Pinpoint Test A: DTC P0532 Or P0533

WARNING: This page is about a different car, the 2010 Mercury Mariner and 2010 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.

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 And A/C Pressure Transducer C1260-2, Circuit LE424 (YE/GN) Harness Side
  Courtesy of FORD MOTOR CO.
- 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 LE424 (YE/GN) 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 LE424 (YE/GN) 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 RE407 (YE/VT), harness side and A/C pressure transducer C1260-2, circuit LE424 (YE/GN), harness side.
  
  Fig 2: Measuring Voltage Between A/C Pressure Transducer C2160-1 And A/C Pressure Transducer C1260-2
  Courtesy 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 A6.
- 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 C1260-3, circuit VH433 (VT/OG), harness side and A/C pressure transducer C1260-2, circuit LE424 (YE/GN), harness side.
  
  Fig 3: Connecting Fused Jumper Between A/C Pressure Transducer C1260-3 And A/C Pressure Transducer C1260-2
  Courtesy 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 .
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 And A/C Pressure Transducer C1260-3, Circuit VH433 (VT/OG) Harness Side
  Courtesy of FORD MOTOR CO.
- 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 C1260-3, circuit VH433 (VT/OG), harness side and PCM C175B-31, circuit VH433 (VT/OG), harness side.
  
  Fig 5: Measuring Resistance Between A/C Pressure Transducer C1260-3 And PCM C175B-31
  Courtesy of FORD MOTOR CO.
- 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 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 6: Checking A/C Pressure Transducer High
  Courtesy 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 A7 .
A7 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 7: Measuring Voltage Between Ground And A/C Pressure Transducer C1260-3, Circuit VH433 (VT/OG) Harness Side
  Courtesy 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 A8 .
A8 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.
  
  Fig 8: Measuring Resistance Between A/C Pressure Transducer C1260-3 And A/C Pressure Transducer C1260-1
  Courtesy 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.
  
  Fig 9: Measuring Resistance Between A/C Pressure Transducer C1260-3 And A/C Pressure Transducer C1260-2
  Courtesy of FORD MOTOR CO.
- Is the resistance greater than 10,000 ohms?
- Yes: GO to A9 .
- 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.
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.