P0533

P0533-A/C PRESSURE SENSOR CIRCUIT HIGH





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 above the maximum 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 SHORTED TO VOLTAGE




Turn the ignition off.
Disconnect the A/C Pressure Transducer connector.
Disconnect the Body Control Module (BCM) 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 there any voltage present?

Yes

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

No

- Go to 3

3. (C18) A/C PRESSURE TRANSDUCER SIGNAL CIRCUIT SHORTED TO VOLTAGE




Measure the voltage of the (C18) A/C Pressure Transducer Signal circuit in the A/C Pressure Transducer harness connector.
Is there any voltage present?

Yes

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

No

- Go to 4

4. (C18) A/C PRESSURE TRANSDUCER SIGNAL CIRCUIT SHORTED TO THE (C818) A/C PRESSURE SENSOR SUPPLY CIRCUIT




Measure the resistance between the (C18) A/C Pressure Transducer Signal circuit and the (C818) A/C Pressure Sensor Supply in the A/C Pressure Transducer harness connector.
Is the resistance below 100 ohms?

Yes

- Repair the (C18) A/C Pressure Transducer Signal circuit for a short to the (C818) A/C Pressure Sensor Supply circuit.
- Perform the Body Verification Test Ver. 1 Body Verification Test

No

- Go to 5

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




Turn the ignition off.

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 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 6

No

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

6. (C918) SENSOR GROUND 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 (C918) Sensor Ground 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 7

No

- Repair the (C918) Sensor Ground circuit for an open circuit or high resistance.
- Perform the Body Verification Test Ver. 1 Body Verification Test

7. A/C PRESSURE TRANSDUCER




Turn the ignition off.
Connect the Body Control Module (BCM) connector.
Connect a jumper wire between the (C918) Sensor Ground circuit and the (C18) A/C Pressure Transducer Signal circuit in the A/C Pressure Transducer harness connector.
Turn the ignition on.
With the scan tool, read the A/C Pressure Transducer signal voltage.

NOTE: The sensor voltage should be approximately 0.0 volts (plus or minus.1 volt) with the jumper wire in place.

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 8

8. 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