Automotive Electrical and Electronic Systems Classroom Manual Fifth Edition Update by John F. Kershaw

Starting System Operation 187
Figure 9-7.
Column-mounted neutral safety switch near gearshift tube. (GM Service and Parts Operations)
Figure 9-8. Transmission-mounted safety switch.
(DaimlerChrysler Corporation)
the microprocessor of the position of the manual
lever shaft. This signal is used to determine the
desired gear and electronic pressure control. The
switch is now called a manual lever position
switch (MLPS).
General Motors has done essentially the same
as Ford, renaming the PARK/NEUTRAL switch
used on its 4T65E and 4T80E transaxles. It
now is called either a PRNDL switch or a
PARK/NEUTRAL position switch and provides
input to the PCM regarding torque converter
clutch slip. This input allows the PCM to make
Figure 9-9. A mechanical device within the steering
column blocks the movement of the ignition switch.
the necessary calculations to control clutch apply
and release feel.
Manual Transmissions/
Transaxles
The starting safety switch used with a manual
transmission on older vehicles is usually an electrical
switch similar to those shown in Figures 9-7
and 9-8. A clutch start switch (also called an
interlock switch) is commonly used with manual