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Pinpoint Test A: DTC P0532 Or P0533

WARNING: This page is about a different car, the 2010 Mercury Milan, 2010 Lincoln MKZ, and 2010 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
  1. 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.
      Fig 1: Measuring Voltage Between Ground & A/C Pressure Transducer C1260-2, Circuit LE424 (YE/GN), Harness Side
      G06262508Courtesy of FORD MOTOR CO.
    • 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.
  2. 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.
      Fig 2: Checking PCM Sensor Ground
      G06262509Courtesy of FORD MOTOR CO.
    • 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.
  3. 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.
      Fig 3: Checking A/C Pressure Transducer High
      G06262510Courtesy of FORD MOTOR CO.
    • 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.
  4. 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.
      Fig 4: Measuring Resistance Between Ground & A/C Pressure Transducer C1260-3, Circuit VH433 (VT/OG), Harness Side
      G06262511Courtesy of FORD MOTOR CO.
    • 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.
  5. 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.
      Fig 5: Checking A/C Pressure Transducer High
      G06262512Courtesy of FORD MOTOR CO.
    • 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.
  6. 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.
      Fig 6: Measuring Voltage Between Ground & A/C Pressure Transducer C1260-3, Circuit VH433 (VT/OG), Harness Side
      G06262513Courtesy of FORD MOTOR CO.
    • 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.
  7. A7 CHECK CIRCUIT VH433 (VT/OG) FOR A SHORT TO CIRCUIT LE424 (YE/GN) OR RE407 (YE/VT) 
    • Ignition OFF.
    • 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 P0532 only.
      Fig 7: Checking VH433 (VT/OG) For Short To Circuit LE424 (YE/GN) Or RE407 (YE/VT) - For DTC P0532 Only
      G06262514Courtesy of FORD MOTOR CO.
    • 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.
      NOTE: For DTC P0533 only.
      Fig 8: Checking VH433 (VT/OG) For Short To Circuit LE424 (YE/GN) Or RE407 (YE/VT) - For DTC P0533 Only
      G06262515Courtesy of FORD MOTOR CO.
    • 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.
  8. 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.
      Fig 9: Checking Circuit VH433 (VT/OG) For Open (For 2.5L & 3.0L Only)
      G06262516Courtesy of FORD MOTOR CO.
    • 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.
      Fig 10: Checking Circuit VH433 (VT/OG) For Open (For 3.5L Only)
      G06262517Courtesy of FORD MOTOR CO.
    • 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.
  9. 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.
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