System Description

POWER SUPPLY AND GROUND
When ignition switch is in the ON or START position, power is supplied
^ through 10 A fuse [No.8, located in the fuse block (J/B)]
^ to ASCD hold relay terminal 5 and
^ to ASCD main switch terminal 1.

When ASCD main switch is in ON position, power is supplied
^ from ASCD main switch terminal 3
^ to ASCD hold relay terminal 2.

Ground is supplied
^ to ASCD hold relay terminal 1
^ through body grounds M15, M71 and M76.

With power and ground is supplied, the ASCD hold relay is energized, then power is supplied
^ from ASCD hold relay terminal 3
^ to ASCD control unit terminal 4 and
^ to ASCD main switch terminal 2.

After the ASCD main switch is released, power remains supplied
^ to the coil circuit of ASCD hold relay
^ through ASCD main switch terminals 2 and 3.

This power supply is kept until any of following conditions exist.
^ Ignition switch is returned to the ACC or OFF position.
^ ASCD main switch is turned to OFF position.

During ASCD hold relay is energized power is also supplied to ASCD control unit terminal 5
^ through ASCD brake switch, ASCD hold relay and park/neutral position relay, (A/T models) or
^ through ASCD hold relay, ASCD clutch switch and ASCD brake switch, (M/T models).

Ground is supplied
^ to ASCD control unit terminal 3
^ through body grounds M15, M71 and M76.

Inputs
At this point, the system is ready to activate or deactivate, based on inputs from the following:
^ speedometer in the combination meter
^ stop lamp switch
^ ASCD steering switch
^ park/neutral position relay (A/T models)
^ ASCD brake switch.
^ ASCD clutch switch (M/T models)

A vehicle speed input signal is supplied
^ to ASCD control unit terminal 7
^ from terminal 32 of the combination meter.

Power is supplied at all times
^ to stop lamp switch terminal 1
^ through 15 A fuse [No.14, located in the fuse block (J/B)].

When the brake pedal is depressed, power is supplied
^ from terminal 2 of the stop lamp switch
^ to ASCD control unit terminal 11.

Power is supplied at all times
^ through 10 A fuse [No.36, located in the fuse and fusible link box]
^ to horn low relay terminal 2 and
^ through 10 A fuse [No.41, located in the fuse and fusible link box]
^ to horn high relay terminal 2
^ through terminal 1 of each horn relay
^ to ASCD steering switch terminal 21.

When the SET/COAST switch is depressed, power is supplied
^ from terminal 23 of the ASCD steering switch
^ to ASCD control unit terminal 2.

When the RESUME/ACCEL switch is depressed, power is supplied
^ from terminal 22 of the ASCD steering switch
^ to ASCD control unit terminal 1.

When the system is activated, power is supplied
^ to ASCD control unit terminal 5.

Power is interrupted when
^ the selector lever is placed in P or N or
^ the ASCD brake switch is depressed or
^ the ASCD clutch switch is depressed (M/T models).

Outputs
The ASCD actuator controls the throttle drum via the ASCD wire based on inputs from the ASCD control unit.

The ASCD pump consists of a vacuum motor, an air valve, and a release valve.

Power is supplied
^ from terminal 8 of the ASCD control unit
^ to ASCD pump terminal 1.

Ground is supplied to the vacuum motor
^ from terminal 9 of the ASCD control unit
^ to ASCD pump terminal 4.

Ground is supplied to the air valve
^ from terminal 10 of the ASCD control unit
^ to ASCD pump terminal 2.

Ground is supplied to the release valve
^ from terminal 14 of the ASCD control unit
^ to ASCD pump terminal 3.

When the system is activated, power is supplied
^ from terminal 13 of the ASCD control unit
^ to combination meter terminal 40 and
^ to TCM (Transmission control module) terminal 18.

Ground is supplied
^ to combination meter terminal 39
^ through body grounds M15, M71 and M76.

With power and ground supplied, the CRUISE indicator illuminates.

When vehicle speed is approximately 8 kph (5 MPH) below set speed, a signal is sent
^ from terminal 12 of the ASCD control unit
^ to TCM (Transmission control module) terminal 24.

When this occurs, the TCM (Transmission control module) cancels overdrive.

After vehicle speed is approximately 3 kph (2 MPH) above set speed, overdrive is reactivated.