Chrysler Conquest 1988 Service Manual page 619

AUTOMATIC SPEED CONTROL (ASC) SYSTEM - Outline
14-91
Reed.swZch type
12R005C
Control unit
68Y531
VEHICLE SPEED SENSOR
The vehicle speed sensor sends to the ECU a pulse signal
proportional to the rotating speed (vehicle speed) of the output
gear of the transmission. It is mounted in the speedometer.
The sensor is of the reed switch type, and generates four pulse
signals at every rotation of the output gear. The sensor is
shared in common by other electronic control systems and in
the event of failure of the sensor itself, some troubles will
occur in all systems using it so that the failure of the sensor can
be known easily. The vehicle speed sensor input terminal of the
ECU is pulled up to about 12 V power via a diode and resistor as
illustrated.
ASC CONTROL SWITCH
The MAIN switch to turn on/off the ASC control unit power and
the ASC command input switches (SET switch and RESUME
switch) are mounted on the column switch lever to the right of
the driver.
1
Fusible link
~I--~CC(II Ground
\d
ignition switch Regulated power
supply circuit
Micro-
computer
I
MAIN
- SET
0
RESUME
0
_I
Control unit
Ground
Actuator
solenoid valve
Indicator
16Y2896