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Pinpoint Test C: The Air Conditioning (A/C) Is Inoperative

WARNING: This page is about a different car, the 2007 Mercury Mariner and 2007 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
  1. C1 CHECK THE A/C CYCLING SWITCH PID WITH THE A/C ON 
    • Connect the diagnostic tool.
    • Key in ON position.
    • With the engine running, turn the function selector switch to the MAX A/C position.
    • Enter the following diagnostic mode on the diagnostic tool: PCM PIDs
    • Monitor the PCM A/C cycling switch PID.
    • Does the PCM A/C cycling switch PID read ON? 
    1. YES  : Go to  C3.
    2. NO  : Go to  C2.
  2. C2 CHECK THE REFRIGERANT PRESSURE 
    • Key in OFF position.
    • Connect the manifold set to the service ports.
    • Is the pressure 345-1,724 kPa (50-250 psi)? 
    1. YES  : Go to  C9.
    2. NO  : CHECK the system for refrigerant leaks. Refer to Electronic Leak Detection  or Fluorescent Dye Leak Detection .
  3. C3 CHECK CIRCUIT 321 (GY/WH) FOR POWER 
    • Disconnect: A/C Clutch Field Coil C100
    • Key in ON position.
    • Turn the function selector switch to MAX A/C position.
      • Fig 1: Checking Circuit For Voltage
      GF0025642Courtesy of FORD MOTOR CO.
    • Measure the voltage between A/C clutch field coil C100-a, circuit 321 (GY/WH), harness side and ground.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  C4.
    2. NO  : Go to  C5.
  4. C4 CHECK CIRCUIT 57 (BK) FOR AN OPEN 
    • Key in OFF position.
      • Fig 2: Checking Circuit For Open
      GF0025643Courtesy of FORD MOTOR CO.
    • Measure the resistance between A/C clutch field coil C100-b, circuit 57 (BK), harness side and ground.
    • Is the resistance less than 5 ohms? 
    1. YES  : INSTALL a new A/C clutch field coil. REFER to CLIMATE CONTROL article.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  5. C5 CHECK CIRCUIT 883 (PK/LB) FOR POWER 
    • Key in OFF position.
    • Disconnect: A/C Clutch Relay C1008
      • Fig 3: Checking Circuit For Voltage
      GF0025644Courtesy of FORD MOTOR CO.
    • Measure the voltage between A/C clutch relay C1008-3, circuit 883 (PK/LB), harness side and ground.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  C6.
    2. NO  : INSPECT battery junction box (BJB) fuse 14 (15A) for an open. If OK, REPAIR the circuit. TEST the system for normal operation.
  6. C6 CHECK CIRCUIT 361 (RD) FOR POWER 
    • Key in ON position.
      • Fig 4: Checking Circuit For Voltage
      GF0025645Courtesy of FORD MOTOR CO.
    • Measure the voltage between A/C clutch relay C1008-1, circuit 361 (RD), harness side and ground.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  C7.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  7. C7 CHECK THE A/C COMPRESSOR CLUTCH RELAY 
    • Carry out the A/C clutch relay component test. Refer to COMPONENT TESTING article.
    • Is the relay OK? 
    1. YES  : Go to  C8.
    2. NO  : INSTALL a new A/C clutch relay. TEST the system for normal operation.
  8. C8 CHECK CIRCUIT 331 (PK/YE) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: PCM C175b
      • Fig 5: Checking Circuit For Open
      GF0025646Courtesy of FORD MOTOR CO.
    • Measure the resistance between A/C clutch relay C1008-2, circuit 331 (PK/YE), harness side and PCM C175b-25, circuit 331 (PK/YE), harness side.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  C18.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  9. C9 CHECK CIRCUIT 198 (DG/OG) FOR POWER 
    • Disconnect: PCM C175b
    • Key in ON position.
    • Turn the function selector switch to the MAX A/C position.
      • Fig 6: Checking Circuit For Voltage
      GF0016007Courtesy of FORD MOTOR CO.
    • Measure the voltage between PCM C175b-15, circuit 198 (DG/OG), harness side and ground.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  C12.
    2. NO  : Go to  C10.
  10. C10 CHECK CIRCUIT 198 (DG/OG) FOR AN OPEN OR A SHORT TO GROUND 
    • Key in OFF position.
    • Disconnect: Dual Pressure Switch C1062
      • Fig 7: Checking Circuit For Open Or Short To Ground
      GF0025647Courtesy of FORD MOTOR CO.
    • Measure the resistance between dual pressure switch C1062-1, circuit 198 (DG/OG), harness side and PCM C175-15, circuit 198 (DG/OG), harness side; and between dual pressure switch C1062-1 circuit 198 (DG/OG), harness side and ground.
    • Is the resistance less than 5 ohms between the components, and greater than 10,000 ohms to ground? 
    1. YES  : Go to  C11.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  11. C11 CHECK CIRCUIT 441 (RD/YE) FOR POWER 
    • Key in ON position.
    • Turn the function selector switch to the MAX A/C position.
      • Fig 8: Checking Circuit For Voltage
      GF0025648Courtesy of FORD MOTOR CO.
    • Measure the voltage between dual pressure switch C1062-4, circuit 441 (RD/YE), harness side and ground.
    • Is the voltage greater than 10 volts? 
    1. YES  : INSTALL a new dual pressure switch. REFER to CLIMATE CONTROL article. TEST the system for normal operation.
    2. NO  : Go to  C14.
  12. C12 CHECK CIRCUIT 570 (BK/WH) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: Dual Pressure Switch C1062
      • Fig 9: Checking Circuit For Open
      GF0025649Courtesy of FORD MOTOR CO.
    • Measure the resistance between dual pressure switch C1062-3, circuit 570 (BK/WH), harness side and ground.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  C13.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  13. C13 CHECK CIRCUIT 347 (BK/YE) FOR AN OPEN OR A SHORT TO GROUND 
      Fig 10: Checking Circuit For Open Or Short To Ground
      GF0025650Courtesy of FORD MOTOR CO.
    • Measure the resistance between dual pressure switch C1062-2, circuit 347 (BK/YE), harness side and PCM C175b-26, circuit 347 (BK/YE), harness side; and between dual pressure switch C1062-2 circuit 347 (BK/YE), harness side and ground.
    • Is the resistance less than 5 ohms between the components, and greater than 10,000 ohms to ground? 
    1. YES  : Go to  C14.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  14. C14 CHECK CIRCUIT 348 (VT) FOR POWER 
    • Key in OFF position.
    • Disconnect: A/C Cycling Switch C130
    • Key in ON position.
      • Fig 11: Checking Circuit For Voltage
      GF0004335Courtesy of FORD MOTOR CO.
    • Measure the voltage between A/C cycling switch C130-1, circuit 348 (VT), harness side and ground.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  C15.
    2. NO  : Go to  C16.
  15. C15 CHECK CIRCUIT 441 (RD/YE) FOR AN OPEN OR A SHORT TO GROUND 
    • Key in OFF position.
      • Fig 12: Checking Circuit For Open Or Short To Ground
      GF0025651Courtesy of FORD MOTOR CO.
    • Measure the resistance between dual pressure switch C1062-4, circuit 441 (RD/YE), harness side and the A/C cycling switch C130-4, circuit 441 (RD/YE), harness side; and between dual pressure switch C1062-4 circuit 441 (RD/YE), harness side and ground.
    • Is the resistance less than 5 ohms between the components, and greater than 10,000 ohms to ground? 
    1. YES  : INSTALL a new A/C cycling switch. REFER to CLIMATE CONTROL article. TEST the system for normal operation.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  16. C16 CHECK CIRCUIT 348 (VT) FOR AN OPEN OR A SHORT TO GROUND 
    • Key in OFF position.
      • Fig 13: Checking Circuit For Open Or Short To Ground
      GF0025652Courtesy of FORD MOTOR CO.
    • Measure the resistance between function selector switch C294a-4, circuit 348 (VT), harness side and A/C cycling switch C130-1, circuit 348 (VT), harness side; and between function selector switch C294a-4 circuit 348 (VT), harness side and ground.
    • Is the resistance less than 5 ohms between the components, and greater than 10,000 ohms to ground? 
    1. YES  : Go to  C17.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  17. C17 CHECK FOR POWER TO THE FUNCTION SELECTOR SWITCH 
    • Key in OFF position.
    • Disconnect: Function Selector Switch C294a
    • Key in ON position.
      • Fig 14: Checking Circuit For Voltage
      GF0025653Courtesy of FORD MOTOR CO.
    • Measure the voltage between function selector switch C294a-2, circuit 41 (BK/LB), harness side and ground.
    • Is the voltage greater than 10 volts? 
    1. YES  : INSTALL a new function selector switch. REFER to CLIMATE CONTROL article. TEST the system for normal operation.
    2. NO  : INSPECT smart junction box (SJB) fuse 26 (5A) for an open. If OK, REPAIR the circuit. TEST the system for normal operation.
  18. C18 CHECK FOR CORRECT PCM OPERATION 
    • Disconnect all PCM connectors.
    • Check for:
      • corrosion.
      • pushed-out pins.
    • Connect all PCM connectors and make sure they seat correctly.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
    1. YES  : INSTALL a new PCM. REFER to ELECTRONIC ENGINE CONTROLS - 2.3L article or ELECTRONIC ENGINE CONTROLS - 3.0L (4V) article. 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. CLEAR the DTCs. REPEAT the self-test.
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