Pinpoint Test A: DTC P0532 Or P0533
Climate Control System
Pinpoint Tests
Pinpoint Test A: DTC P0532 or P0533
Refer to Wiring Diagram Set 24, Electronic Engine Controls - 4.6L for schematic and connector information. 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 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
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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 351 (BN/WH), harness side.
- Is the voltage between 4.7 and 5.1 volts?
Yes
GO to A2.
No
If the voltage is less than 4.7 volts, REPAIR circuit 351 (BN/WH) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
If the voltage is greater than 5.1 volts, REPAIR circuit 351 (BN/WH) for a short to voltage. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
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A2 CHECK THE PCM SENSOR GROUND
- Measure the voltage between A/C pressure transducer C1260-1, circuit 359 (GY/RD), harness side and A/C pressure transducer C1260-2, circuit 351 (BN/WH), 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 A6.
No
REPAIR circuit 359 (GY/RD) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
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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 C1260-3, circuit 1154 (WH/BK), harness side and A/C pressure transducer C1260-2, circuit 351 (BN/WH), 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.
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A4 CHECK CIRCUIT 1154 (WH/BK) FOR A SHORT TO GROUND
- Ignition OFF.
- Disconnect: PCM C175B.
- Measure the resistance between ground and A/C pressure transducer C1260-3, circuit 1154 (WH/BK), harness side.
- Is the resistance greater than 10,000 ohms?
Yes
GO to A5.
No
REPAIR circuit 1154 (WH/BK) for a short to ground. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
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A5 CHECK CIRCUIT 1154 (WH/BK) FOR AN OPEN
- Measure the resistance between A/C pressure transducer C1260-3, circuit 1154 (WH/BK), harness side and PCM C175B-26, circuit 1154 (WH/BK), harness side.
- Is the resistance less than 5 ohms?
Yes
GO to A8.
No
REPAIR circuit 1154 (WH/BK) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
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A6 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 1154 (WH/BK), harness side and A/C pressure transducer C1260-1, circuit 359 (GY/RD), 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 A7.
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A7 CHECK CIRCUIT 1154 (WH/BK) 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 1154 (WH/BK), harness side.
- Is any voltage present?
Yes
REPAIR circuit 1154 (WH/BK) for a short to voltage. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
No
GO to A7.
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A8 CHECK CIRCUIT 1154 (WH/BK) FOR A SHORT TO CIRCUIT 351 (BN/WH) OR 359 (GY/RD)
- Ignition OFF.
- NOTE: For DTC P0532 only.
- Measure the resistance between A/C pressure transducer C1260-3, circuit 1154 (WH/BK), harness side and A/C pressure transducer C1260-1, circuit 359 (GY/RD), harness side.
- NOTE: For DTC P0533 only.
- Measure the resistance between A/C pressure transducer C1260-3, circuit 1154 (WH/BK), harness side and A/C pressure transducer C1260-2, circuit 351 (BN/WH), harness side.
- Is the resistance greater than 10,000 ohms?
Yes
GO to A9.
No
REPAIR circuit 1154 (WH/BK) for a short to circuit 351 (BN/WH) or 359 (GY/RD). CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
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A9 CHECK THE PCM CONNECTION
- Clear the DTCs.
- Disconnect all the PCM connectors.
- Check for:
- corrosion.
- pushed-out pins.
- incorrectly seated connector.
- Connect and correctly seat all the PCM connectors.
- Operate the system.
- Does the concern return?
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.
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