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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 2009 Mercury Sable, 2009 Ford Taurus X, and 2009 Ford Taurus. 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 TABLE .

      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 C4174B.
    • Measure the voltage between LTM C4174B-9, circuit SBP14 (BN/RD), harness side and ground.
      • Fig 1: Measuring Voltage
      GF0021129Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  A4.
    2. NO  : VERIFY Smart Junction Box (SJB) fuse 14 (10A) is OK. If OK, REPAIR the circuit. CLEAR the DTCs. REPEAT the LTM self-test. If not OK, REFER to the appropriate System Wiring Diagrams article to identify the possible causes of the circuit short. CLEAR the DTCs. REPEAT the LTM self-test.
  4. A4 CHECK CIRCUIT GD147 (BK/VT) FOR AN OPEN 
    • Key in OFF position.
    • Measure the resistance between LTM C4174B-1, circuit GD147 (BK/VT), harness side and ground.
      • Fig 2: Measuring Resistance
      GF0021130Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. YES  : RECONNECT power liftgate system electrical connectors and Go to  A5 .
    2. NO  : REPAIR the circuit. CLEAR the DTCs. REPEAT the LTM self-test.
  5. A5 CHECK THE DETENT AND FORKBOLT SWITCH PID 
    • Enter the following diagnostic mode on the diagnostic tool: DataLogger - LTM
    • Operate the liftgate manually while monitoring the following LTM PIDs:
      • Detent Switch Status (DETENTSW)
      • Forkbolt Switch Status (FORKBLT_S)
      • Forkbolt Secondary Switch (FKSWSEC)
      • NOTE: The liftgate is in the primary position when the liftgate is in the full closed position. The liftgate is in the unlatch position when the liftgate is 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 FORKBLT_S FKSWSEC
      Fully Unlatched Inactivea Active Active
      Primary Active Inactive Inactive

      a If detent switch is active in the fully unlatched position, manually attempt to rotate the forkbolt 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 FORKBOLT SWITCHES 
    • Key in OFF position.
    • Disconnect: LTM C4174A
    • Measure the resistance between LTM C4174A, harness side and ground at each of the connector pins and each latch position specified by the chart below.
      Liftgate Latch Position C4174A Circuit Resistance
      Fully Unlatched Pin 3, circuit CPR66 (GY/YE) Greater than 10,000 ohmsa
      Fully Unlatched Pin 5, circuit CPR65 (BU/GN) Less than 5 ohms
      Fully Unlatched Pin 4, circuit CPR64 (VT/OG) Less than 5 ohms
      Primary Pin 3, circuit CPR66 (GY/YE) Less than 5 ohms
      Primary Pin 5, circuit CPR65 (BU/GN) Greater than 10,000 ohms
      Primary Pin 4, circuit CPR64 (VT/OG) Greater than 10,000 ohms

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

      • Fig 3: Measuring Resistance
      GF0021131Courtesy of FORD MOTOR CO.
    • Do the resistance values agree with the chart? 
    1. YES  : Go to  A31.
    2. NO  : Go to  A7.
  7. A7 CHECK THE DETENT AND FORKBOLT SWITCH GROUND CIRCUIT 
    • Disconnect: Liftgate Latch/Unlatch Assembly C4339
    • Measure the resistance between power liftgate latch/unlatch assembly C4339-8, circuit GD147 (BK/VT), harness side and ground.
      • Fig 4: Measuring Resistance
      GF0021132Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  A8.
    2. NO  : REPAIR the circuit. CLEAR the DTCs. REPEAT the LTM self-test.
  8. A8 CHECK THE DETENT AND FORKBOLT SWITCH CIRCUITS FOR AN OPEN 
    • Measure the resistance between power liftgate latch/unlatch assembly C4339, harness side and LTM C4174A, harness side using the following chart:
      Power Liftgate Latch/Unlatch Assembly Circuit LTM
      C4339-1 CPR65 (BU/GN) C4174A-5
      C4339-3 CPR64 (VT/OG) C4174A-4
      C4339-2 CPR66 (GY/YE) C4174A-3
      • Fig 5: Measuring Resistance
      GF0045331Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms on all circuits? 
    1. YES  : Go to  A9.
    2. NO  : REPAIR the circuit. CLEAR the DTCs. REPEAT the LTM self-test.
  9. A9 CHECK THE DETENT AND FORKBOLT SWITCH CIRCUITS FOR A SHORT TO GROUND 
    • Measure the resistance between LTM C4174A-5, circuit CPR65 (BU/GN), harness side and ground; between LTM C4174A-4, circuit CPR64 (VT/OG), harness side and ground; then between LTM C4174A-3, circuit CPR66 (GY/YE), harness side and ground.
      • Fig 6: Measuring Resistance
      GF0021131Courtesy of FORD MOTOR CO.
    • 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 article. CLEAR the DTCs. REPEAT the LTM self-test.

    2. NO  : REPAIR the circuit. CLEAR the DTCs. REPEAT the LTM self-test.
  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 . CLEAR the DTCs. REPEAT the LTM self-test.
  11. A11 CHECK FOR VOLTAGE AT THE POWER LIFTGATE MOTOR AND CLUTCH 
    • Key in ON position.
    • Liftgate in the fully closed position.
    • With the motor/clutch connected and while activating the power liftgate control switch, measure the voltage between power liftgate motor/clutch C4332-1, circuit CPR57 (GN/WH) backprobe and ground; then between power liftgate motor/clutch C4332-2, circuit CPR69 (BN/BU), backprobe and power liftgate motor/clutch C4332-7, circuit GD147 (BK/VT), backprobe.
      • Fig 7: Measuring Voltage
      GF0021134Courtesy of FORD MOTOR CO.
    • 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 . CLEAR the DTCs. REPEAT the LTM self-test.
    2. NO  : Go to  A12.
  12. A12 CHECK THE MOTOR AND CLUTCH VOLTAGE OUTPUTS AT THE LTM 
    • With the LTM connected, measure the voltage between LTM C4174B-6, circuit CPR58 (GN/OG), backprobe and ground; then between LTM C4174B-8, circuit CPR69 (BN/BU), backprobe and ground.
      • Fig 8: Measuring Voltage
      GF0021135Courtesy of FORD MOTOR CO.
    • 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 C4174B
    • Measure the voltage between LTM C4174B-4, circuit SBB29 (GY/RD), harness side and ground.
      • Fig 9: Measuring Voltage
      GF0021136Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. YES  : If you are here because of DTC B2552, go to  A31. Otherwise, go to  A18.
    2. NO  : VERIFY Battery Junction Box (BJB) fuse 29 (30A) is OK. If OK, REPAIR the circuit. CLEAR the DTCs. REPEAT the LTM self-test. If not OK, REFER to the appropriate System Wiring Diagrams article to identify the possible causes of the circuit short. CLEAR the DTCs. REPEAT the LTM self-test.
  14. A14 CHECK CIRCUIT CLUTCH GROUND CIRCUIT GD147 (BK/VT) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: LTM C4174A
    • Disconnect: Power Liftgate Motor C4332
    • Measure the resistance between power liftgate motor C4332-7, circuit GD147 (BK/VT), harness side and ground.
      • Fig 10: Measuring Resistance
      GF0021137Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  A15.
    2. NO  : REPAIR the circuit. CLEAR the DTCs. REPEAT the LTM self-test.
  15. A15 CHECK THE MOTOR/CLUTCH CIRCUITS FOR AN OPEN 
    • Measure the resistance between LTM C4174B, harness side and the power liftgate motor/clutch C4332, harness side, using the following chart:
      LTM Circuit Power Liftgate Motor/Clutch
      C4174B-5 CPR57 (GN/WH) C4332-1
      C4174B-6 CPR58 (GN/OG) C4332-5
      C4174B-8 CPR69 (BN/BU) C4332-2
      • Fig 11: Measuring Resistance
      GF0045332Courtesy of FORD MOTOR CO.
    • Are the resistances less than 5 ohms? 
    1. YES  : Go to  A16.
    2. NO  : REPAIR the circuit. CLEAR the DTCs. REPEAT the LTM self-test.
  16. A16 CHECK THE MOTOR/CLUTCH CIRCUITS FOR A SHORT TO GROUND 
    • Key in OFF position.
    • Disconnect: LTM C4174A
    • Disconnect: Power Liftgate Motor C4332
    • Measure the resistance between LTM C4174B-5, circuit CPR57 (GN/WH), harness side and ground; between LTM C4174B-6, circuit CPR58 (GN/OG), harness side and ground; then between LTM C4174B-8, circuit CPR69 (BN/BU), harness side and ground.
      • Fig 12: Measuring Resistance
      GF0021139Courtesy of FORD MOTOR CO.
    • Are the resistances greater than 10,000 ohms? 
    1. YES  : Go to  A17.
    2. NO  : REPAIR the circuit. If DTC B106E was present, CLEAR the DTCs. REPEAT the LTM self-test.
  17. A17 CHECK THE MOTOR/CLUTCH CIRCUITS FOR A SHORT TO VOLTAGE 
    • Key in ON position.
    • Measure the voltage between LTM C4174B-5, circuit CPR57 (GN/WH), harness side and ground; between LTM C4174B-6, circuit CPR58 (GN/OG), harness side and ground; then between LTM C4174B-8, circuit CPR69 (BN/BU), harness side and ground.
      • Fig 13: Measuring Voltage
      GF0021140Courtesy of FORD MOTOR CO.
    • Is any voltage present? 
    1. YES  : REPAIR the circuit. CLEAR the DTCs. REPEAT the LTM self-test.
    2. NO  : CHECK the power liftgate motor and clutch connectors for corrosion or pushed-out pins. REPAIR as necessary. CLEAR the DTCs. REPEAT the LTM self-test.
  18. A18 CHECK THE POSITION SENSOR PID 
    • Key in OFF position.
    • Connect: All LTM Connectors
    • Connect: Power Liftgate Motor C4332
    • Key in ON position.
    • Open the liftgate to the full open position.
    • Enter the following diagnostic mode on the diagnostic tool: DataLogger - LTM
    • 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 C4332
    • Key in ON position.
    • Measure the voltage between power liftgate motor C4332-4, circuit CPR55 (GN/BU), harness side and ground.
      • Fig 14: Measuring Voltage
      GF0021141Courtesy of FORD MOTOR CO.
    • 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 C4174A
    • Measure the resistance between LTM C4174A-6, circuit CPR55 (GN/BU), harness side and power liftgate motor C4332-4, circuit CPR55 (GN/BU), harness side; and between LTM C4174A-6, circuit CPR55 (GN/BU), harness side and ground.
      • Fig 15: Measuring Resistance
      GF0021142Courtesy of FORD MOTOR CO.
    • 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. CLEAR the DTCs. REPEAT the LTM self-test.
  21. A21 CHECK THE POSITION SENSOR RETURN CIRCUIT 
    • Key in OFF position.
    • Disconnect: Power Liftgate Motor C4332
    • Key in ON position.
    • Measure the resistance between power liftgate motor C4332-9, circuit RPR55 (WH/BU), harness side and ground.
      • Fig 16: Measuring Resistance
      GF0021143Courtesy of FORD MOTOR CO.
    • 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 C4174A
    • Measure the resistance between LTM C4174A-7, circuit RPR55 (WH/BU), harness side and power liftgate motor C4332-9, circuit RPR55 (WH/BU), harness side.
      • Fig 17: Measuring Resistance
      GF0021144Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  A31.
    2. NO  : REPAIR the circuit. CLEAR the DTCs. REPEAT the LTM self-test.
  23. A23 CHECK THE POSITION SENSOR CIRCUITS FOR AN OPEN 
    • Key in ON position.
    • Measure the voltage between power liftgate motor C4332-3, circuit VPR53 (BU/WH), harness side and ground; and between power liftgate motor C4332-8, circuit VPR54 (BU/BN), harness side and ground.
      • Fig 18: Measuring Voltage
      GF0021145Courtesy of FORD MOTOR CO.
    • Is the voltage approximately 5 volts for both measurements? 
    1. YES  : INSTALL a new power liftgate motor. REFER to Power Liftgate Motor . CLEAR the DTCs. REPEAT the LTM self-test.
    2. NO  : Go to  A24.
  24. A24 CHECK THE POSITION SENSOR CIRCUITS FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: LTM C4174A
    • Measure the resistance between power liftgate motor C4332, harness side and LTM C4174A, harness side using the following chart:
      Power Liftgate Motor Circuit LTM
      C4332-3 VPR53 (BU/WH) C4174A-20
      C4332-8 VPR54 (BU/BN) C4174A-21
      • Fig 19: Measuring Resistance
      GF0043681Courtesy of FORD MOTOR CO.
    • Are the resistances less than 5 ohms? 
    1. YES  : Go to  A25.
    2. NO  : REPAIR the circuit. CLEAR the DTCs. REPEAT the LTM self-test.
  25. A25 CHECK THE POSITION SENSOR CIRCUITS FOR A SHORT TO GROUND 
    • Measure the resistance between power liftgate motor C4332-8, circuit VPR54 (BU/BN), harness side and ground; and between power liftgate motor C4332-3, circuit VPR53 (BU/WH), harness side and ground.
      • Fig 20: Measuring Resistance
      GF0021147Courtesy of FORD MOTOR CO.
    • Are the resistances greater than 10,000 ohms? 
    1. YES  : Go to  A26.
    2. NO  : REPAIR the circuit. CLEAR the DTCs. REPEAT the LTM self-test.
  26. A26 CHECK THE POSITION SENSOR CIRCUITS FOR A SHORT TO VOLTAGE 
    • Key in ON position.
    • Measure the voltage between power liftgate motor C4332-8, circuit VPR54 (BU/BN), harness side and ground; and between power liftgate motor C4332-3, circuit VPR53 (BU/WH), harness side and ground.
      • Fig 21: Measuring Voltage
      GF0021145Courtesy of FORD MOTOR CO.
    • Is any voltage present? 
    1. YES  : REPAIR the circuit. CLEAR the DTCs. REPEAT the LTM self-test.
    2. NO  : Go to  A31.
  27. A27 CHECK THE UNLATCH/CINCHING MOTOR CIRCUITS 
    • Key in OFF position.
    • Disconnect: LTM C4174B
    • Close the power liftgate.
      NOTE: 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 jumper wire between LTM C4174B-3, circuit CPR62 (WH/BU), harness side and the positive side of the battery; and connect a jumper between LTM C4174B-2, circuit CPR61 (BN), harness side and ground.
      • Fig 22: Connecting Fused Jumper Wire
      GF0021148Courtesy of FORD MOTOR CO.
    • 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 C4339
    • Measure the resistance between power liftgate latch C4339, harness side and LTM C4174B, harness side, using the following chart:
      Liftgate Latch/Unlatch Assembly Circuit LTM
      C4339-5 CPR61 (BN) C4174B-2
      C4339-7 CPR62 (WH/BU) C4174B-3
      • Fig 23: Measuring Resistance
      GF0045333Courtesy of FORD MOTOR CO.
    • Are the resistances less than 5 ohms? 
    1. YES  : Go to  A29.
    2. NO  : REPAIR the circuit. CLEAR the DTCs. REPEAT the LTM self-test.
  29. A29 CHECK THE UNLATCH/CINCHING MOTOR CIRCUITS FOR A SHORT TO GROUND 
    • Measure the resistance between power liftgate latch C4339-5, circuit CPR61 (BN), harness side and ground; then between power liftgate latch C4339-7, circuit CPR62 (WH/BU), harness side and ground.
      • Fig 24: Measuring Resistance
      GF0021150Courtesy of FORD MOTOR CO.
    • Are the resistances greater than 10,000 ohms? 
    1. YES  : Go to  A30.
    2. NO  : REPAIR the circuit. CLEAR the DTCs. REPEAT the LTM self-test.
  30. A30 CHECK THE UNLATCH ACTUATOR CIRCUITS FOR A SHORT TO VOLTAGE 
    • Key in ON position.
    • Measure the voltage between power liftgate latch C4339-5, circuit CPR61 (BN), harness side and ground; then between power liftgate latch C4339-7, circuit CPR62 (WH/BU), harness side and ground.
      • Fig 25: Measuring Voltage
      GF0021151Courtesy of FORD MOTOR CO.
    • Is voltage present on either circuit? 
    1. YES  : REPAIR the circuit. CLEAR the DTCs. REPEAT the LTM self-test.
    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 article. CLEAR the DTCs. REPEAT the LTM self-test.

  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 LTM self-test.
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