PINPOINT TEST F: The Power Liftgate Does Not Power Close (Power Open Ok)

WARNING: This page is about a different car, the 2013 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.

F1 CHECK THE MANUAL OPERATION OF THE LIFTGATE
- While manually opening and closing the liftgate, check the liftgate for:
  - liftgate/wedge alignment
  - strut operation (struts should push liftgate open when beyond half open)
  - hinges (should move freely)
  Does the liftgate open and close correctly?
  
  Yes : GO to F2.
  
  No : REPAIR and ALIGN as necessary. Refer to LIFTGATE ALIGNMENT .
F2 CHECK THE LIFTGATE LEFT/RIGHT PINCH STRIP STATUS (LFT_PINCH/RT_PINCH) OPERATION
- Using the scan tool, view the LTM PIDs .
- Monitor the LTM PIDs LFT_PINCH and RT_PINCH while activating the left and right pinch strips.
  Do the PIDs states change/agree with the pinch strip status?
  
  Yes : GO to F10.
  
  No : GO to F3.

F3 CHECK THE PINCH STRIP SIGNAL CIRCUIT

Disconnect: Inoperative Pinch Strip.

For an inoperative left pinch strip, measure:

Positive Lead	Measurement/Action	Negative Lead
C4172-1		Ground

For an inoperative right pinch strip, measure

Positive Lead	Measurement/Action	Negative Lead
C4173-1		Ground

Is the voltage approximately 5 volts?

Yes : GO to F7.

No : If the voltage measured was greater than 5 volts, GO to F4.

If the voltage measured was less than 5 volts, GO to F5.

F4 CHECK THE PINCH STRIP SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE

Ignition OFF.
Disconnect: LTM C4174B.
Ignition ON.

For an inoperative left pinch strip, measure:

Positive Lead	Measurement/Action	Negative Lead
C4172-1		Ground

For an inoperative right pinch strip, measure:

Positive Lead	Measurement/Action	Negative Lead
C4173-1		Ground

Is any voltage present?

Yes : REPAIR the circuit in question.

No : GO to F5.

F5 CHECK THE PINCH STRIP SIGNAL CIRCUIT FOR A SHORT TO GROUND

Ignition OFF.
Disconnect: LTM C4174B.

For an inoperative left pinch strip, measure:

Positive Lead	Measurement/Action	Negative Lead
C4172-1		Ground

For an inoperative right pinch strip, measure:

Positive Lead	Measurement/Action	Negative Lead
C4173-1		Ground

Is the resistance greater than 10, 000 ohms?

Yes : GO to F6.

No : REPAIR the circuit in question.

F6 CHECK THE PINCH STRIP SIGNAL CIRCUIT FOR AN OPEN

For an inoperative left pinch strip, measure:

Positive Lead	Measurement/Action	Negative Lead
C4172-1		C4174B-12

For an inoperative right pinch strip, measure:

Positive Lead	Measurement/Action	Negative Lead
C4173-1		C4174B-14

Is the resistance less than 3 ohms?

Yes : GO to F11.

No : REPAIR the circuit in question.

F7 CHECK THE PINCH STRIP RETURN CIRCUIT

Ignition ON.

For an inoperative left pinch strip, measure:

Positive Lead	Measurement/Action	Negative Lead
C4172-1		C4172-2

For an inoperative right pinch strip, measure:

Positive Lead	Measurement/Action	Negative Lead
C4173-1		C4173-2

Is the voltage approximately 5 volts?

Yes : INSTALL a new pinch strip for the pinch strip in question. Refer to Pinch Strip Switch .

No : GO to F8.

F8 CHECK THE PINCH STRIP RETURN CIRCUIT FOR SHORT TO VOLTAGE

Ignition OFF.
Disconnect: LTM C4174B.
Ignition ON.

For an inoperative left pinch strip, measure:

Positive Lead	Measurement/Action	Negative Lead
C4172-2		Ground

For an inoperative right pinch strip, measure:

Positive Lead	Measurement/Action	Negative Lead
C4173-2		Ground

Is any voltage present?

Yes : REPAIR the circuit.

No : GO to F9.

F9 CHECK THE PINCH STRIP RETURN CIRCUIT FOR AN OPEN

For an inoperative left pinch strip, measure:

Positive Lead	Measurement/Action	Negative Lead
C4172-2		C4174B-21

For an inoperative right pinch strip, measure:

Positive Lead	Measurement/Action	Negative Lead
C4173-2		C4174B-21

Is the resistance less than 3 ohms?

Yes : GO to F11.

No : REPAIR the circuit.

F10 CHECK THE DETENT AND FORKBOLT SWITCH PIDs

Using the the scan tool, view LTM PIDs .
Operate the liftgate manually while monitoring the LTM PIDs :
- Detent Switch Status (DETENTSW)
- Forkbolt Switch Status (FORKBLT_S)
- Forkbolt Secondary Switch (FKSWSEC)

Begin with the liftgate in the open position, then slowly close the liftgate into each of the latch positions specified.

Liftgate Latch Position	DETENTSW	FORKBLT_S	FKSWSEC
Fully unlatched	Inactive	Active	Active
Primary	Active	Inactive	Inactive

Do the switch states agree with the table?

Yes : GO to F11.

No : GO to PINPOINT TEST L .

F11 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.