2010 Cadillac Truck SRX AWD V6-3.0L Page 1551

2010 Cadillac Truck SRX AWD V6-3.0L Page 1551

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 00

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

P0533 00

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 (See: Heating and Air Conditioning/Diagrams/Electrical Diagrams)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views/Connector End Views By Name)

Description and Operation

Automatic HVAC Description and Operation (See: Heating and Air Conditioning/Description and Operation)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit

Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic

Procedures/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General

Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring

Repairs/Wiring Repairs)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the B1 A/C Refrigerant Pressure Sensor.

2. Ignition ON, test for 4.8-5.2V between the 5V reference circuit terminal 2 and ground.

瀚慖f less than the specified range, test the 5V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal,

replace K20 Engine Control Module.

瀚慖f greater than the specified range, test the 5V reference circuit for a short to voltage. If the circuit tests normal, replace the K20 Engine

Control Module.

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

瀚慖f less than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace K20 Engine

Control Module.

瀚慖f greater than the specified range, test the low reference circuit for a short to voltage. If the circuit tests normal, replace the K20 Engine