signal to the Instrument Cluster to display vehicle
speed to the driver. The vehicle speed signal pulse is
roughly 8000 pulses per mile.
BRAKE TRANSMISSION SHIFT INTERLOCK
SYSTEM (FLOOR SHIFT)
DESCRIPTION
The Brake Transmission Shifter/Ignition Interlock
(BTSI) is a cable and solenoid operated system that
prevents the transmission gear shifter from being
moved out of PARK without a driver in place.
Refer to the following chart that expected shifter
response, depending on ignition key/switch (Fig. 26)
and brake pedal positions.
OPERATION
The Brake Transmission Shifter/Ignition Interlock
(BTSI) is engaged whenever the ignition switch is in
the LOCK or ACCESSORY position (Fig. 26). An
additional electrically activated feature will prevent
shifting out of the PARK position unless the brake
pedal is depressed at least one-half inch. A magnetic
holding device integral to the interlock cable is ener-
gized when the ignition is in the ON/RUN position.
When the key is in the ON/RUN position and the
brake pedal is depressed, the shifter is unlocked and
will move into any position. The interlock system
also prevents the ignition switch from being turned
to the LOCK or ACCESSORY position, unless the
shifter is in the gated PARK position.
The following chart describes the normal operation
of the Brake Transmission Shift Interlock (BTSI) sys-
tem. If the “expected response” differs from the vehi-
cle’s response, then system repair and/or adjustment
is necessary.
BRAKE TRANSMISSION SHIFT INTERLOCK
SYSTEM (COLUMN SHIFT)
DESCRIPTION
Vehicles equipped with a column shifter utilize a
brake transmission shift interlock (BTSI) solenoid,
which prevents the transmission gear shifter from
Fig. 25 Sensor Relation to Planet Carrier Park Pawl
Lugs
1 – OUTPUT SPEED SENSOR
2 – REAR PLANET CARRIER/OUTPUT SHAFT ASSEMBLY
3 – TRANSAXLE CASE
Fig. 26 Ignition Key/Switch Positions
1 – ACC
2 – LOCK
3 – OFF
4 – ON/RUN
5–START
ACTION EXPECTED RESPONSE
1. Turn key to the “OFF”
position.
1. Shifter CAN be shifted
out of park.
2. Turn key to the
9ON/RUN” position.
2. Shifter CANNOT be
shifted out of park.
3. Turn key to the
“ON/RUN” position and
depress the brake pedal.
3. Shifter CAN be shifted
out of park.
4. Leave shifter in any
gear and try to return key
to the “LOCK” or 9ACC”
position.
4. Key cannot be
returned to the “LOCK” or
“ACC” position.
5. Return shifter to
“PARK” and try to remove
the key.
5. Key can be removed
(after returning to “LOCK”
position).
6. With the key removed,
try to shift out of “PARK”.
6. Shifter cannot be
shifted out of “PARK”.
NOTE: Any failure to meet these expected
responses requires system adjustment or repair.
21 - 18 42LE TRANSAXLE LH
DESCRIPTION AND OPERATION (Continued)
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