P0533
Climate Control System
Pinpoint Test A: DTC P0532 or P0533
Refer to Wiring Diagram Set 54, Manual Climate Control System for schematic and connector information [1][2]Diagrams By Number.
Refer to Wiring Diagram Set 55, Automatic Climate Control System for schematic and connector information [1][2]Diagrams By Number.
Normal Operation
Under normal operation, the A/C pressure transducer receives a ground from the PCM. A 5-volt reference voltage is supplied to the A/C pressure transducer from the PCM. The A/C pressure transducer then sends a voltage to the PCM to indicate the A/C pressure.
- DTC P0532 (A/C Refrigerant Pressure Sensor A Circuit Low)- The A/C pressure transducer inputs a feedback voltage to the PCM. This DTC will set if the feedback voltage is less than 0.26 volts for at least 2 seconds and the ambient air temperature is greater than 0°C (32°F).
- DTC P0533 (A/C Refrigerant Pressure Sensor A Circuit High)- The A/C pressure transducer inputs a feedback voltage to the PCM. This DTC will set if the feedback voltage is greater than 4.95 volts for at least 2 seconds and the ambient air temperature is greater than 0°C (32°F).
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- A/C pressure transducer
- PCM
PINPOINT TEST A : DTC P0532 OR P0533
A1 CHECK THE PCM OUTPUT VOLTAGE
- Ignition OFF.
- Disconnect: A/C Pressure Transducer C1260.
- Ignition ON.
- Measure the voltage between ground and A/C pressure transducer C1260-3, circuit LE423 (GN/VT), harness side.
Is the voltage between 4.7 and 5.1 volts?
Yes
GO to A2.
No
If the voltage is below 4.7 volts, REPAIR circuit LE423 (GN/VT) for an open or high resistance. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
If the voltage is greater than 5.1 volts REPAIR circuit LE423 (GN/VT) for a short to voltage. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
A2 CHECK THE PCM SENSOR GROUND
- Measure the voltage between A/C pressure transducer C1260-1, circuit RE405 (GN/WH), harness side and A/C pressure transducer C1260-3, circuit LE423 (GN/VT), harness side.
Is the voltage between 4.7 and 5.1 volts?
Yes
If diagnosing DTC P0532, GO to A3. If diagnosing DTC P0533, GO to A5.
No
REPAIR circuit RE405 (GN/WH) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
A3 CHECK THE A/C PRESSURE SENSOR (ACP_V) PCM PID WITH THE A/C PRESSURE TRANSDUCER DISCONNECTED
- Enter the following diagnostic mode on the scan tool: ACP_V PCM PID.
- Observing the ACP_V PCM PID voltage.
Does the ACP_V PCM PID voltage read greater than 4 volts?
Yes
INSTALL a new A/C pressure transducer. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
No
GO to A4.
A4 CHECK CIRCUIT VH433 (VT/OG) FOR A SHORT TO GROUND
- Ignition OFF.
- Disconnect: (5.0L, 5.4L) PCM C175B.
- Disconnect: (3.7L) PCM C1381B.
- Measure the resistance between ground and A/C pressure transducer C1260-2, circuit VH433 (VT/OG), harness side.
Is the resistance greater than 10,000 ohms?
Yes
GO to A5.
No
REPAIR circuit VH433 (VT/OG) for a short to ground. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
A5 CHECK CIRCUIT VH433 (VT/OG) FOR AN OPEN
- Measure the resistance between A/C pressure transducer C1260-2, circuit VH433 (VT/OG), harness side and:
- For 5.0L and 5.4L, PCM C175B-31, circuit VH433 (VT/OG), harness side.
- For 3.7L, PCM C1381B-31, circuit VH433 (VT/OG), harness side.
Is the resistance less than 5 ohms?
Yes
GO to A8.
No
REPAIR circuit VH433 (VT/OG) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
A6 CHECK THE A/C PRESSURE SENSOR (ACP_V) PCM PID WITH THE A/C PRESSURE TRANSDUCER SHORTED
- Enter the following diagnostic mode on the scan tool: ACP_V PCM PID.
- While observing the ACP_V PCM PID, connect a fused jumper between A/C pressure transducer C1260-2, circuit VH433 (VT/OG), harness side and A/C pressure transducer C1260-1, circuit RE405 (GN/WH), harness side.
Does the ACP_V PCM PID voltage read less than 4.9 volts?
Yes
INSTALL a new A/C pressure transducer. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
No
GO to A7.
A7 CHECK CIRCUIT VH433 (VT/OG) FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: (5.0L, 5.4L) PCM C175B.
- Disconnect: (3.7L) PCM C1381B.
- Ignition ON.
- Measure the voltage between ground and A/C pressure transducer C1260-2, circuit VH433 (VT/OG), harness side.
Is any voltage present?
Yes
REPAIR circuit VH433 (VT/OG) for a short to voltage. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
No
GO to A9.
A8 CHECK CIRCUIT VH433 (VT/OG) FOR A SHORT TO CIRCUIT RE405 (GN/WH)
- Ignition OFF.
- Measure the resistance between A/C pressure transducer C1260-2, circuit VH433 (VT/OG), harness side and A/C pressure transducer C1260-1, circuit RE405 (GN/WH), harness side.
Is the resistance greater than 10,000 ohms?
Yes
GO to A10.
No
REPAIR circuit VH433 (VT/OG) for a short to circuit RE405 (GN/WH). CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
A9 CHECK CIRCUIT VH433 (VT/OG) FOR A SHORT TO CIRCUIT LE423 (GN/VT)
- Ignition OFF.
- Measure the resistance between A/C pressure transducer C1260-2, circuit VH433 (VT/OG), harness side and A/C pressure transducer C1260-3, circuit LE423 (GN/VT), harness side.
Is the resistance greater than 10,000 ohms?
Yes
GO to A10.
No
REPAIR circuit VH433 (VT/OG) for a short to circuit LE423 (GN/VT). CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
A10 CHECK THE PCM CONNECTION
- Disconnect all the PCM connectors.
- Inspect the HVAC module connectors for:
- corrosion.
- pushed-out terminals.
- damaged terminals.
- Connect and correctly seat all the PCM connectors.
- Clear the DTCs.
- Operate the system and verify the concern is still present.
Is the concern still present?
Yes
INSTALL a new PCM. TEST the system for normal operation.
No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.