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

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.
NOTE: Before carrying out the following test, diagnose any HVAC, PCM or IC  DTCs.
NOTE: Before carrying out the following test, check that the A/C system pressure is above 290 kPa (42 psi). If the pressure is below 290 kPa (42 psi), refer to FLUORESCENT DYE LEAK DETECTION .
  1. K1 CHECK THE A/C PRESSURE SENSOR (ACP_PRESS) PCM PID 
    • Ignition ON.
    • Enter the following diagnostic mode on the scan tool: ACP_PRESS PCM PID.
    • With the manifold gauge set connected, compare the pressure readings of the manifold gauge set and the ACP_PRESS PID.
    • Are the pressure values of the manifold gauge set and the ACP_PRESS PID similar? 
    • Yes:  Electronic Manual Temperature Control (EMTC) systems, GO to  K3.

      Dual Automatic Temperature Control (DATC) systems, GO to K2  .

    • No:  INSTALL a new A/C pressure transducer. TEST the system for normal operation. If the condition returns, GO to  K11.
  2. K2 CHECK THE AIR CONDITIONING SWITCH STATUS (AC_SEL_SW) HVAC PID WITH THE A/C ON 
    • Enter the following diagnostic mode on the scan tool: AC_SEL_SW HVAC PID.
    • Press the PANEL manual override button and press the A/C button (indicator on) on the HVAC module - DATC  .
    • Does the AC_SEL_SW HVAC PID read A/C? 
    • Yes:  GO to K3  .
    • No:  GO to  K10.
  3. K3 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: EVAP_TEMP HVAC PID.
    • Does the EVAP_TEMP HVAC PID read similar to the ambient temperature? 
    • Yes:  GO to K4  .
    • No:  INSTALL a new evaporator discharge temperature sensor. TEST the system for normal operation. If the condition returns, GO to  K10.
  4. K4 CHECK THE AIR CONDITIONING COMPRESSOR COMMANDED STATE (ACC_CMD) PCM PID WITH THE A/C ON 
    • Start the engine.
    • Enter the following diagnostic mode on the scan tool: ACC_CMD PCM PID.
    • Does the ACC_CMD PCM PID read ON? 
    • Yes:  GO to  K6.
    • No:  GO to K5  .
  5. K5 CHECK THE AIR CONDITIONING COMPRESSOR CYCLING SWITCH (ACCS) PCM PID WITH THE A/C ON 
    • Enter the following diagnostic mode on the scan tool: ACCS PCM PID.
    • Press the PANEL and A/C manual override buttons (A/C indicator ON) on the HVAC module - DATC  or select MAX A/C on the HVAC module - EMTC  .
    • Does the ACCS PCM PID read ON? 
    • Yes:  GO to  K11.
    • No:  GO to  K10.
  6. K6 CHECK THE VOLTAGE AT THE A/C COMPRESSOR CLUTCH FIELD COIL 
    • Ignition OFF.
    • Disconnect: A/C Compressor Clutch Field Coil C100.
    • Start the engine.
    • Press the PANEL and A/C manual override buttons (A/C indicator ON) on the HVAC module - DATC  or select MAX A/C on the HVAC module - EMTC  .
    • Measure the voltage between ground and A/C compressor clutch field coil C100-1, circuit CH401 (VT/WH), harness side.
      Fig 1: Checking Voltage At A/C Compressor Clutch Field Coil
      G06064573Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    • Yes:  GO to  K8.
    • No:  CARRY OUT the A/C clutch relay component test.

      Refer to COMPONENT TESTING -- GASOLINE MODELS for component testing.

      CHECK the A/C clutch diode. INSTALL a new diode if necessary. If the relay tests OK, GO to K7  .

  7. K7 CHECK THE A/C CLUTCH RELAY FOR VOLTAGE 
    • Ignition OFF.
    • Disconnect: A/C Clutch Relay.
    • Ignition ON.
    • Measure the voltage between ground and the A/C clutch relay socket, circuit SBB13 (GY/RD).
      Fig 2: Checking A/C Clutch Relay For Voltage
      G06098587Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    • Yes:  REPAIR circuit CH401 (VT/WH) for an open. TEST the system for normal operation.
    • No:  VERIFY BJB  fuse 13 (10A) is OK. If OK, REPAIR circuit SBB13 (GY/RD) for an open. TEST the system for normal operation. If not OK, REFER to the appropriate SYSTEM WIRING DIAGRAMS article to identify the possible causes of the circuit short.
  8. K8 CHECK THE GROUND AT THE A/C COMPRESSOR CLUTCH FIELD COIL 
    • Ignition OFF.
    • Measure the resistance between ground and A/C compressor clutch field coil C100-2, circuit GD120 (BK/GN), harness side.
      Fig 3: Measuring Resistance Between Ground And A/C Compressor Clutch Field Coil C100-2
      G06098588Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes:  GO to K9  .
    • No:  REPAIR circuit GD120 (BK/GN) for an open. TEST the system for normal operation.
  9. K9 CHECK THE A/C COMPRESSOR CLUTCH AIR GAP 
    • Measure the A/C compressor clutch air gap at 3 equally spaced locations between the clutch hub and the A/C compressor clutch pulley.
      Fig 4: Checking A/C Clutch Air Gap Between Clutch Plate And A/C Clutch Pulley
      G06098589Courtesy of FORD MOTOR CO.
    • Is the A/C compressor clutch air gap greater than 0.6 mm (0.024 in)? 
  10. K10 CHECK THE HVAC MODULE CONNECTION 
    • Inspect the module connectors for:
      • corrosion.
      • pushed-out terminals.
      • damaged terminals.
    • Connect and correctly seat all the HVAC module connectors.
    • Clear the DTCs.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
    • Yes:  INSTALL a new HVAC module. REFER to CLIMATE CONTROL . 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. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  11. K11 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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