Buick Regal: 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 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
- DTCs P0532 and P0533 are Type B DTCs
- 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 Wiring Schematics
Connector End View Reference
Component Connector End View Index
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
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
1. Ignition ON.
2. 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
- Go to next step: If between 6.8 kPa (1 psi) and 2950 kPa (428 psi)
3. All OK
Circuit/System Testing
1. 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.
2. Test for less than 10 Ω between the low reference circuit terminal 1 and
ground.
- Ignition OFF, disconnect the harness connector at the K20 Engine Control
Module.
- 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.
- Go to next step: If less than 10 Ω
3. Ignition ON.
4. Test for 4.8 - 5.2 V between the 5 V reference circuit terminal 2 and ground.
- 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.
- Go to next step: If infinite resistance
- 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.
- 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.
- Go to next step: If between 4.8 - 5.2 V
5. Verify the scan tool A/C High Side Pressure Sensor parameter is less
than.25 V.
- 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.
- Go to next step: If less than.25 V
6. Install a 3 A fused jumper wire between the signal circuit terminal 3 and
the 5 V reference circuit
terminal 2.
7. Verify the scan tool A/C High Side Pressure Sensor parameter is greater than
4.8 V.
- 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.
- Go to next step: If infinite resistance
- 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.
- Go to next step: If greater than 4.8 V
8. 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:
1. Perform the Diagnostic System Check - Vehicle before using the HVAC System
Malfunction
procedure in order to verify th
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 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 Descriptor
DT
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 Descriptor
DT