P0533

P0533-A/C PRESSURE SENSOR CIRCUIT HIGH (ESP)

P0533 - A/C Pressure Sensor Circuit High (ESP):

WHEN MONITORED
Engine running and the AC Clutch Relay energized.

SET CONDITION
The A/C pressure transducer signal at the PCM goes above 4.92 volts for more than 2.6 seconds. One trip Fault. Three good trips to turn off the MIL.

POSSIBLE CAUSES
- (C18) A/C pressure signal circuit shorted to battery voltage
- (C18) A/C pressure signal circuit open
- (C18) A/C pressure signal circuit shorted to the (K301) 5-volt supply circuit
- (K310) sensor ground circuit open
- A/C pressure transducer
- CAN C BUS circuit open or shorted
- BCM
- PCM

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.

DIAGNOSTIC TEST

1. A/C PRESSURE TRANSDUCER VOLTAGE ABOVE 4.9 volts

NOTE:
- Diagnose any CAN C Bus Communication DTCs before continuing.
- Make sure the A/C refrigerant System is properly charged.

Start the engine.
With a scan tool, read the A/C Pressure Sensor voltage.

Q: Is the voltage above 4.9 volts?

YES: Go To 2
NO: Refer to the INTERMITTENT CONDITION Diagnostic Procedure. Component Tests and General Diagnostics
Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test

2. A/C PRESSURE TRANSDUCER




Turn the ignition off.
Disconnect the A/C Pressure Transducer harness connector.
Connect a jumper wire between the (C18) A/C Pressure Signal circuit and the (K310) Sensor ground circuit in the Transducer harness connector.
Ignition on, engine not running.
With the scan tool, monitor the A/C Pressure Transducer voltage.

Q: Is the voltage below 1.0 volt with the jumper wire installed?

YES: Replace the A/C Pressure Transducer.
Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test
NO: Go To 3

NOTE: Remove the jumper wire before continuing.

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




Turn the ignition off.
Disconnect the C2 BCM harness connector.
Ignition on, engine not running.
Measure the voltage on the (C18) A/C Pressure Signal circuit in the A/C Pressure Transducer harness connector.

Q: Is the voltage above 5.2 volts?

YES: Repair the short to battery voltage in the (C18) A/C Pressure Signal circuit.
Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test
NO: Go To 4

4. (C18) A/C PRESSURE SIGNAL CIRCUIT OPEN




Turn the ignition off.
Measure the resistance of the (C18) A/C Pressure Signal circuit from the A/C Pressure Transducer harness connector to the C2 BCM harness connector.

Q: Is the resistance below 5.0 ohms?

YES: Go To 5
NO: Repair the open in the (C18) A/C Pressure Signal circuit.
Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test

5. (C18) A/C PRESSURE SIGNAL CIRCUIT SHORTED TO THE (K301) 5-VOLT SUPPLY CIRCUIT




Measure the resistance between the (C18) A/C Pressure Signal circuit and the (K301) 5-volt Supply circuit in the A/C Pressure Transducer harness connector.

Q: Is the resistance below 5.0 ohms?

YES: Repair the short between the (K301) 5-volt Supply circuit and the (C18) A/C Pressure Signal circuit.
Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test
NO: Go To 6

6. (K310) SENSOR GROUND CIRCUIT OPEN




Disconnect the C2 BCM harness connector.
Measure the resistance of the (K310) Sensor ground circuit from the A/C Pressure Sensor harness connector to the C2 BCM harness connector.

Q: Is the resistance below 5.0 ohms?

YES: Go To 7
NO: Repair the open in the (K310) Sensor ground circuit
Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test

7. BCM

NOTE: Before continuing, check the BCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.

Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.

Q: Were there any problems found?

YES: Repair as necessary.
Perform the BODY VERIFICATION TEST. Body Verification Test
NO: Replace and program the Body Control Module.
Perform the BODY VERIFICATION TEST. Body Verification Test