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Pinpoint Test G: The Power Liftgate Does Not Power Close (Power Open OK)

WARNING: This page is about a different car, the 2010 Lincoln MKX and 2010 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Use the correct probe adapter(s) from the Flex Probe Kit when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
  1. G1 RETRIEVE THE DTCs FROM THE LTM 
    • Use the recorded LTM  DTCs from the continuous and LTM  self-tests.
    • Is DTC B2699, B2700, B2701 or B2702 present? 
    • Yes:  GO to G2  .
    • No:  GO to  G9.
  2. G2 CHECK THE LIFTGATE LEFT/RIGHT PINCH STRIP STATUS (LFT_PINCH/RT_PINCH) OPERATION 
    • Enter the following diagnostic mode on the scan tool: DataLogger - LTM  .
    • Monitor the LTM  PIDs LFT_PINCH and RT_PINCH while activating the left and right pinch strips.
    • Does the PID state change/agree with the pinch strip status? 
    • Yes:  GO to  G14.
    • No:  GO to G3  .
  3. G3 CHECK THE PINCH STRIP SIGNAL CIRCUIT 
    • Ignition OFF.
    • Disconnect: Pinch Strip (Left C4172, Right C4173).
    • Ignition ON.
    • Measure the voltage between left pinch strip C4172-1, circuit CPR52 (YE/VT), harness side and ground; and between right pinch strip C4173-1, circuit CPR51 (YE/OG), harness side and ground.
      Fig 1: Checking Pinch Strip Signal Circuit
      G06070751Courtesy of FORD MOTOR CO.
    • Are the voltages approximately 5 volts? 
    • Yes:  GO to  G7.
    • No:  If the voltage measured was greater than 5 volts, GO to G4  . If the voltage measured was less than 5 volts, GO to  G5.
  4. G4 CHECK THE PINCH STRIP SIGNAL CIRCUIT FOR SHORT TO VOLTAGE 
    • Ignition OFF.
    • Disconnect: LTM  C4174B.
    • Ignition ON.
    • Measure the voltage between left pinch strip C4172-1, circuit CPR52 (YE/VT), harness side and ground; and between right pinch strip C4173-1, circuit CPR51 (YE/OG), harness side and ground.
      Fig 2: Checking Pinch Strip Signal Circuit
      G06070751Courtesy of FORD MOTOR CO.
    • Is any voltage present? 
    • Yes:  REPAIR the circuit(s). CLEAR the DTCs. REPEAT the LTM  self-test.
    • No:  GO to  G14.
  5. G5 CHECK THE PINCH STRIP SIGNAL CIRCUIT FOR A SHORT TO GROUND 
    • Ignition OFF.
    • Disconnect: LTM  C4174B.
    • Measure the resistance between left pinch strip C4172-1, circuit CPR52 (YE/VT), harness side and ground; or between right pinch strip C4173-1, circuit CPR51 (YE/OG), harness side and ground.
      Fig 3: Checking Pinch Strip Signal Circuit For Short To Ground
      G06070753Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    • Yes:  GO to G6  .
    • No:  REPAIR the circuit. CLEAR the DTCs. REPEAT the LTM  self-test.
  6. G6 CHECK THE PINCH STRIP SIGNAL CIRCUITS FOR AN OPEN 
    • Ignition OFF.
    • Disconnect: LTM  C4174B.
    • Measure the resistance between left pinch strip C4172-1, circuit CPR52 (YE/VT), harness side and LTM  C4174B-25, circuit CPR52 (YE/VT), harness side.
      Fig 4: Measuring Resistance Between Left Pinch Strip C4172-1, Circuit CPR52 (YE/VT) And LTM C4174B-25, Circuit CPR52 (YE/VT)
      G06505783Courtesy of FORD MOTOR CO.
    • Then measure the resistance between right pinch strip C4173-1, circuit CPR51 (YE/OG), harness side and LTM  C4174B-1, circuit CPR51 (YE/OG), harness side.
      Fig 5: Measuring Resistance Between Right Pinch Strip C4173-1, Circuit CPR51 (YE/OG) And LTM C4174B-1, Circuit CPR51 (YE/OG)
      G06070755Courtesy of FORD MOTOR CO.
    • Are the resistances less than 5 ohms? 
    • Yes:  GO to  G14.
    • No:  REPAIR the circuit. CLEAR the DTCs. REPEAT the LTM  self-test.
  7. G7 CHECK THE PINCH STRIP RETURN CIRCUIT 
    • Ignition ON.
    • Measure the resistance between left pinch strip C4172-2, circuit RPR52 (VT/GY), harness side and ground; and between right pinch strip C4173-2, circuit RPR52 (VT/GY), harness side and ground.
      Fig 6: Checking Pinch Strip Return Circuit
      G06070756Courtesy of FORD MOTOR CO.
    • Are the resistances less than 5 ohms? 
    • Yes:  INSTALL a new pinch strip. REFER to PINCH STRIP SWITCH . CLEAR the DTCs. REPEAT the LTM  self-test.
    • No:  GO to G8  .
  8. G8 CHECK THE PINCH STRIP RETURN CIRCUIT FOR AN OPEN 
    • Ignition OFF.
    • Disconnect: LTM  C4174B.
    • Measure the resistance between left pinch strip C4172-2, circuit RPR52 (VT/GY), harness side and LTM  C4174B-8, circuit RPR52 (VT/GY), harness side; and between right pinch strip C4173-2, circuit RPR52 (VT/GY), harness side and LTM  C4174B-8, circuit RPR52 (VT/GY), harness side.
      Fig 7: Checking Pinch Strip Return Circuit For Open
      G06070757Courtesy of FORD MOTOR CO.
    • Are the resistances less than 5 ohms? 
    • Yes:  GO to  G14.
    • No:  REPAIR the circuit. CLEAR the DTCs. REPEAT the LTM  self-test.
  9. G9 CHECK THE DETENT AND FORKBOLT SWITCH PIDs 
    • Enter the following diagnostic mode on the scan 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 REFERENCE CHART

      Liftgate Latch Position DETENTSW FORKBLT_S FKSWSEC
      Fully Unlatched Inactive (1) Active Active
      Primary Active Inactive Inactive
      (1) 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? 
    • Yes:  GO to  G14.
    • No:  GO to G10  .
  10. G10 CHECK THE OPERATION OF THE DETENT AND FORKBOLT SWITCHES 
    • Ignition OFF.
    • Disconnect: LTM  C4174B.
    • 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 REFERENCE CHART

      Liftgate Latch Position C4174B Circuit Resistance
      Fully Unlatched Pin 3, circuit CPR66 (GY/YE) Greater than 10,000 ohms (1)
      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
      (1) If resistance measured is less than 5 ohms, manually rotate the forkbolt to the latched position and retest.
      Fig 8: Measuring Resistance Between LTM C4174B, Harness Side And Ground
      G06070700Courtesy of FORD MOTOR CO.
    • Do the resistance values agree with the table? 
    • Yes:  GO to  G14.
    • No:  GO to G11  .
  11. G11 CHECK THE DETENT AND FORKBOLT SWITCH GROUND CIRCUIT 
    • Disconnect: Liftgate Latch/Unlatch Assembly C4188.
    • Measure the resistance between power liftgate latch/unlatch assembly C4188-8, circuit GD149 (BK/GY), harness side and ground.
      Fig 9: Measuring Resistance Between Power Liftgate Latch/Unlatch Assembly C4188-8, Circuit GD149 (BK/GY), Harness Side And Ground
      G06284323Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes:  GO to G12  .
    • No:  REPAIR the circuit. CLEAR the DTCs. REPEAT the LTM  self-test.
  12. G12 CHECK THE DETENT AND FORKBOLT SWITCH CIRCUITS FOR AN OPEN 
    • Measure the resistance between power liftgate latch/unlatch assembly C4188, harness side and LTM  C4174B, harness side using the following table:
      POWER LIFTGATE LATCH/UNLATCH ASSEMBLY REFERENCE CHART

      Power Liftgate Latch/Unlatch Assembly Circuit LTM 
      C4188-2 CPR64 (VT/OG) C4174B-5
      C4188-3 CPR65 (BU/GN) C4174B-4
      C4188-5 CPR66 (GY/YE) C4174B-3
      Fig 10: Measuring Resistance Between Power Liftgate Latch/Unlatch Assembly C4188 And LTM C4174B, Harness Side
      G06505731Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms on all circuits? 
    • Yes:  GO to G13  .
    • No:  REPAIR the circuit. CLEAR the DTCs. REPEAT the LTM  self-test.
  13. G13 CHECK THE DETENT AND FORKBOLT SWITCH CIRCUITS FOR A SHORT TO GROUND 
    • 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.
      Fig 11: Measuring Resistance Between LTM C4174B, Harness Side And Ground
      G06070700Courtesy of FORD MOTOR CO.
    • Are the resistances greater than 10,000 ohms on all circuits? 
    • 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 . CLEAR the DTCs. REPEAT the LTM  self-test.

    • No:  REPAIR the circuit. CLEAR the DTCs. REPEAT the LTM  self-test.
  14. G14 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? 
    • Yes:  INSTALL a new LTM  . REFER to LIFTGATE/TRUNK MODULE (LTM) . REPEAT the LTM  self-test.
    • 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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