P0533-A/C PRESSURE SENSOR CIRCUIT HIGH
For a complete wiring diagram Refer to Section 8W.
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 (C818) 5-VOLT SUPPLY CIRCUIT
|
(C918) A/C PRESSURE GROUND CIRCUIT OPEN
|
A/C PRESSURE TRANSDUCER
|
PCM
|
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.
(Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
Diagnostic Test
1.
A/C PRESSURE TRANSDUCER VOLTAGE ABOVE 4.9 VOLTS
NOTE:
Diagnose any CAN - C Communication DTCs before continuing.
NOTE:
Make sure the A/C refrigerant system is properly charged per Service Information.
Start the engine.
With a scan tool, read the A/C Pressure Sensor voltage.
Is the voltage above 4.9 volts?
Yes
No
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 (C918) Sensor Ground circuit in the Transducer harness connector.
Ignition on, engine not running.
With the scan tool, monitor the A/C Pressure Transducer voltage.
Is the voltage below 1.0 volt with the jumper wire installed?
Yes
No
3.
(C18) A/C PRESSURE SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE
Turn the ignition off.
Disconnect the C1 TIPM 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.
Is the voltage above 0 volts?
Yes
No
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 C1 TIPM harness connector.
Is the resistance below 5.0 ohms?
Yes
No
5.
(C18) A/C PRESSURE SIGNAL CIRCUIT SHORTED TO THE (C818) 5-VOLT SUPPLY CIRCUIT
Measure the resistance between the (C18) A/C Pressure Signal circuit and the (C818) 5-volt Supply circuit in the A/C Pressure Transducer harness connector.
Is the resistance below 5.0 ohms?
Yes
No
6.
(C918) SENSOR GROUND CIRCUIT OPEN
Measure the resistance of the (C918) Sensor Ground circuit from the A/C Pressure Sensor harness connector to the C1 TIPM harness connector.
Is the resistance below 5.0 ohms?
Yes
No
7.
TOTALLY INTEGRATED POWER MODULE
NOTE:
Before continuing, check the TIPM 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.
Were any problems found?
Yes
No