Infiniti I30 (A33). Manual — part 402
System Description
NHEL0190
Refer to Owner’s Manual for ASCD operating instructions.
POWER SUPPLY AND GROUND
NHEL0190S01
When ignition switch is in the ON or START position, power is supplied:
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through 10A fuse [No. 30, located in the fuse block (J/B)]
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to ASCD brake switch terminal 1 and
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to combination meter terminals 50 and 66,
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through 15A fuse [No. 20, located in the fuse block (J/B)]
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to park/neutral position relay terminal 1,
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through 10A fuse [No. 10, located in the fuse block (J/B)]
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to ASCD control unit terminal 5, and
Power is supplied at all times:
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through 15A fuse [No. 2, located in the fuse block (J/B)]
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to the stop lamp switch terminal 1, and
When park/neutral position is in the P or N position, ground is supplied:
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to park/neutral position relay terminal 2
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through park/neutral position switch and body grounds F41 and F39.
When ASCD main switch is depressed (ON), ground is supplied:
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to ASCD control unit terminal 11
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from ASCD steering switch terminal 1
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to ASCD steering switch terminal 2
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from ASCD control unit terminal 24.
then ASCD control unit holds CRUISE condition and illuminates CRUISE indicator.
Ground is supplied:
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to combination meter terminal 46
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from ASCD control unit terminal 15.
OPERATION
NHEL0190S02
Set Operation
NHEL0190S0201
To activate the ASCD, all of following conditions must exist.
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Ground supply to ASCD control unit terminal 11
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Power supply to ASCD control unit terminal 8 [Brake pedal is released and A/T selector lever is in other
than P and N position.]
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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:
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from ASCD steering switch terminal 2
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to ASCD control unit terminal 24.
And then ASCD pump is activated to control throttle wire and ASCD control unit supply ground
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to combination meter terminals 51 to illuminate SET indicator.
A/T Overdrive Control during Cruise Control Driving
NHEL0190S0202
When the vehicle speed is approximately 8 km/h (5 MPH) below set speed, a signal is sent
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from ASCD control unit terminal 10
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to TCM (transmission control module) terminal 24.
When this occurs, the TCM (transmission control module) cancels overdrive.
After vehicle speed is approximately 3 km/h (2 MPH) above set speed, overdrive is reactivated.
ASCD Shifting Control
NHEL0190S0207
During ASCD cruise, ASCD control unit controls A/T shifting to avoid uncomfortable shifting.
This is used to control the signals below.
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Throttle position sensor from ECM
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A/T shift solenoid valve A
GI
MA
EM
LC
EC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
IDX
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
System Description
EL-277
Coast Operation
NHEL0190S0203
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
NHEL0190S0204
When the RESUME/ACCEL switch is depressed, power is supplied
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from ASCD steering switch terminal 2
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to ASCD control unit terminal 24.
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 is reached to maximum controlled
speed by the system. And then ASCD will keep the new set speed.
Cancel Operation
NHEL0190S0205
When any of following condition exists, cruise operation will be canceled.
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CANCEL switch is depressed. (Power supply to ASCD control unit terminal 24)
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Brake pedal is depressed. (Power supply to ASCD control unit terminal 23 from stop lamp switch)
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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 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
NHEL0190S0206
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.
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Brake pedal is released.
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A/T selector lever is in other than P and N position.
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Vehicle speed is greater than 40 km/h (25 MPH) and 144 km/h (89 MPH).
ASCD PUMP OPERATION
NHEL0190S03
The ASCD pump consists of a vacuum motor, an air valve and a release valve. When the ASCD activates,
power is supplied
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from terminal 12 of ASCD control unit
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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-278
Schematic
NHEL0096
MEL459M
GI
MA
EM
LC
EC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
IDX
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
Schematic
EL-279
Wiring Diagram — ASCD —
NHEL0097
FIG. 1
NHEL0097S01
MEL460M
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
Wiring Diagram — ASCD —
EL-280
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