Pinpoint Test V: Manual Door Lock Cylinder Inoperative

Handles, Locks, Latches and Entry Systems

Pinpoint Test V: Manual Door Lock Cylinder Inoperative

Normal Operation

The door lock cylinder is connected to the door latch via a lock rod and can be used to manually lock/unlock a door.

This pinpoint test is intended to diagnose the following:

- Bent or binding lock rod and lever

- Door lock cylinder

- Door latch

PINPOINT TEST V : MANUAL DOOR LOCK CYLINDER INOPERATIVE

V1 CHECK THE LOCK AND UNLOCK OPERATION

- Insert a key into the lock cylinder and rotate the lock cylinder to the lock and unlock positions.

Does the door lock cylinder freely rotate without locking and unlocking the door?

Yes
GO to V2.

No
GO to V3.

V2 CHECK THE DOOR LOCK CYLINDER

- Remove the door lock cylinder. Refer to Door Lock Cylinder Service and Repair.

- Operate the door lock cylinder with the key while holding the lever on the lock cylinder.

Does the key in the door lock cylinder rotate freely while the lever is stationary?

Yes
INSTALL a new door lock cylinder. REFER to Door Lock Cylinder Service and Repair. TEST the system for normal operation.

No
GO to V5.

V3 CHECK THE LOCK CYLINDER OPERATION AFTER LUBRICATION

- Spray a lock lubricant such as Motorcraft(TM) XL-1 into the lock cylinder opening for a couple seconds.

- Operate the door lock cylinder with the key.

Does the door lock and unlock using the door lock cylinder?

Yes
The concern was caused by an insufficiently lubricated lock cylinder. SPRAY a multi-purpose grease such as Motorcraft(TM) XL-5 into the lock cylinder for a couple seconds to provide long term lubrication.

No
GO to V4.

V4 CHECK THE DOOR LOCK CYLINDER

- Remove the door lock cylinder. Refer to Door Lock Cylinder Service and Repair.

- Operate the door lock cylinder with the key.

Does the door lock cylinder rotate freely?

Yes
GO to V5.

No
INSTALL a new door lock cylinder. REFER to Door Lock Cylinder Service and Repair. TEST the system for normal operation.

V5 CHECK THE DOOR LOCK CYLINDER LINKAGE

- Operate the door lock cylinder while observing the linkage.

Is the door lock cylinder rod and lever bent or binding?

Yes
REPAIR as necessary. TEST the system for normal operation.

No
INSTALL a new door latch. REFER to Front Door Latch Removal and Replacement. TEST the system for normal operation.