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System Description
NAEL0371
Refer to Owner’s Manual for ASCD operating instructions.
POWER SUPPLY AND GROUND
NAEL0371S01
Power is supplied at all times:
I through 10A fuse [No. 14, located in the fuse block (J/B)]
I to the stop lamp switch terminal 1, and
I through 7.5A fuse (No. 52, located in fuse and fusible link box)
I to the horn relay terminals 1 and 3.
When ignition switch is in the ON or START position, power is supplied:
I through 7.5A fuse [No. 11, located in the fuse block (J/B)]
I to ASCD brake switch terminal 1 and
I to ASCD control unit terminal 5,
I through 10A fuse [No. 18, located in the fuse block (J/B)]
I to park/neutral position relay terminal 1,
I through 10A fuse [No. 8, located in the fuse block (J/B)]
I to combination meter terminal 66, and
When park/neutral position switch is in the P or N position (A/T models), ground is supplied:
I to park/neutral position relay terminal 2
I through park/neutral position switch and body grounds B55 and B75.
When ASCD main switch is depressed (ON), ground is supplied:
I to ASCD control unit terminal 9
I from ASCD steering switch terminal 4
I to ASCD steering switch terminal 5
I through body grounds M4, M66 and M147
then ASCD control unit holds CRUISE condition and illuminates CRUISE indicator.
Ground is supplied:
I from ASCD control unit terminal 15
I to combination meter terminal 46.
OPERATION
NAEL0371S02
Set Operation
NAEL0371S0201
To activate the ASCD, all following conditions must exist.
I Ground is supplied to ASCD control unit terminal 9 (Main switch is in ON position.)
I Power is supplied to ASCD control unit terminal 8 [Brake pedal and clutch pedal are released (M/T mod-
els) and brake pedal is released and 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). (Signal from combination meter)
When the SET/COAST switch is depressed, power is supplied:
I from ASCD steering switch terminal 2
I to ASCD control unit terminal 11.
And then ASCD pump is activated to control throttle wire and ASCD control unit supply ground
I to combination meter terminals 51 to illuminate SET indicator.
A/T Overdrive Control during Cruise Control Driving (A/T models)
NAEL0371S0202
When the vehicle speed is approximately 3 km/h (2 MPH) below set speed, a signal is sent
I from ASCD control unit terminal 10
I to TCM (transmission control module) terminal 24.
When this occurs, the TCM (transmission control module) cancels overdrive.
After vehicle speed is approximately 1 km/h (1 MPH) below set speed, overdrive is reactivated.
ASCD Shifting Control (A/T models)
NAEL0371S0203
During ASCD cruise, ASCD control unit controls A/T shifting to avoid uncomfortable shifting.
This is used to control the signals below.
I Throttle position sensor from ECM
GI
MA
EM
LC
EC
FE
CL
MT
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
IDX
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
System Description
EL-249
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