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Pinpoint Test L : B2908

  1. L1 CHECK THE OPERATION OF THE DETENT AND FORKBOLT SWITCHES

    • Ignition OFF.
    • Disconnect: LTM C4174B.
    • Place the liftgate in the fully unlatched position.
    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C4174B-16
      GFD33596Courtesy of FORD MOTOR COMPANY
      		 Ground
      C4174B-18
      GFD33596Courtesy of FORD MOTOR COMPANY
      		 Ground
      C4174B-17
      GFD33596Courtesy of FORD MOTOR COMPANY
      		 Ground
    • Record the test results.
    • Place the liftgate in the primary latch position.
    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C4174B-16
      GFD33596Courtesy of FORD MOTOR COMPANY
      		 Ground
      C4174B-18
      GFD33596Courtesy of FORD MOTOR COMPANY
      		 Ground
      C4174B-17
      GFD33596Courtesy of FORD MOTOR COMPANY
      		 Ground
    • Record the test results.
    • Compare the results with the table below.
      Liftgate Latch Position Measurement at C4174B-Pin Resistance
      Fully Unlatched 16 Less than 5 ohms
      Fully Unlatched 18 Less than 5 ohms
      Fully Unlatched 17 Less than 5 ohms
      Primary 16 Less than 5 ohms
      Primary 18 Greater than 10, 000 ohms
      Primary 17 Greater than 10, 000 ohms

    Do the resistance values agree with the table? 

    Yes  GO to  L5.
    No  GO to  L2.

  2. L2 CHECK THE DETENT AND FORKBOLT SWITCH GROUND CIRCUIT

    • Disconnect: Power Liftgate Latch.
    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C4819-8
      GFD33596Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance less than 3 ohms? 

    Yes  GO to  L3.
    No  REPAIR the circuit for an open.

  3. L3 CHECK THE DETENT AND FORKBOLT SWITCH CIRCUITS FOR A SHORT TO GROUND

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C4174B-18
      GFD33596Courtesy of FORD MOTOR COMPANY
      		 Ground
      C4174B-17
      GFD33596Courtesy of FORD MOTOR COMPANY
      		 Ground
      C4174B-16
      GFD33596Courtesy of FORD MOTOR COMPANY
      		 Ground

    Are the resistances greater than 10, 000 ohms? 

    Yes  GO to  L4.
    No  REPAIR the circuit in question.

  4. L4 CHECK THE DETENT AND FORKBOLT SWITCH CIRCUITS FOR AN OPEN

    Are the resistances less than 3 ohms? 

    Yes  INSTALL a new power liftgate latch. REFER to Handles, Locks, Latches and Entry Systems - With Intelligent Access (IA) .
    No  REPAIR the circuit in question.

  5. L5 CHECK FOR CORRECT LTM OPERATION

    • Ignition OFF.
    • Disconnect and inspect all LTM 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
    • Reconnect all the LTM connectors. Make sure they seat and latch correctly.
    • Operate the system and determine if 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 TSBs address this concern, INSTALL a new LTM. Refer to Liftgate/Trunk Module (LTM) .
    No  The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.
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