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Pinpoint Test C: DTC B1242 Air Inlet Door Failure

WARNING: This page is about a different car, the 2004 Mercury Monterey and 2004 Ford Freestar. However, it is still accessible from the selected car via links, so may be relevant.
  1. C1 CHECK THE AIR INLET DOOR ACTUATOR CLOCKWISE OPERATION 
    • Disconnect: EMTC Module C294a or EATC C228a.
    • Remove the door actuator and disengage the actuator driveshaft from the actuator door.
    • Mark the door actuator driveshaft position.
    • Connect a fused jumper wire between EMTC module C294a-8 or EATC module C228a-8, circuit 1991 (LB/WH) and EMTC module C294a-26 or EATC module C228a-26, circuit 1001 (WH/YE). Connect a second fused jumper wire between EMTC module C294a-9 or EATC module C228a-9, circuit 1990 (WH/LB) and EMTC module C294a-1 or EATC module C228a-1, circuit 1203 (BK/LB).
      Fig 1: Checking Air Inlet Door Actuator Clockwise Operation
      G03245357Courtesy of FORD MOTOR CO.
    • Does the actuator motor move in the clockwise direction? 

    Yes 

    GO to C2.

    No 

    GO to  C3.

  2. C2 CHECK THE AIR INLET DOOR ACTUATOR COUNTERCLOCKWISE OPERATION 
    • Connect a fused jumper wire between EMTC module C294a-8 or EATC module C228a-8, circuit 1991 (LB/WH) and EMTC module C294a-1 or EATC module C228a-1, circuit 1203 (BK/LB). Connect a second fused jumper wire between EMTC module C294a-9 or EATC module C228a-9, circuit 1990 (WH/LB) and EMTC module C294a-26 or EATC module C228a-26, circuit 1001 (WH/YE).
      Fig 2: Checking Air Inlet Door Actuator Counterclockwise Operation
      G03245358Courtesy of FORD MOTOR CO.
    • Does the actuator motor move in the counterclockwise direction? 

    Yes 

    INSPECT for binding or broken door and linkage. If no condition is found, INSTALL a new EMTC module or EATC module. TEST the system for normal operation.

    No 

    GO to C3.

  3. C3 CHECK CIRCUIT 1991 (LB/WH) FOR A SHORT TO GROUND 
    • Disconnect: Recirc Door Actuator C289.
    • Measure the resistance between ground and EMTC module C294a-8 or EATC module C228a-8, circuit 1991 (LB/WH).
      Fig 3: Checking Circuit 1991 (LB/WH) For A Short To Ground
      G03245359Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 

    Yes 

    GO to C4.

    No 

    REPAIR circuit 1991 (LB/WH) for a short to ground. TEST the system for normal operation.

  4. C4 CHECK CIRCUIT 1990 (WH/LB) FOR A SHORT TO GROUND 
    • Measure the resistance between ground and EMTC module C228a-9 or EATC module C228a-9, circuit 1990 (WH/LB).
      Fig 4: Checking Circuit 1990 (WH/LB) For A Short To Ground
      G03245360Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 

    Yes 

    GO to C5.

    No 

    REPAIR circuit 1990 (WH/LB) for a short to ground. TEST the system for normal operation.

  5. C5 CHECK CIRCUIT 1991 (LB/WH) FOR A SHORT TO POWER 
    • Key in ON position.
    • Measure the voltage between ground and EMTC module C228a-8 or EATC module C228a-8, circuit 1991 (LB/WH).
      Fig 5: Checking Circuit 1991 (LB/WH) For A Short To Power
      G03245361Courtesy of FORD MOTOR CO.
    • Is voltage present? 

    Yes 

    REPAIR circuit 1991 (LB/WH) for a short to power. TEST the system for normal operation.

    No 

    GO to C6.

  6. C6 CHECK CIRCUIT 1990 (WH/LB) FOR A SHORT TO POWER 
    • Measure the voltage between ground and EMTC module C294a-9 or EATC module C228a-9, circuit 1990 (WH/LB).
      Fig 6: Checking Circuit 1990 (WH/LB) For A Short To Power
      G03245362Courtesy of FORD MOTOR CO.
    • Is voltage present? 

    Yes 

    REPAIR circuit 1990 (WH/LB) for a short to power. TEST the system for normal operation.

    No 

    GO to C7.

  7. C7 CHECK CIRCUIT 1991 (LB/WH) FOR AN OPEN 
    • Key in OFF position.
    • Measure the resistance between EMTC module C294a-8 or EATC module C228a-8, circuit 1991 (LB/WH) and the recirc door actuator C289-1, circuit 1991 (LB/WH).
      Fig 7: Checking Circuit 1991 (LB/WH) For An Open
      G03245363Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 

    Yes 

    GO to C8.

    No 

    REPAIR circuit 1991 (LB/WH) for an open. TEST the system for normal operation.

  8. C8 CHECK CIRCUIT 1990 (WH/LB) FOR AN OPEN 
    • Measure the resistance between EMTC module C294a-9 or EATC module C228a-9, circuit 1990 (WH/LB) and the recirc door actuator C289-6, circuit 1990 (WH/LB).
      Fig 8: Checking Circuit 1990 (WH/LB) For An Open
      G03245364Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 

    Yes 

    INSPECT for binding or broken linkage. If no condition is found, INSTALL a new door actuator. TEST the system for normal operation.

    No 

    REPAIR circuit 1990 (WH/LB) for an open. TEST the system for normal operation.

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