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Pinpoint Test A: The Power Liftgate Is Inoperative - Does Not Open Or Close

WARNING: This page is about a different car, the 2007 Lincoln MKX and 2007 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.
  1. A1 RETRIEVE THE DTCs FROM THE LTM 
    • Use the recorded LTM DTCs from the continuous and LTM self-tests.
    • Are any LTM DTCs recorded? 
    1. YES  : For DTC B106F, REFER to the Liftgate/Trunk Module (LTM) DTC Chart.

      For DTC B2908, go to  A5 .

      For DTC B2418, go to  A19.

      For DTC B2419 or B2420, go to  A18 .

      For DTC B2935, go to  A10 .

      For DTC B2552, go to  A13 .

      For DTC B2936, B2819, B2937 or B2939, go to  A14 .

      For DTC B106E, go to  A16 .

      For DTC B1179, B117A, or B117B, go to  A27 .

    2. NO  : Go to  A2.
  2. A2 CHECK THE OPERATION OF THE POWER LIFTGATE SWITCHES 
    • Vehicle in PARK.
      • NOTE: Make sure the power liftgate is enabled (ON) in the vehicle message center.
    • Close the liftgate to the full closed position (manually if necessary).
    • Activate the power liftgate from the power liftgate control switch (instrument panel).
    • Activate the power liftgate from the remote transmitter.
    • Activate the power liftgate from the liftgate exterior handle.
    • Does the power liftgate power open from any switch? 
    1. YES  : Go to Pinpoint Test B .
    2. NO  : Go to  A3.
  3. A3 CHECK CIRCUIT SBP14 (BN/RD) FOR AN OPEN 
    • Disconnect LTM C4174A.
      • Fig 1: Measuring Voltage Between LTM C4174A-9, Circuit SBP14 (BN/RD), Harness Side & Ground
      GF0021129Courtesy of FORD MOTOR CO.
    • Measure the voltage between LTM C4174A-9, circuit SBP14 (BN/RD), harness side and ground.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  A4.
    2. NO  : VERIFY the smart junction box (SJB) fuse 14 (10A) is OK. If OK, REPAIR the circuit. TEST the system for normal operation.
  4. A4 CHECK CIRCUIT GD149 (BK/GY) FOR AN OPEN 
    • Key in OFF position.
      • Fig 2: Measuring Resistance Between LTM C4174A-1, Circuit GD149 (BK/GY), Harness Side & Ground
      GF0021130Courtesy of FORD MOTOR CO.
    • Measure the resistance between LTM C4174A-1, circuit GD149 (BK/GY), harness side and ground.
    • Is the resistance less than 5 ohms? 
    1. YES  : RECONNECT power liftgate system electrical connectors and Go to  A5 .
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  5. A5 CHECK THE DETENT AND FORK BOLT SWITCH PID 
    • Enter the following diagnostic mode on the diagnostic tool: LTM DataLogger
    • Operate the liftgate manually while monitoring the following LTM PIDs:
      • Detent Switch Status (DETENTSW)
      • Fork bolt Switch Status (FORKBLT_S)
      • Fork bolt Secondary Switch (FKSWSEC)
      • NOTE: The liftgate is in the primary position when in the full closed position. The liftgate is in the unlatch position when open and completely out of the striker. The liftgate can be placed in the unlatched position by lifting up on the liftgate handle.
    • Begin with the liftgate in the open position, then slowly close the liftgate into each of the latch positions specified by the table below.
      Liftgate Latch Position DETENTSW FKSWSEC FORKBLT_S
      Fully Unlatched Not activea Active Active
      In primary Active Not active Not active

      a If detent switch is active in the fully unlatched position, manually attempt to rotate the fork bolt towards the latched position.

    • Do the switch states agree with the table? 
    1. YES  : Go to  A10.
    2. NO  : Go to  A6.
  6. A6 CHECK THE OPERATION OF THE DETENT AND FORK BOLT SWITCHES 
    • Key in OFF position.
    • Disconnect: LTM C4174B
      • Fig 3: Measuring Resistance Between LTM C4174B, Harness Side & Ground
      GF0021131Courtesy of FORD MOTOR CO.
    • Measure the resistance between LTM C4174B, harness side and ground at each of the connector pins and each latch position specified by the table below.
      Liftgate Latch Position C4174B Circuit Resistance
      Fully Unlatched Pin 3, circuit CPR66 (GY/YE) Greater than 10,000 ohmsa
      Fully Unlatched Pin 5, circuit CPR64 (VT/OG) Less than 5 ohms
      Fully Unlatched Pin 4, circuit CPR65 (BU/GN) Less than 5 ohms
      Primary Pin 3, circuit CPR66 (GY/YE) Less than 5 ohms
      Primary Pin 5, circuit CPR64 (VT/OG) Greater than 10,000 ohms
      Primary Pin 4, circuit CPR65 (BU/GN) Greater than 10,000 ohms

      a If resistance measured is less than 5 ohms, manually rotate the fork bolt to the latched position and retest.

    • Do the resistance values agree with the table? 
    1. YES  : Go to  A31.
    2. NO  : Go to  A7.
  7. A7 CHECK THE DETENT AND FORK BOLT SWITCH GROUND CIRCUIT 
    • Disconnect: Liftgate Latch/Unlatch Assembly C4188
      • Fig 4: Measuring Resistance Between Power Liftgate Latch/Unlatch Assembly C4188-8, Circuit GD149 (BK/GY)
      GF0030616Courtesy of FORD MOTOR CO.
    • Measure the resistance between power liftgate latch/unlatch assembly C4188-8, circuit GD149 (BK/GY), harness side and ground.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  A8.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  8. A8 CHECK THE DETENT AND FORK BOLT SWITCH CIRCUITS FOR AN OPEN 
      Fig 5: Measuring Resistance Between Power Liftgate Latch/Unlatch Assembly C4188 & LTM C4174B
      GF0030617Courtesy of FORD MOTOR CO.
    • Measure the resistance between power liftgate latch/unlatch assembly C4188, harness side and LTM C4174B, harness side using the following table:
      C4188 Pin Circuit C4174B Pin
      2 CPR64 (VT/OG) 5
      3 CPR65 (BU/GN) 4
      5 CPR66 (GY/YE) 3
    • Is the resistance less than 5 ohms on all circuits? 
    1. YES  : Go to  A9.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  9. A9 CHECK THE DETENT AND FORK BOLT SWITCH CIRCUITS FOR A SHORT TO GROUND 
      Fig 6: Measuring Resistance Between LTM C4174B-5, Circuit CPR64 (VT/OG)
      GF0021131Courtesy of FORD MOTOR CO.
    • Measure the resistance between LTM C4174B-5, circuit CPR64 (VT/OG), harness side and ground; between LTM C4174B-4, circuit CPR65 (BU/GN), harness side and ground; then between LTM C4174B-3, circuit CPR66 (GY/YE), harness side and ground.
    • Are the resistances greater than 10,000 ohms on all circuits? 
    1. YES  : CHECK the power liftgate latch connector for bent or corroded connections on the component side and harness side. REPAIR as necessary.

      INSTALL a new power liftgate latch. REFER to HANDLES, LOCKS, LATCHES AND ENTRY SYSTEMS . TEST the system for normal operation.

    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  10. A10 CHECK POWER LIFTGATE ROD OPERATION 
    • Check for correct function of power liftgate rod and cable.
      • Correctly attached to motor and liftgate.
      • Cable turns with actuator.
    • Is the power liftgate rod operating correctly? 
    1. YES  : Go to  A11.
    2. NO  : REPAIR as necessary. If installing a new power liftgate rod, REFER to Power Liftgate Rod . TEST the system for normal operation.
  11. A11 CHECK FOR VOLTAGE AT THE POWER LIFTGATE MOTOR AND CLUTCH 
    • Key in ON position.
    • Liftgate in the fully closed position.
      • Fig 7: Measuring Voltage Between Power Liftgate Motor/Clutch C4223-1, Circuit CPR57 (GN/WH)
      GF0021134Courtesy of FORD MOTOR CO.
    • With the motor/clutch connected and while activating the power liftgate control switch, measure the voltage between power liftgate motor/clutch C4223-1, circuit CPR57 (GN/WH) backprobe and ground; then between power liftgate motor/clutch C4223-2, circuit CPR69 (BN/BU), backprobe and power liftgate motor/clutch C4223-7, circuit GD149 (BK/GY), backprobe.
    • Are both of the voltages greater than 10 volts while activating the power liftgate switch? 
    1. YES  : If no DTCs were present, go to  A18 . If DTCs were present, INSTALL a new power liftgate motor. REFER to Power Liftgate Motor . TEST the system for normal operation.
    2. NO  : Go to  A12.
  12. A12 CHECK THE MOTOR AND CLUTCH VOLTAGE OUTPUTS AT THE LTM 
      Fig 8: Measuring Voltage Between LTM C4174A-6, Circuit CPR58 (GN/OG), Backprobe & Ground
      GF0021135Courtesy of FORD MOTOR CO.
    • With the LTM connected, measure the voltage between LTM C4174A-6, circuit CPR58 (GN/OG), backprobe and ground; then between LTM C4174A-8, circuit CPR69 (BN/BU), backprobe and ground.
    • Are the voltages greater than 10 volts while activating the power liftgate switch? 
    1. YES  : Go to  A14.
    2. NO  : Go to  A13.
  13. A13 CHECK FOR VOLTAGE AT THE LTM 
    • Key in OFF position.
    • Disconnect: LTM C4174A
      • Fig 9: Measuring Voltage Between LTM C4174A-4 Circuit SBB59 (BU/RD), Harness Side & Ground
      GF0021136Courtesy of FORD MOTOR CO.
    • Measure the voltage between LTM C4174A-4 circuit SBB59 (BU/RD), harness side and ground.
    • Is the voltage greater than 10 volts? 
    1. YES  : If sent here because of DTC B2552, go to  A31 . Otherwise, go to  A18 .
    2. NO  : VERIFY BEC fuse 27 (30A) is OK. If OK, REPAIR the circuit. TEST the system for normal operation.
  14. A14 CHECK CIRCUIT CLUTCH GROUND CIRCUIT GD149 (BK/GY) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: LTM Module C4174A
    • Disconnect: Power Liftgate Motor C4223
      • Fig 10: Measuring Resistance Between Power Liftgate Motor C4223-7, Circuit GD149 (BK/GY)
      GF0021137Courtesy of FORD MOTOR CO.
    • Measure the resistance between power liftgate motor C4223-7, circuit GD149 (BK/GY), harness side and ground.
    • Is the resistances less than 5 ohms? 
    1. YES  : Go to  A15.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  15. A15 CHECK THE MOTOR/CLUTCH CIRCUITS FOR AN OPEN 
      Fig 11: Measuring Resistance Between LTM C4174A, Harness Side & Power Liftgate Motor/Clutch C4223
      GF0021138Courtesy of FORD MOTOR CO.
    • Measure the resistance between LTM C4174A, harness side and the power liftgate motor/clutch C4223, harness side, using the following chart:
      C4174A Pin Circuit C4223 Pin
      5 CPR57 (GN/WH) 1
      6 CPR58 (GN/OG) 5
      8 CPR69 (BN/BU) 2
    • Are the resistances less than 5 ohms? 
    1. YES  : Go to  A16.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  16. A16 CHECK THE MOTOR/CLUTCH CIRCUITS FOR A SHORT TO GROUND 
    • Key in OFF position.
    • Disconnect: LTM C4174A
    • Disconnect: LTM C4223
      • Fig 12: Measuring Resistance Between LTM C4174A-5, Circuit CPR57 (GN/WH)
      GF0021139Courtesy of FORD MOTOR CO.
    • Measure the resistance between LTM C4174A-5, circuit CPR57 (GN/WH), harness side and ground; between LTM C4174A-6, circuit CPR58 (GN/OG), harness side and ground; then between LTM C4174A-8, circuit CPR69 (BN/BU), harness side and ground.
    • Are the resistances greater than 10,000 ohms? 
    1. YES  : Go to  A17.
    2. NO  : REPAIR the circuit. If DTC B106E was present, CLEAR DTCs. TEST the system for normal operation.
  17. A17 CHECK THE MOTOR/CLUTCH CIRCUITS FOR A SHORT TO VOLTAGE 
    • Key in ON position.
      • Fig 13: Measuring Voltage Between LTM C4174A-5, Circuit CPR57 (GN/WH)
      GF0021140Courtesy of FORD MOTOR CO.
    • Measure the voltage between LTM C4174A-5, circuit CPR57 (GN/WH), harness side and ground; between LTM C4174A-6, circuit CPR58 (GN/OG), harness side and ground; then between LTM C4174A-8, circuit CPR69 (BN/BU), harness side and ground.
    • Is any voltage present? 
    1. YES  : REPAIR the circuit. TEST the system for normal operation.
    2. NO  : CHECK the LTM and clutch connectors for corrosion or pushed-out pins. REPAIR as necessary. TEST the system for normal operation.
  18. A18 CHECK THE POSITION SENSOR PID 
    • Key in OFF position.
    • Connect: All LTM Connectors
    • Connect: Power Liftgate Motor C4223
    • Key in ON position.
    • Open the liftgate to the full open position.
    • Enter the following diagnostic mode on the diagnostic tool: LTM DataLogger
    • Monitor the LTM PIDs OPT_SEN_1 and OPT_SEN_2 while slowly closing the liftgate.
    • Do both of the PID values alternate from ACTIVE to INACTIVE while the liftgate is moving? 
    1. YES  : Go to  A27.
    2. NO  : Go to  A19.
  19. A19 CHECK THE POSITION SENSOR POWER CIRCUIT 
    • Disconnect: Power Liftgate Motor C4223
    • Key in ON position.
      • Fig 14: Measuring Voltage Between Power Liftgate Motor C4223-4, Circuit CPR55 (GN/BU)
      GF0021141Courtesy of FORD MOTOR CO.
    • Measure the voltage between power liftgate motor C4223-4, circuit CPR55 (GN/BU), harness side and ground.
    • Is the voltage approximately 4 to 5 volts? 
    1. YES  : Go to  A21.
    2. NO  : Go to  A20.
  20. A20 CHECK THE POSITION SENSOR POWER CIRCUIT FOR AN OPEN OR SHORT TO GROUND 
    • Key in OFF position.
    • Disconnect: LTM C4174B
      • Fig 15: Measuring Resistance Between LTM C4174B-6, Circuit CPR55 (GN/BU) & Power Liftgate Motor C4223-4
      GF0021142Courtesy of FORD MOTOR CO.
    • Measure the resistance between LTM C4174B-6, circuit CPR55 (GN/BU), harness side and power liftgate motor C4223-4, circuit CPR55 (GN/BU), harness side; and between LTM C4174B-6, circuit CPR55 (GN/BU), harness side and ground.
    • Is the resistance less than 5 ohms between LTM and power liftgate motor; and greater than 10,000 ohms between LTM and ground? 
    1. YES  : Go to  A31.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  21. A21 CHECK THE POSITION SENSOR RETURN CIRCUIT 
    • Key in OFF position.
    • Disconnect: Power Liftgate Motor C4223
    • Key in ON position.
      • Fig 16: Measuring Resistance Between Power Liftgate Motor C4223-9, Circuit RPR55 (WH/BU)
      GF0021143Courtesy of FORD MOTOR CO.
    • Measure the resistance between power liftgate motor C4223-9, circuit RPR55 (WH/BU), harness side and ground.
    • Is the resistance less than 50 ohms? 
    1. YES  : Go to  A23.
    2. NO  : Go to  A22.
  22. A22 CHECK THE POSITION SENSOR RETURN CIRCUIT FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: LTM C4174B
      • Fig 17: Measuring Resistance Between LTM C4174B-7, Circuit RPR55 (WH/BU)
      GF0021144Courtesy of FORD MOTOR CO.
    • Measure the resistance between LTM C4174B-7, circuit RPR55 (WH/BU), harness side and power liftgate motor C4223-9, circuit RPR55 (WH/BU), harness side.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  A31.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  23. A23 CHECK THE POSITION SENSOR CIRCUITS FOR AN OPEN 
    • Key in ON position.
      • Fig 18: Measuring Voltage Between Power Liftgate Motor C4223-3, Circuit VPR53 (BU/WH)
      GF0021145Courtesy of FORD MOTOR CO.
    • Measure the voltage between power liftgate motor C4223-3, circuit VPR53 (BU/WH), harness side and ground; and between power liftgate motor C4223-8, circuit VPR54 (BU/BN), harness side and ground.
    • Is the voltage approximately 5 volts for both measurements? 
    1. YES  : INSTALL a new power liftgate motor. REFER to Power Liftgate Motor . TEST the system for normal operation.
    2. NO  : Go to  A24.
  24. A24 CHECK THE POSITION SENSOR CIRCUITS FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: LTM C4174B
      • Fig 19: Measuring Resistance Between Power Liftgate Motor C4223, Harness Side & LTM C4174B
      GF0021146Courtesy of FORD MOTOR CO.
    • Measure the resistance between power liftgate motor C4223, harness side and LTM C4174B, harness side using the following chart:
      C4223 Pin Circuit C4174B Pin
      3 VPR53 (BU/WH) 20
      8 VPR54 (BU/BN) 21
    • Are the resistances less than 5 ohms? 
    1. YES  : Go to  A25.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  25. A25 CHECK THE POSITION SENSOR CIRCUITS FOR A SHORT TO GROUND 
      Fig 20: Measuring Resistance Between Power Liftgate Motor C4223-8, Circuit VPR54 (BU/BN)
      GF0021147Courtesy of FORD MOTOR CO.
    • Measure the resistance between power liftgate motor C4223-8, circuit VPR54 (BU/BN), harness side and ground; and between power liftgate motor C4223-3, circuit VPR53 (BU/WH), harness side and ground.
    • Are the resistances greater than 10,000 ohms? 
    1. YES  : Go to  A26.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  26. A26 CHECK THE POSITION SENSOR CIRCUITS FOR A SHORT TO VOLTAGE 
    • Key in ON position.
      • Fig 21: Measuring Voltage Between Power Liftgate Motor C4223-8, Circuit VPR54 (BU/BN)
      GF0021145Courtesy of FORD MOTOR CO.
    • Measure the voltage between power liftgate motor C4223-8, circuit VPR54 (BU/BN), harness side and ground; and between power liftgate motor C4223-3, circuit VPR53 (BU/WH), harness side and ground.
    • Is any voltage present? 
    1. YES  : REPAIR the circuit. TEST the system for normal operation.
    2. NO  : Go to  A31.
  27. A27 CHECK THE UNLATCH/CINCHING MOTOR CIRCUITS 
    • Key in OFF position.
    • Disconnect: LTM C4174A
    • Close the power liftgate.
      • Fig 22: Connecting Fused (10A) Jumper Wire Between LTM C4174A-3, Circuit CPR62 (WH/BU)
      GF0021148Courtesy of FORD MOTOR CO.
      CAUTION: Do not apply power and ground to the unlatch actuator circuits for more than a few seconds or damage to the motor may occur.
    • Connect a fused (10A) jumper wire between LTM C4174A-3, circuit CPR62 (WH/BU), harness side and the positive side of the battery; and connect a jumper between LTM C4174A-2, circuit CPR61 (BN), harness side and ground.
    • Does the unlatch/cinching motor activate when power and ground are applied? 
    1. YES  : Go to  A31.
    2. NO  : Go to  A28.
  28. A28 CHECK THE UNLATCH/CINCHING MOTOR CIRCUITS FOR AN OPEN 
    • Disconnect: Liftgate Latch/Unlatch Assembly C4188
      • Fig 23: Measuring Resistance Between Power Liftgate Latch C4188-1, Circuit CPR61 (BN)
      GF0030618Courtesy of FORD MOTOR CO.
    • Measure the resistance between power liftgate latch C4188-1, circuit CPR61 (BN), harness side and LTM C4174A-2, circuit CPR61 (BN), harness side; then between power liftgate latch C4188-4, circuit CPR62 (WH/BU), harness side and LTM C4174A-3, circuit CPR62 (WH/BU), harness side.
    • Are the resistances less than 5 ohms? 
    1. YES  : Go to  A29.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  29. A29 CHECK THE UNLATCH/CINCHING MOTOR CIRCUITS FOR A SHORT TO GROUND 
      Fig 24: Measuring Resistance Between Power Liftgate Latch C4188-1, Circuit CPR61 (BN)
      GF0030619Courtesy of FORD MOTOR CO.
    • Measure the resistance between power liftgate latch C4188-1, circuit CPR61 (BN), harness side and ground; then between power liftgate latch C4188-4, circuit CPR62 (WH/BU), harness side and ground.
    • Are the resistances greater than 10,000 ohms? 
    1. YES  : Go to  A30.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  30. A30 CHECK THE UNLATCH ACTUATOR CIRCUITS FOR A SHORT TO VOLTAGE 
    • Key in ON position.
      • Fig 25: Measuring Voltage Between Power Liftgate Latch C4188-1, Circuit CPR61 (BN)
      GF0030620Courtesy of FORD MOTOR CO.
    • Measure the voltage between power liftgate latch C4188-1, circuit CPR61 (BN), harness side and ground; then between power liftgate latch C4188-4, circuit CPR62 (WH/BU), harness side and ground.
    • Is voltage present on either circuit? 
    1. YES  : REPAIR the circuit. TEST the system for normal operation.
    2. NO  : CHECK the power liftgate latch connectors for bent or corroded connections on the component side and harness side. REPAIR as necessary.

      INSTALL a new power liftgate latch. REFER to HANDLES, LOCKS, LATCHES AND ENTRY SYSTEMS . TEST the system for normal operation.

  31. A31 CHECK FOR CORRECT LTM OPERATION 
    • Disconnect all the LTM connectors.
    • Check for:
      • corrosion.
      • pushed-out pins.
    • Connect all the LTM connectors and make sure they are seated correctly.
    • Make sure the liftgate is fully closed.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
    1. YES  : INSTALL a new LTM. REFER to Liftgate/Trunk Module (LTM) . REPEAT the LTM self-test.
    2. NO  : The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the PLG module self-test.
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