Brake Transmission Shift Interlock; Description; Operation; Diagnosis And Testing - Brake Transmission Shift Interlock - Jeep 2002 WJ Service Manual

21a - 44 TRANSMISSION AND TRANSFER CASE
BRAKE TRANSMISSION SHIFT
INTERLOCK MECHANISM

DESCRIPTION

The Brake Transmission Shifter/Ignition Interlock
(BTSI), is a cable and solenoid operated system. It
interconnects the automatic
mounted shifter to the steering column ignition
switch (Fig. 46).

OPERATION

The system locks the shifter into the PARK posi-
tion. The interlock system is engaged whenever the
ignition switch is in the LOCK or ACCESSORY posi-
tion. An additional electrically activated feature will
prevent shifting out of the PARK position unless the
brake pedal is depressed approximately one-half an
inch. A magnetic holding device in the shifter assem-
bly is energized when the ignition is in the RUN
position. When the key is in the RUN position and
the brake pedal is depressed, the shifter is unlocked
and will move into any gear position. The interlock
system also prevents the ignition switch from being
turned to the LOCK or ACCESSORY position, unless
the shifter is fully locked into the PARK position.
1 - SHIFT MECHANISM
2 - SHIFTER BTSI LEVER
3 - ADJUSTMENT CLIP
transmission floor
Fig. 46 Ignition Interlock Cable
DIAGNOSIS AND TESTING - BRAKE
TRANSMISSION SHIFT INTERLOCK
SYSTEM VERIFICATION
(1) Verify that the key can only be removed in the
PARK position
(2) When the shift lever is in PARK And the shift
handle pushbutton is in the "OUT" position, the igni-
tion key cylinder should rotate freely from OFF to
LOCK. When the shifter is in any other gear or neu-
tral position, the ignition key cylinder should not
rotate to the LOCK position.
(3) Shifting out of PARK should not be possible
when the ignition key cylinder is in the OFF posi-
tion.
(4) Shifting out of PARK should not be possible
while applying normal pushbutton force and ignition
key cylinder is in the RUN or START positions
unless the foot brake pedal is depressed approxi-
mately 1/2 inch (12mm).
(5) Shifting out of PARK should not be possible
when the ignition key cylinder is in the ACCESSORY
or LOCK positions.
(6) Shifting between any gears, NEUTRAL or into
PARK may be done without depressing foot brake
pedal with ignition switch in RUN or START posi-
tions.
4 - STEERING COLUMN ASSEMBLY
5 - INTERLOCK CABLE
WG