Pinpoint Test A: DTC P0532 or P0533
Climate Control System
Pinpoint Test A: DTC P0532 or P0533
Refer to Wiring Diagram Set 23, Electronic Engine Controls - 2.3L for schematic and connector information. [1][2]Diagrams By Number
Refer to Wiring Diagram Set 24, Electronic Engine Controls - 3.0L for schematic and connector information. [1][2]Diagrams By Number
Refer to Wiring Diagram Set 25, Electronic Engine Controls - 3.5L 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 through circuit RE407 (YE/VT). A 5-volt reference voltage is supplied to the A/C pressure transducer from the PCM through circuit LE424 (YE/GN). The A/C pressure transducer sends voltage to the PCM through circuit VH433 (VT/OG) to indicate the A/C pressure.
- DTC P0532 (A/C Pressure Refrigerant Sensor A Circuit Low)- The A/C pressure transducer inputs a voltage to the PCM. If the voltage is below the calibrated level, this DTC sets.
- DTC P0533 (A/C Pressure Refrigerant Sensor A Circuit High)- The A/C pressure transducer inputs a voltage to the PCM. If the voltage is above the calibrated level, this DTC sets.
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 C1260-2, circuit LE424 (YE/GN), harness side.
Is the voltage between 4.7 and 5.1 volts?
Yes
GO to A2.
No
REPAIR circuit LE424 (YE/GN) for an open. 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 RE407 (YE/VT), harness side and A/C pressure transducer C1260-2, circuit LE424 (YE/GN), 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 RE407 (YE/VT) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
A3 CHECK THE A/C PRESSURE TRANSDUCER HIGH
- Enter the following diagnostic mode on the scan tool: A/C Pressure (ACP_PRESS) PCM PID.
- While observing the ACP_PRESS PCM PID, connect a fused jumper between A/C pressure transducer C2160-3, circuit VH433 (VT/OG), harness side and A/C pressure transducer C1260-2, circuit LE424 (YE/GN), harness side.
Does the ACP_PRESS 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: PCM C175B.
- Measure the resistance between ground and A/C pressure transducer C1260-3, circuit VH433 (VT/OG), harness side.
Is the resistance greater than 10,000 ohms?
Yes
GO to A7.
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 THE A/C PRESSURE TRANSDUCER HIGH
- Enter the following diagnostic mode on the scan tool: A/C Pressure (ACP_PRESS) PCM PID.
- While observing the ACP_PRESS PCM PID, connect a fused jumper between A/C pressure transducer C1260-3, circuit VH433 (VT/OG), harness side and A/C pressure transducer C1260-1, circuit RE407 (YE/VT), harness side.
Does the ACP_PRESS 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 A6.
A6 CHECK CIRCUIT VH433 (VT/OG) FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: PCM C175B.
- Ignition ON.
- Measure the voltage between ground and A/C pressure transducer C1260-3, 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 A7.
A7 CHECK CIRCUIT VH433 (VT/OG) FOR A SHORT TO CIRCUIT LE424 (YE/GN) OR RE407 (YE/VT)
- Ignition OFF.
- NOTE: For DTC P0532 only.
Measure the resistance between A/C pressure transducer C1260-3, circuit VH433 (VT/OG), harness side and A/C pressure transducer C1260-1, circuit RE407 (YE/VT), harness side.
- NOTE: For DTC P0533 only.
Measure the resistance between A/C pressure transducer C1260-3, circuit VH433 (VT/OG), harness side and A/C pressure transducer C1260-2, circuit LE424 (YE/GN), harness side.
Is the resistance greater than 10,000 ohms?
Yes
GO to A8.
No
REPAIR circuit VH433 (VT/OG) for a short to circuit LE424 (YE/GN) or RE407 (YE/VT). CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
A8 CHECK CIRCUIT VH433 (VT/OG) FOR AN OPEN
- For 2.5L and 3.0L only, measure the resistance between A/C pressure transducer C1260-3, circuit VH433 (VT/OG), harness side and PCM C175B-31, circuit VH433 (VT/OG), harness side.
- For 3.5L only, measure the resistance between A/C pressure transducer C1260-3, circuit VH433 (VT/OG), harness side and PCM C175B-63, circuit VH433 (VT/OG), harness side.
Is the resistance less than 5 ohms?
Yes
GO to A9.
No
REPAIR circuit VH433 (VT/OG) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
A9 CHECK THE PCM CONNECTION
- Disconnect all the PCM connectors.
- Inspect the 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.