K20 Engine Control Module, ignition ON.
  2.2 Test for less than 0.3 V between the 5 V reference circuit and ground.
⇒  If greater than 0.3 V, repair the short to voltage on the circuit.
⇒  If less than 0.3 V, replace the K20 Engine Control Module.
    ⇓  If within 4.8-5.2 V

3. Test for 4.8-5.2 V between the 5 V reference circuit terminal 2 and the low reference circuit terminal 1.
    ⇒  If less than 4.8 V

  3.1 Ignition OFF, disconnect the harness connector at the K20 Engine Control Module.
  3.2 Test for less than 2 Ω in the low reference circuit end to end.
⇒  If 2 Ω or greater, repair the open/high resistance in the circuit.
⇒  If less than 2 Ω, replace the K20 Engine Control Module.
    ⇒  If greater than 5.2 V

  3.1 Ignition OFF, disconnect the harness connector at the K20 Engine Control Module.
  3.2 Ignition ON, test for less than 0.3 V between the low reference circuit and ground.
⇒  If greater than 0.3 V, repair the short to voltage on the circuit.
⇒  If less than 0.3 V, replace the K20 Engine Control Module.
    ⇓  If within 4.8-5.2 V

4. Verify the scan tool A/C High Side Pressure Sensor parameter is less than 0.3 V.
    ⇒  If greater than 0.3 V

  4.1 Ignition OFF, disconnect the harness connector at the K20 Engine Control Module, ignition ON.
  4.2 Test for less than 0.3 V between the signal circuit terminal 3 and ground.
⇒  If greater than 0.3 V, repair the short to voltage on the circuit.
⇒  If less than 0.3 V, replace the K20 Engine Control Module.
    ⇓  If less than 0.3 V

5. Install a 3 A fused jumper wire between the signal circuit terminal 3 and the 5 V reference circuit terminal 2. Verify the scan tool A/C High Side Pressure Sensor parameter is greater than 4.8 V.
    ⇒  If less than 4.8 V

  5.1 Ignition OFF, disconnect the harness connector at the K20 Engine Control Module.
  5.2 Test for infinite resistance between the signal circuit and ground.
⇒  If less than infinite resistance, repair the short to ground on the circuit.
⇓  If infinite resistance
  5.3 Test for less than 2 Ω in the signal circuit end to end.
⇒  If 2 Ω or greater, repair the open/high resistance in the circuit.
⇒  If less than 2 Ω, replace the K20 Engine Control Module.
    ⇓  If greater than 4.8 V

6. Replace the B1 A/C Refrigerant Pressure Sensor.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

•  Control Module References for engine control module (ECM) replacement, programming and setup

DTC B0193 > < DTC B0468 or B0470-B0472