Shift Interlock: Testing and Inspection

SHIFT INTERLOCK SYSTEM





The following chart describes the normal operation of the Brake Transmission Shift Interlock (BTSI) system. If the "expected response" differs from the vehicle's response, then system repair is necessary.

Refer to the following chart for expected shifter response, depending on ignition key/switch and brake pedal positions.

If the shifter cannot be moved out of the PARK position, refer to Shifter Locked In Place below. If the shift lever can be shifted out of PARK without the brake pedal depressed, refer to Circuit Test below.

SHIFTER LOCKED IN PLACE


1. Gain access to the brake transmission shift interlock (BTSI) solenoid. The solenoid is part of the shifter assembly.
2. Disconnect the wire connector from the rear of the BTSI solenoid.
3. Insert the ignition key and turn it to the ON position.
4. With the brakes applied, try moving the shifter out of the PARK position.
- If the lever now moves freely in and out of PARK, perform the Circuit Test.

If the shift lever now moves freely in and out of the park position, the BTSI solenoid is faulty and the shifter must be replaced. If the shift lever still does not move from the park position, the problem is in the shift lever assembly.

If the above test pass and the shifter can still be moved freely in and out of PARK without the brake pedal depressed, replace shifter assembly.