Infiniti F50. Manual — part 3
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
ACS-5
[ASCD]
C
D
E
F
G
H
I
J
L
M
A
B
ACS
●
to combination meter terminal 59
Power is supplied at all times:
●
through 15A fuse [No. 17, located in the fuse block (J/B) NO.1]
●
to the stop lamp switch terminal 1.
When park/neutral position is in the P or N position, ground is supplied:
●
to park/neutral position relay terminal 2
●
through body grounds E24 and E44.
When MAIN (CRUISE) switch is depressed (ON), ground is supplied:
●
to ASCD steering switch terminal 1
●
from ASCD control unit terminal 11.
●
to ASCD control unit terminal 24
●
from ASCD steering switch terminal 2.
then ASCD control unit holds CRUISE condition and illuminates CRUISE indicator.
Ground is supplied:
●
to combination meter terminal 63
●
from ASCD control unit terminal 15.
OPERATION
Set Operation
To activate the ASCD, all of following conditions must exist.
●
Power supply to ASCD control unit terminal 8. [Brake pedal is released and A/T selector lever is in a posi-
tion other than P or N.]
●
Vehicle speed is between 40 km/h (25 MPH) and 144 km/h (89 MPH). (Signal from combination meter)
When the SET/COAST switch is depressed, power is supplied:
●
from ASCD control unit terminal 11.
●
to ASCD steering switch terminal 1.
And then ASCD pump is activated to control throttle wire and ASCD control unit supply ground
●
to combination meter terminals 64 to illuminate SET indicator.
A/T Overdrive Control during Cruise Control Driving
When the vehicle speed is approximately 3 km/h (2 MPH) below set speed, a signal is sent
●
from ASCD control unit terminal 10
●
to TCM (transmission control module) through combination meter.
When this occurs, the TCM (transmission control module) cancels overdrive.
After vehicle speed is approximately 1 km/h (0.6 MPH) above set speed, overdrive is reactivated.
ASCD Shifting Control
During ASCD cruise, ASCD control unit controls A/T shifting to avoid uncomfortable shifting.
This is used to control the signals below.
●
Throttle position sensor from ECM
●
A/T shift solenoid valve A
Coast Operation
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
When the RESUME/ACCEL switch is depressed, power is supplied
●
from ASCD control unit terminal 11
●
to ASCD steering switch terminal 1.
If the RESUME/ACCEL switch 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 reaches the maximum speed
controlled by the system. ASCD will then keep the new set speed.
ACS-6
[ASCD]
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
Cancel Operation
When any of following conditions exist, cruise operation will be canceled.
●
CANCEL switch is depressed. (Power supply to ASCD control unit terminal 11)
●
Brake pedal is depressed. (Power supply to ASCD control unit terminal 23 from stop lamp switch)
●
Brake pedal is depressed or A/T selector lever is shifted to P or N position. (Power supply to ASCD con-
trol unit terminal 8 is interrupted.)
If MAIN (CRUISE) switch is turned to OFF during ASCD activation, all ASCD operations will be canceled and
vehicle speed memory will be erased.
Resume Operation
When the RESUME/ACCEL switch is depressed after cancel operation other than when depressing MAIN
(CRUISE) switch is performed, vehicle speed will return to last set speed. To resume vehicle set speed, vehi-
cle condition must meet following conditions.
●
Brake pedal is released.
●
A/T selector lever is in other than P and N position.
●
Vehicle speed is greater than 40 km/h (25 MPH) and less than 144 km/h (89 MPH).
ASCD PUMP OPERATION
The ASCD pump consists of a vacuum motor, an air valve and a release valve. When the ASCD activates,
power is supplied
●
from ASCD control unit terminal 12
●
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 affects the diaphragm of ASCD actuator to control throttle cable.
*1: When power and ground is supplied, valve is closed.
*2: Set position held.
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
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
ACS-7
[ASCD]
C
D
E
F
G
H
I
J
L
M
A
B
ACS
Schematic
EKS003O9
TBWM0059E
ACS-8
[ASCD]
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
Wiring Diagram — ASCD —
EKS003OA
FIG. 1
TKWM0441E
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