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I A/T shift solenoid valve A
Coast Operation
NAEL0371S0204
When the SET/COAST switch is depressed during cruise control driving, ASCD actuator returns the throttle
cable to decrease vehicle set speed until the switch is released. And then ASCD will keep the new set speed.
Accel Operation
NAEL0371S0205
When the RESUME/ACCEL switch is depressed, power is supplied
I from ASCD steering switch terminal 3
I to ASCD control unit terminal 24.
If the RESUME/ACCELswitch is depressed during cruise control driving,ASCD actuator pulls the throttle cable
to increase the vehicle speed until the switch is released or vehicle speed is reached to maximum controlled
speed by the system. And then ASCD will keep the new set speed.
Cancel Operation
NAEL0371S0206
When any of following condition exists, cruise operation will be canceled.
I CANCEL switch is depressed. (Power supply to ASCD control unit terminals 11 and 24)
I Brake pedal is depressed. (Power supply to ASCD control unit terminal 23 from stop lamp switch)
I Brake pedal or clutch pedal is depressed (M/T models)/brake pedal is depressed or A/T selector lever is
shifted to P or N position (A/T models). (Power supply to ASCD control unit terminal 8 is interrupted.)
If MAIN switch is turned to OFF during ASCD is activated, all of ASCD operation will be canceled and vehicle
speed memory will be erased.
Resume Operation
NAEL0371S0207
When the RESUME/ACCEL switch is depressed after cancel operation other than depressing MAIN switch is
performed, vehicle speed will return to last set speed. To resume vehicle set speed, vehicle condition must
meet following conditions.
I Brake pedal is released.
I Clutch pedal is released (M/T models).
I A/T selector lever is in other than P and N position (A/T models).
I Vehicle speed is between 40 km/h (25 MPH) and 144 km/h (89 MPH).
ASCD PUMP OPERATION
NAEL0371S03
The ASCD pump consists of a vacuum motor, an air valve and a release valve. When the ASCD activates,
power is supplied
I from terminal 12 of ASCD control unit
I to ASCD pump terminal 1.
Ground is supplied to vacuum motor, air valve and release valve from ASCD control unit depending on the
operated condition as shown in the below table.
The pump is connected to ASCD actuator by vacuum hose. When the ASCD pump is activated, the ASCD
pump vacuum the diaphragm of ASCD actuator to control throttle cable.
Air valve (*1) Release valve (*1) Vacuum motor
Actuator inner pres-
sure
ASCD not operating Open Open Stopped Atmosphere
ASCD operating
Releasing throttle
cable
Open Closed Stopped Vacuum
Holding throttle
position
Closed Closed Stopped Vacuum (*2)
Pulling throttle cable Closed Closed Operated Vacuum
*1: When power and ground is supplied, valve is closed.
*2: Set position held.
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
System Description (Cont’d)
EL-250
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