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

WARNING: This page is about a different car, the 2013 Ford F-550 Super Duty, 2013 Ford F-450 Super Duty, 2013 Ford F-350 Super Duty, and 2013 Ford F-250 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.
  1. L1 CHECK THE A/C SYSTEM PRESSURE 
    • Ignition OFF.
    • With the R-134a manifold gauge set connected, check the A/C system pressure.
    • Is the A/C system pressure above 290 kPa (42 psi)? 
  2. L2 CHECK THE A/C PRESSURE SENSOR (ACP_PRESS) PCM PID 
    • Ignition ON.
    • Enter the following diagnostic mode on the scan tool: PCM DataLogger.
    • With the manifold gauge set connected, compare the pressure readings of the manifold gauge set and the ACP_PRESS PCM PID.
    • Are the pressure values of the manifold gauge set and the ACP_PRESS PCM PID similar? 
    • Yes  : GO to L3.
    • No  : INSTALL a new A/C pressure transducer. TEST the system for normal operation.
  3. L3 CHECK THE A/C EVAPORATOR TEMPERATURE (EVAP_TEMP) HVAC PID 
    • Allow the vehicle exterior and interior to stabilize to the outside ambient temperature.
    • Enter the following diagnostic mode on the scan tool: HVAC DataLogger.
    • Monitor the EVAP_TEMP HVAC PID
    • Does the EVAP_TEMP HVAC PID read similar to the ambient temperature? 
  4. L4 CHECK THE A/C SWITCH (CC_SW_AC) HVAC PID WITH THE A/C ON 
    • Enter the following diagnostic mode on the scan tool: HVAC DataLogger.
    • Select PANEL press the A/C button (indicator on) on the HVAC controls and monitor the CC_SW_AC HVAC PID.
    • Does the CC_SW_AC HVAC PID read ON? 
    • Yes  : GO to  L6.
    • No  : For vehicles equipped with EMTC, GO to  L17.

      For vehicles equipped with DATC, GO to L5.

  5. L5 CHECK THE (A/C) SWITCH (CC_SW_AC) FCIM PID WITH THE A/C ON 
    • Enter the following diagnostic mode on the scan tool: FCIM DataLogger.
    • Select PANEL press the A/C button (indicator on) on the HVAC controls and monitor the CC_SW_AC FCIM PID.
    • Does the CC_SW_AC FCIM PID read Active? 
    • Yes  : GO to L6.
    • No  : INSTALL a new Front Controls Interface Module (FCIM). Refer to the appropriate Information and Entertainment Systems article for the procedure. TEST the system for normal operation.
  6. L6 CHECK THE AIR CONDITIONING REQUEST SIGNAL (AC_REQ) PCM PID WITH THE A/C ON 
    • Start the engine.
    • Enter the following diagnostic mode on the scan tool: PCM DataLogger.
    • Select PANEL press the A/C button (indicator on) on the HVAC controls and monitor the AC_REQ PCM PID.
    • Does the AC_REQ PCM PID read YES? 
    • Yes  : GO to L7.
    • No  : GO to  L17.
  7. L7 CHECK THE AIR CONDITIONING COMPRESSOR COMMANDED STATE (ACC_CMD) PCM PID WITH THE A/C ON 
    • Enter the following diagnostic mode on the scan tool: PCM DataLogger.
    • Select PANEL press the A/C button (indicator on) on the HVAC controls and monitor the ACC_CMD PCM PID.
    • Does the ACC_CMD PCM PID read ON? 
    • Yes  : GO to L8.
    • No  : GO to  L18.
  8. L8 CHECK THE VOLTAGE AT THE A/C COMPRESSOR CLUTCH FIELD COIL 
    • Ignition OFF.
    • Disconnect: A/C Compressor Clutch Field Coil C100.
    • Start the engine.
    • Select PANEL and A/C on the HVAC controls.
    • Measure the voltage between A/C compressor clutch field coil C100-1, circuit CH401 (VT/WH), harness side and ground.
      Fig 1: Checking Voltage At A/C Compressor Clutch Field Coil
      G06064573Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 11 volts? 
    • Yes  : GO to L9.
    • No  : CARRY OUT the A/C clutch relay component test. Refer to appropriate "OEM Wiring Diagrams Component Testing" article for component testing. If the relay tests OK, GO to  L12.
  9. L9 CHECK THE GROUND AT THE A/C COMPRESSOR CLUTCH FIELD COIL 
    • Ignition OFF.
    • Measure the resistance between A/C compressor clutch field coil C100-2, circuit GD124 (BK/VT) or GD122 (BK) (diesel), harness side and ground.
      Fig 2: Checking Ground At A/C Compressor Clutch Field Coil
      G06098588Courtesy of FORD MOTOR CO.
    • Is the resistance less than 3 ohms? 
    • Yes  : GO to L10.
    • No  : REPAIR the circuit.
  10. L10 CHECK THE A/C COMPRESSOR CLUTCH FIELD COIL 
    • Measure the resistance between the A/C compressor clutch field coil C100 terminals, component side.
    • Is the resistance 2-5 ohms? 
    • Yes  : GO to L11.
    • No  : INSTALL a new A/C compressor clutch field coil. REFER to CLIMATE CONTROL . TEST the system for normal operation.
  11. L11 CHECK THE A/C COMPRESSOR CLUTCH FIELD COIL FOR A SHORT TO GROUND 
    • Measure the resistance between the A/C compressor clutch field coil C100 terminals, component side and ground.
    • Is the resistance greater than 10, 000 ohms? 
  12. L12 CHECK THE VOLTAGE TO THE A/C CLUTCH RELAY SWITCH CONTACTS 
    • Ignition OFF.
    • Disconnect: A/C Clutch Relay.
    • Ignition ON.
    • Measure the voltage between A/C clutch relay socket, circuit SBB47 (WH/RD) and ground.
      Fig 3: Checking Voltage To A/C Clutch Relay Switch Contacts
      G07973744Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 11 volts? 
    • Yes  : GO to L13.
    • No  : VERIFY Battery Junction Box (BJB) fuse 47 (10A) is OK. If OK, REPAIR circuit SBB47 (WH/RD) for an open. TEST the system for normal operation. If not OK, REFER to the SYSTEM WIRING DIAGRAMS to identify the possible causes of the circuit short.
  13. L13 CHECK THE VOLTAGE TO THE A/C CLUTCH RELAY COIL 
    • Measure the voltage between A/C clutch relay socket, circuit CBB35 (YE/GY) and ground.
      Fig 4: Measuring Voltage Between A/C Clutch Relay Socket, Circuit CBB35 (YE/GY) And Ground
      G07484426Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 11 volts? 
    • Yes  : GO to L14.
    • No  : VERIFY Battery Junction Box (BJB) fuse 35 (10A) is OK. If OK, REPAIR circuit CBB35 (YE/GY) for an open. TEST the system for normal operation. If not OK, REFER to the SYSTEM WIRING DIAGRAMS to identify the possible causes of the circuit short.
  14. L14 CHECK THE A/C COMPRESSOR CLUTCH FIELD COIL VOLTAGE CIRCUIT FOR AN OPEN 
    • Measure the resistance between A/C clutch relay socket, circuit CH401 (VT/WH) and A/C compressor clutch field coil C100-1, circuit CH401 (VT/WH), harness side.
      Fig 5: Checking A/C Compressor Clutch Field Coil Voltage Circuit For Open
      G07973746Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10, 000 ohms? 
    • Yes  : GO to L15.
    • No  : REPAIR circuit CH401 (VT/WH) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  15. L15 CHECK THE A/C CLUTCH RELAY COIL SWITCHED GROUND CIRCUIT FOR A SHORT TO VOLTAGE 
    • Ignition OFF.
    • Disconnect: PCM C175B (Gasoline).
    • Disconnect: PCM C1232B (Diesel).
    • Ignition ON.
    • Measure the voltage between ground and PCM C175B-12, circuit CH302 (WH/BN), harness side.

      For gasoline engines 

      Fig 6: Checking A/C Clutch Relay Coil Switched Ground Circuit For Short To Voltage (For Gasoline Engines)
      G06098542Courtesy of FORD MOTOR CO.
    • Measure the voltage between ground and PCM C1232B-2, circuit CH302 (WH/BN), harness side.

      For diesel engines 

      Fig 7: Checking A/C Clutch Relay Coil Switched Ground Circuit For Short To Voltage (For Diesel Engines)
      G06133020Courtesy of FORD MOTOR CO.
    • Is any voltage present? 
    • Yes  : REPAIR the circuit.
    • No  : GO to L16.
  16. L16 CHECK THE A/C CLUTCH RELAY COIL SWITCHED GROUND CIRCUIT FOR AN OPEN 
    • Ignition OFF.
    • Measure the resistance between A/C clutch relay socket, circuit CH302 (WH/BN) and PCM C175B-12, circuit CH302 (WH/BN), harness side.

      For gasoline engines 

      Fig 8: Measuring Resistance Between A/C Clutch Relay Socket, Circuit CH302 (WH/BN) And PCM C175B-12, Circuit CH302 (WH/BN)
      G07484427Courtesy of FORD MOTOR CO.
    • Measure the resistance between A/C clutch relay socket, circuit CH302 (WH/BN) and PCM C1232B-2, circuit CH302 (WH/BN), harness side.

      For diesel engines 

      Fig 9: Measuring Resistance Between A/C Clutch Relay Socket, Circuit CH302 (WH/BN) And PCM C1232B-2, Circuit CH302 (WH/BN) - For Diesel Engines
      G07484428Courtesy of FORD MOTOR CO.
    • Is the resistance less than 3 ohms? 
    • Yes  : GO to L17.
    • No  : REPAIR the circuit.
  17. L17 CHECK FOR CORRECT HVAC MODULE OPERATION 
    • Ignition OFF.
    • Disconnect and inspect all HVAC module connectors.
    • Repair:
      • corrosion (install new connector or terminals - clean module pins)
      • damaged or bent pins - install new terminals/pins
      • pushed-out pins - install new pins as necessary
    • Connect all HVAC module connectors. Make sure they seat and latch correctly.
    • Clear the DTCs.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
    • Yes  : CHECK OASIS for any applicable TSBs. If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no TSB addresses this concern, INSTALL a new HVAC module. REFER to CLIMATE CONTROL
    • No  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.
  18. L18 CHECK FOR CORRECT PCM OPERATION 
    • Ignition OFF.
    • Disconnect and inspect all PCM connectors.
    • Repair:
      • corrosion (install new connector or terminals - clean module pins)
      • damaged or bent pins - install new terminals/pins
      • pushed-out pins - install new pins as necessary
    • Connect all PCM connectors. Make sure they seat and latch correctly.
    • Clear the DTCs.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
    • Yes  : CHECK OASIS for any applicable TSBs. If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no TSB addresses this concern, INSTALL a new PCM. REFER to ELECTRONIC ENGINE CONTROLS - GASOLINE ENGINES (gas engines) or ELECTRONIC ENGINE CONTROLS - DIESEL ENGINES (diesel).
    • No  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.
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