Pinpoint Test A: The Shift Interlock System Does Not Release/Lock Correctly

Test Step

A1 CHECK THE POWER SUPPLY TO THE SHIFT LOCK ACTUATOR - CIRCUIT 810 (RD/LG)

NOTE: Test Step A1 diagnoses why the shift interlock system does not release correctly. If the shift interlock system does not lock correctly, GO to Step A3.

Key in OFF position.
Disconnect: Shift Lock Actuator C232.
Key in ON position.
Apply the brake pedal.
Measure the voltage between the shift lock actuator C232 pin 1, circuit 810 (RD/LG), harness side and ground.

Fig 1: Checking Power Supply To Shift Lock Actuator - Circuit 810 (RD/LG)
Courtesy of FORD MOTOR CO.
Is the voltage greater than 10 volts

Result / Action to Take

Yes

INSTALL a new shift lock actuator.

REFER to BRAKE SHIFT INTERLOCK ACTUATOR . TEST the system for normal operation.

GO to A2.

Test Step

A2 CHECK THE POWER SUPPLY TO THE SHIFT LOCK ACTUATOR - CIRCUIT 511 (LG)

Apply the brake pedal.
Measure the voltage between Fuse 20, circuit 511 (LG) and ground.

Fig 2: Checking Power Supply To Shift Lock Actuator - Circuit 511 (LG)
Courtesy of FORD MOTOR CO.
Is the voltage greater than 10 volts?

Result / Action to Take

Yes

REPAIR circuit 810 (RD/LG). RECONNECT all components. TEST the system for normal operation.

REPAIR circuit 511 (LG). RECONNECT all components. TEST the system for normal operation.

Test Step

A3 CHECK THE POWER SUPPLY TO THE SHIFT LOCK ACTUATOR - CIRCUIT 296 (WH/VT)

Key in OFF position.
Disconnect: Shift Lock Actuator C232.
Key in ON position.
Measure the voltage between the shift lock actuator C232 pin 3, circuit 296 (WH/VT), harness side and ground.

Fig 3: Checking Power Supply To Shift Lock Actuator - Circuit 296 (WH/VT)
Courtesy of FORD MOTOR CO.
Is the voltage greater than 10 volts?

Result / Action to Take

Yes

GO to A4.

REPAIR circuit 296 (WH/VT). RECONNECT all components. TEST the system for normal operation.

Test Step

A4 CHECK CIRCUIT 57 (BK) FOR AN OPEN

Key in OFF position.
Measure the resistance between the shift lock actuator C232 pin 2, circuit 57 (BK), harness side and ground.

Fig 4: Checking Circuit 57 (BK) For An Open
Courtesy of FORD MOTOR CO.
Is the resistance less than 5 ohms?

Result / Action to Take

Yes

INSTALL a new shift lock actuator. REFER to BRAKE SHIFT INTERLOCK ACTUATOR . TEST the system for normal operation.

REPAIR circuit 57 (BK). RECONNECT all components. TEST the system for normal operation.