Symptom Charts

Use the symptom chart as an aid in determining possible conditions, sources and necessary service actions for shift control linkage.

SHIFT CONTROL LINKAGE

Condition	Possible Source	Action
Brake Shift Interlock System Does Not Release or Lock Properly	Circuitry open/shorted. Blown fuse. Damaged brake on/off (BOO) switch. Damaged brake shift lock actuator.	GO to Pinpoint Test A.
Shift Control Linkage Binding, Out of Proper Gear Relationship	Damaged ignition/shifter interlock cable. Loose ignition/shifter interlock cable. Loose retainer bracket. Shift linkage misadjusted.	GO to Pinpoint Test B.
Transmission Control Switch (TCS) and Indicator Lamp Not Operating Properly	Damaged control switch. Circuitry open/shorted. Blown fuse. Burned-out miniature bulb. Damaged powertrain control module. Damaged transmission control module.	GO to Pinpoint Test C.

BRAKE-SHIFT INTERLOCK SWITCH

Condition	Possible Source	Action
Cannot Shift from Park with Brake Depressed	No voltage signal from brake circuit.	CHECK voltage at wire terminal. If no voltage when brake is depressed, REPAIR circuit.
	Large voltage difference between brake/ignition circuit.	MEASURE the voltage difference between ignition input and brake input — not to exceed 2 volts. REPAIR circuit.
	Broken/seized solenoid.	INSPECT latch assembly and plunger. LUBRICATE or REPLACE.
	Solenoid electrically worn or damaged.	REPLACE solenoid.
Can Shift from Park Without Depressing Brake	No power to solenoid.	CHECK solenoid wire terminals for power in ignition circuit and proper ground.
	Broken/seized solenoid.	INSPECT latch assembly and plunger. LUBRICATE or REPLACE.
	Solenoid electrically worn or damaged.	REPLACE solenoid.

Solenoid Operation Table