2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 2121

2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 2121

* Control Module References (See: Testing and Inspection/Programming and Relearning) for the ECM replacement, setup, and programming

HVAC - Manual

DTC P0532 or P0533

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/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/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-volt 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 A/C compressor clutch to engage.

Conditions for Running the DTC

* Engine is running.

* Any of the conditions for setting the DTC are met for 15 seconds.

* Battery voltage is between 11-18 volts.

Conditions for Setting the DTC

* The ECM detects that the A/C pressure is less than 1 psi (0.01 volt) sets DTC P0532.

* The ECM detects that the A/C pressure is more than 428 psi (4.92 volts) sets DTC P0533.

Action Taken When the DTC Sets

* The ECM will not illuminate the malfunction indicator lamp (MIL).

* The 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 will become history if the ECM no longer detects a failure.

Diagnostic Aids

A malfunction within the refrigerant system causing high pressure can cause this DTC to set.

Reference Information

Schematic Reference

HVAC Schematics (See: Heating and Air Conditioning/Diagrams/Electrical Diagrams/HVAC - Manual)

Connector End View Reference