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Home >> Mercury >> 2008 >> Milan Base, 3.0 1, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1681 (HVAC - Climate Control System - General Information And Diagnostics) >> Diagnostic Tests >> Climate Control System >> Pinpoint Tests >> Pinpoint Test A: DTC P0532 or P0533 >> Pinpoint Test A: DTC P0532 Or P0533

Pinpoint Test A: DTC P0532 Or P0533

WARNING: This page is about a different car, the 2010 Lincoln Town Car. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: When disconnecting and reconnecting the pressure transducer electrical connector, make sure that the connector-locking device is in place and that the locking device and connector are correctly and fully seated.
  1. A1 CHECK THE PCM OUTPUT VOLTAGE 
    • Key in OFF position.
    • Disconnect: A/C Pressure Transducer C1260
    • Key in ON position.
      • Fig 1: Measuring Voltage
      GF0041538Courtesy of FORD MOTOR CO.
    • 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? 
    1. YES  : Go to  A2.
    2. NO  : REPAIR circuit 351 (BN/WH) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  2. A2 CHECK THE PCM SENSOR GROUND 
      Fig 2: Measuring Voltage
      GF0041539Courtesy of FORD MOTOR CO.
    • 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? 
    1. YES  : If diagnosing DTC P0532  , go to  A3. If diagnosing DTC P0533  , go to  A5.
    2. NO  : REPAIR circuit 359 (GY/RD) 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 diagnostic tool: A/C Pressure (ACP_PRESS) PCM PID
      • Fig 3: Checking A/C Pressure Transducer High
      GF0041540Courtesy of FORD MOTOR CO.
    • 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? 
    1. YES  : INSTALL a new A/C pressure transducer. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
    2. NO  : Go to  A4.
  4. A4 CHECK CIRCUIT 1154 (WH/BK) FOR A SHORT TO GROUND 
    • Key in OFF position.
    • Disconnect: PCM C175b
      • Fig 4: Measuring Resistance
      GF0041541Courtesy of FORD MOTOR CO.
    • 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? 
    1. YES  : Go to  A7.
    2. NO  : REPAIR circuit 1154 (WH/BK) 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 diagnostic tool: A/C Pressure (ACP_PRESS) PCM PID
      • Fig 5: Connecting A Fused Jumper Between A/C Cycling Switch C130-4 And C130-1
      GF0038262Courtesy of FORD MOTOR CO.
    • 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? 
    1. YES  : INSTALL a new A/C pressure transducer. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
    2. NO  : Go to  A6.
  6. A6 CHECK CIRCUIT 1154 (WH/BK) FOR A SHORT TO VOLTAGE 
    • Key in OFF position.
    • Disconnect: PCM C175b
    • Key in ON position.
      • Fig 6: Measuring Voltage
      GF0041542Courtesy of FORD MOTOR CO.
    • Measure the voltage between ground and A/C pressure transducer C1260-3, circuit 1154 (WH/BK), harness side.
    • Is any voltage present? 
    1. YES  : REPAIR circuit 1154 (WH/BK) for a short to voltage. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
    2. NO  : Go to  A7.
  7. A7 CHECK CIRCUIT 1154 (WH/BK) FOR A SHORT TO CIRCUIT 351 (BN/WH) OR 359 (GY/RD) 
    • Key in OFF position.
      • Fig 7: Measuring Resistance
      GF0041543Courtesy of FORD MOTOR CO.
      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.
      • Fig 8: Measuring Resistance
      GF0041544Courtesy of FORD MOTOR CO.
      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? 
    1. YES  : Go to  A8.
    2. 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.
  8. A8 CHECK CIRCUIT 1154 (WH/BK) FOR AN OPEN 
      Fig 9: Measuring Resistance
      GF0047604Courtesy of FORD MOTOR CO.
    • 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? 
    1. YES  : Go to  A9.
    2. NO  : REPAIR circuit 1154 (WH/BK) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  9. 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? 
    1. YES  : INSTALL a new PCM. TEST the system for normal operation.
    2. 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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