Chevrolet Trax: DTC P0532 OR P0533: Air conditioning (a/c) refrigerant
pressure sensor
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 the 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/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. The ECM may use this
information to turn the cooling
fans on as well as to monitor clutch engagement. The HVAC module will receive
the A/C refrigerant pressure
information from the ECM via serial data.
Conditions for Running the DTC
- Engine is running.
- Any of the conditions for setting the DTC are met for 15 s.
- Battery voltage is between 11-18 V.
Conditions for Setting the DTC
P0532
The ECM detects that the A/C pressure is less than 1 psi (0.25 V).
P0533
The ECM detects that the A/C pressure is more than 428 psi (4.92 V).
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.
Diagnostic Aids
A malfunction within the refrigerant system causing high pressure can cause
this DTC to set.
Reference Information
Schematic Reference
HVAC Schematics (Encore)
Connector End View Reference
WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS -
INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT
CONNECTOR END VIEWS - INDEX - TRAX
Description and Operation
Automatic HVAC Description and Operation
Electrical Information Reference
- Circuit Testing
- Connector Repairs
- Testing for Intermittent Conditions and Poor Connections
- Wiring Repairs
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (LUV) ,
Powertrain Diagnostic Trouble
Code (DTC) Type Definitions (2H0)
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
- Ignition ON
- Verify the scan tool engine control module A/C High Side Pressure
Sensor parameter is between 6.8 kPa
(1 psi) and 2950 kPa (428 psi).
- If not between 6.8 kPa (1 psi) and 2950 kPa (428 psi)
Refer to Circuit/System Testing
If between 6.8 kPa (1 psi) and 2950 kPa (428 psi)
- All OK
Circuit/System Testing
- Ignition OFF and all vehicle systems OFF, disconnect the harness
connector at the B1 A/C Refrigerant
Pressure Sensor. It may take up to 2 min for all vehicle systems to power
down.
- Test for less than 10 ohms between the low reference circuit terminal 1
and ground.
If 10 ohms or greater
- Ignition OFF, disconnect the harness connector at the K20 Engine Control
Module.
- Test for less than 2 ohms in the low reference circuit end to end.
- If 2 ohms or greater, repair the open/high resistance in the circuit.
- If less than 2 ohms, replace the K20 Engine Control Module.
If less than 10 ohms
- Ignition ON.
- Test for 4.8-5.2 V between the 5 V reference circuit terminal 2 and
ground.
If less than 4.8 V
- Ignition OFF, disconnect the harness connector at the K20 Engine Control
Module.
- 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
- Test for less than 2 ohms in the 5 V reference circuit end to end.
- If 2 ohms or greater, repair the open/high resistance in the circuit.
- If less than 2 ohms, replace the K20 Engine Control Module.
If greater than 5.2 V
- Ignition OFF, disconnect the harness connector at the K20 Engine Control
Module, ignition ON.
- Test for less than 1 V between the 5 V reference circuit and ground.
- If 1 V or greater, repair the short to voltage on the circuit.
- If less than 1 V, replace the K20 Engine Control Module.
If between 4.8-5.2 V
- Verify the scan tool A/C High Side Pressure Sensor parameter is less
than .25 V.
If .25 V or greater
- Ignition OFF, disconnect the harness connector at the K20 Engine Control
Module, ignition ON.
- Test for less than 1 V between the signal circuit terminal 3 and ground.
- If 1 V or greater, repair the short to voltage on the circuit.
- If less than 1 V, replace the K20 Engine Control Module.
If less than .25 V
- 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 4.8 V or less
- Ignition OFF, remove the jumper wire, disconnect the harness connector
at the K20 Engine Control
Module.
- Test for infinite resistance between the signal circuit terminal 3 and
ground.
- If less than infinite resistance, repair the short to ground on the
circuit.
- If infinite resistance
- Test for less than 2 ohms in the signal circuit end to end.
- If 2 ohms or greater, repair the open/high resistance in the circuit.
- If less than 2 ohms, replace the K20 Engine Control Module.
If greater than 4.8 V
- Test or replace the B1 A/C Refrigerant Pressure Sensor.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the repair.
- HVAC Component Replacement Reference
- Control Module References for engine control module replacement,
programming and setup
READ NEXT:
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.
Diag
NOTE: The following steps must be completed before using the
symptom tables:
Perform the Diagnostic System Check - Vehicle before using the HVAC
System Malfunction procedure
in order to verify t
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.
Diag
SEE MORE:
DIAGNOSTIC CODE INDEX
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 cate
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
D