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Home >> Ford >> 2006 >> Focus ZX5 SE, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 704 (Climate Control System - General Information And Diagnostics - F-150 & Mark LT) >> Diagnostic Tests >> Climate Control System >> Pinpoint Tests >> Pinpoint Test J: The Air Conditioning (A/C) is Always On >> Pinpoint Test J: The Air Conditioning (A/C) Is Always On

Pinpoint Test J: The Air Conditioning (A/C) Is Always On

WARNING: This page is about a different car, the 2007 Lincoln Mark LT and 2007 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: It is important to install relays in their correct position in the battery junction box (BJB). Installing a relay incorrectly can cause wiring shorts or damage to modules. While carrying out diagnostics on BJB relays, have only one BJB relay removed at a time. Failure to follow these instructions may result in damage to the vehicle circuitry or to control modules.
NOTE: Before carrying out the following test, diagnose any PCM or instrument cluster DTCs.
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. J1 CHECK THE A/C PRESSURE SENSOR (ACP_PRESS) PCM PID 
    • Key in ON position.
    • Enter the following diagnostic mode on the diagnostic tool: ACP_PRESS PCM PID
    • 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? 
    1. YES  : Go to  J2.
    2. NO  : INSTALL a new A/C pressure transducer. TEST the system for normal operation.
  2. J2 CHECK WIDE OPEN THROTTLE A/C CUT-OFF FAULT (WAC_F) PCM PID WITH THE A/C OFF 
    • Key in ON position.
    • With the engine running, press the OFF manual override button on the HVAC module - EATC or select the OFF position on the HVAC module - EMTC.
    • Enter the following diagnostic mode on the diagnostic tool: WAC_F PCM PID
    • Does the WAC_F PCM PID read YES? 
    1. YES  : REPAIR circuit 331 (PK/YE). TEST the system for normal operation.
    2. NO  : HVAC module - EATC systems, go to  J3.

      EMTC systems, go to  J4.

  3. J3 CHECK AIR CONDITIONING SWITCH STATUS (AC_SEL_SW) HVAC PID WITH THE A/C OFF 
    • Enter the following diagnostic mode on the diagnostic tool: AC_SEL_SW HVAC PID
    • Does the AC_SEL_SW HVAC PID read ON? 
    1. YES  : Go to  J10.
    2. NO  : Go to  J6.
  4. J4 CHECK THE EMTC A/C SIGNAL WITH THE A/C OFF 
    • Key in OFF position.
    • Disconnect: Instrument Cluster C2206
    • Key in ON position.
    • Select the OFF position on the HVAC module - EMTC.
    • Measure the resistance between instrument cluster C220b-2, circuit 348 (VT), harness side and ground.
      • Fig 1: Checking EMTC A/C Signal With A/C Off
      GF0004333Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  J5.
    2. NO  : Go to  J6.
  5. J5 CHECK CIRCUIT 348 (VT) FOR A SHORT TO GROUND 
    • Key in OFF position.
    • Disconnect: HVAC Module - EMTC C294a
    • Measure the resistance between instrument cluster C220b-2, circuit 348 (VT), harness side and ground.
      • Fig 2: Checking Circuit 348 (VT) For Short To Ground
      GF0004333Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : Go to  J10.
    2. NO  : REPAIR circuit 348 (VT) for a short to ground. TEST the system for normal operation.
  6. J6 CHECK THE AIR CONDITIONING COMPRESSOR CYCLING SWITCH (ACCS) PCM PID WITH THE A/C OFF 
    • Enter the following diagnostic mode on the diagnostic tool: ACCS PCM PID
    • Does the ACCS PCM PID read ON? 
    1. YES  : For HVAC module - EATC systems, INSTALL a new PCM. REFER to ELECTRONIC ENGINE CONTROLS article. TEST the system for normal operation.
    2. For manual climate control systems, go to  J7 .
    3. NO  : Go to  J8.
  7. J7 CHECK CIRCUIT 348 (VT) FOR A SHORT TO VOLTAGE 
    • Key in OFF position.
    • Disconnect: HVAC Module - EMTC C294a
    • Disconnect: Instrument Cluster
    • Key in ON position.
    • Measure the voltage between HVAC module - EMTC C294a-3, circuit 348 (VT), harness side and ground.
      • Fig 3: Checking Circuit 348 (VT) For Short To Voltage
      GF0004349Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. YES  : INSTALL a new PCM. REFER to ELECTRONIC ENGINE CONTROLS article. TEST the system for normal operation.
    2. NO  : REPAIR circuit 348 (VT) for a short to voltage. TEST the system for normal operation.
  8. J8 CHECK FOR VOLTAGE TO THE A/C COMPRESSOR CLUTCH FIELD COIL 
    • Key in OFF position.
    • Disconnect: A/C Compressor Clutch Field Coil C1110
    • Key in ON position.
    • Measure the voltage between A/C compressor clutch field coil C1110-1, circuit 321 (GY/WH), harness side and ground.
      • Fig 4: Checking Voltage To A/C Compressor Clutch Field Coil
      G04002936Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  J9.
    2. NO  : ADJUST the A/C compressor clutch gap. REFER to Air Conditioning (A/C) Clutch Air Gap Adjustment  in this article. TEST the system for normal operation.
  9. J9 CHECK CIRCUIT 321 (GY/WH) FOR A SHORT TO VOLTAGE 
    • Key in OFF position.
    • Disconnect: A/C Control Relay
    • Key in ON position.
    • Measure the voltage between A/C compressor clutch field coil C1110-1, circuit 321 (GY/WH), harness side and ground.
      • Fig 5: Checking Voltage To A/C Compressor Clutch Field Coil
      G04002936Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. YES  : REPAIR circuit 321 (GY/WH) for a short to voltage. TEST the system for normal operation.
    2. NO  : INSTALL a new A/C control relay. TEST the system for normal operation.
  10. J10 CHECK MODULE CONNECTION 
      NOTE: HVAC module - EATC only.
    • Clear the DTCs.
    • Carry out the HVAC Module Cold Boot Process.
      • NOTE: HVAC module - EATC only.
    • Carry out the HVAC Module - Electronic Automatic Temperature Control (EATC) On-Demand Self Test.
    • Operate the system.
    • Does the concern return? 
    1. YES  : INSTALL a new HVAC module. REFER to CLIMATE CONTROL 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.
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