P0532

P0532-A/C PRESSURE SENSOR CIRCUIT LOW

For a complete wiring diagram Consult Diagrams/Electrical

- When Monitored:
With the ignition on and battery voltage greater than 10.4 volts.

- Set Condition:
The PCM detects that the A/C Pressure Transducer input voltage is below the minimum acceptable value.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.Initial Inspection and Diagnostic Overview

Diagnostic Test

1. DTC IS ACTIVE
Start the engine and allow it to reach normal operating temperature.

WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in personal injury or death.

NOTE: Diagnose and repair any system voltage or sensor supply voltage DTCs before continuing with this test.

With the scan tool, select View DTCs.
Is the status Active for this DTC?

Yes

- Go to 2

No

- REFER TO the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure.Checking For An Intermittent DTC

2. (C818) A/C PRESSURE SENSOR SUPPLY CIRCUIT VOLTAGE

Turn the ignition off.
Disconnect the A/C Pressure Transducer connector.
Turn the ignition on.
Measure the voltage of the (C818) A/C Pressure Sensor Supply circuit in the A/C Pressure Transducer harness connector.
Is the voltage above 4.5 volts?

Yes

- Go to 6

No

- Go to 3

3. (C818) A/C PRESSURE SENSOR SUPPLY CIRCUIT SHORTED TO GROUND

Turn the ignition on.
Disconnect the Body Control Module (BCM) connector.
Measure the resistance between ground and the (C818) A/C Pressure Sensor Supply circuit in the A/C Pressure Transducer harness connector.
Is the resistance above 100 ohms?

Yes

- Go to 4

No

- Repair the (C818) A/C Pressure Sensor Supply circuit for a short to ground.
- Perform the Body Verification Test Ver. 1 Body Verification Test

4. (C818) A/C PRESSURE SENSOR SUPPLY CIRCUIT SHORTED TO (C918) SENSOR GROUND CIRCUIT

Measure the resistance between the (C818) A/C Pressure Sensor Supply circuit and the (C918) Sensor Ground circuit in the A/C Pressure Transducer harness connector.
Is the resistance above 100 ohms?

Yes

- Go to 5

No

- Repair the (C818) A/C Pressure Sensor Supply circuit for a short to the (C918) Sensor Ground circuit.
- Perform the Body Verification Test Ver. 1 Body Verification Test

5. (C818) A/C PRESSURE SENSOR SUPPLY CIRCUIT OPEN OR HIGH RESISTANCE

Turn the ignition off.
Disconnect the Body Control Module (BCM) connector.
Measure the resistance between ground and the (C18) A/C Pressure Transducer Signal circuit in the A/C Pressure Transducer harness connector.
Is the resistance above 100 ohms?

Yes

- Go to 7

No

- Repair the (C18) A/C Pressure Transducer Signal circuit for a short to ground.
- Perform the Body Verification Test Ver. 1 Body Verification Test

7. (C18) A/C PRESSURE TRANSDUCER SIGNAL CIRCUIT SHORTED TO (C918) SENSOR GROUND CIRCUIT

Measure the resistance between the (C18) A/C Pressure Transducer Signal circuit and the (C918) Sensor Ground circuit in the A/C Pressure Transducer harness connector.
Is the resistance above 100 ohms?

Yes

- Go to 8

No

- Repair the (C18) A/C Pressure Transducer Signal circuit for a short to the (C918) Sensor Ground circuit.
- Perform the Body Verification Test Ver. 1 Body Verification Test

8. (C18) A/C PRESSURE TRANSDUCER SIGNAL CIRCUIT OPEN OR HIGH RESISTANCE

CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals, resulting in poor terminal to pin connection. Install Miller Special Tool #8815 to perform diagnosis.

Measure the resistance of the (C18) A/C Pressure Transducer Signal circuit between the A/C Pressure Transducer harness connector and the appropriate terminal of special tool #8815.
Is the resistance below 5.0 ohms?

Yes

- Go to 9

No

- Repair the (C18) A/C Pressure Transducer Signal circuit for an open circuit or high resistance.
- Perform the Body Verification Test Ver. 1 Body Verification Test

9. A/C PRESSURE TRANSDUCER
Turn the ignition off.
Connect the Body Control Module (BCM) connector.
Turn the ignition on.
With the scan tool, read the A/C Pressure Transducer signal voltage.

NOTE: The sensor voltage should be approximately 5.0 volts (plus or minus.1 volt) with the connector disconnected.

Does the scan tool display the voltage as described above?

Yes

- Replace the A/C Pressure Transducer.
- Perform the Body Verification Test Ver. 1 Body Verification Test

No

- Go to 10

10. BODY CONTROL MODULE (BCM)
Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the A/C Pressure Transducer and the Body Control Module (BCM).
Look for any chafed, pierced, pinched, or partially broken wires.
Look for broken, bent, pushed out or corroded terminals.
Monitor the scan tool data relative to this circuit and wiggle test the wiring and connectors.
Look for the data to change or for the DTC to reset during the wiggle test.
Search for any Technical Service Bulletins that may apply.
Were any problems found?

Yes

- Repair as necessary.
- Perform the Body Verification Test Ver. 1 Body Verification Test

No

- Replace and program the Body Control Module (BCM).
- Perform the Body Verification Test Ver. 1 Body Verification Test