Infiniti M45 (Y34). Manual — part 5
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
ACS-13
[ASCD]
C
D
E
F
G
H
I
J
L
M
A
B
ACS
FIG. 6
TKWA0673E
ACS-14
[ASCD]
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
Fail-Safe System
AKS002PF
DESCRIPTION
When the fail-safe system senses a malfunction, it deactivates
ASCD operation. The SET indicator in the combination meter will
then flash.
MALFUNCTION DETECTION CONDITIONS
CONSULT-II Inspection Procedure
AKS002PG
1.
Turn ignition switch OFF.
2.
Connect CONSULT-II and CONSULT-ll CONVERTER to data
link connector.
3.
Turn ignition switch ON.
4.
Turn ASCD main switch ON.
5.
Touch START (NISSAN BASED VHCL) (on CONSULT-II dis-
play).
6.
Touch ASCD.
If “ASCD” is not indicated, go to
PBIC0201E
Detection conditions
ASCD operation during malfunc-
tion detection
●
ASCD steering (RESUME/ACCEL, CANCEL, SET/COAST) switch is stuck.
●
Vacuum motor ground circuit or power circuit is open or shorted.
●
Air valve ground circuit or power circuit is open or shorted.
●
Release valve ground circuit or power circuit is open or shorted.
●
Vehicle speed sensor is faulty.
●
ASCD control unit internal circuit is malfunctioning.
●
ASCD is deactivated.
●
Vehicle speed memory is can-
celed.
●
ASCD brake switch or stop lamp switch is faulty.
●
ASCD is deactivated.
●
Vehicle speed memory is not
canceled.
SHIA0179E
SKIA3098E
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
ACS-15
[ASCD]
C
D
E
F
G
H
I
J
L
M
A
B
ACS
7.
Touch SELF-DIAG RESULTS.
●
Self-diagnostic results are shown on display.
Refer to
ACS-15, "CONSULT-II Self-Diagnostic Results"
table.
8.
Touch DATA MONITOR.
●
Touch START.
●
Data monitor results are shown on display.
Refer to
ACS-16, "CONSULT-II Data Monitor"
table.
For further information, read the CONSULT-II Operation
Manual.
CONSULT-II Self-Diagnostic Results
AKS002PH
PEL041P
PFA021B
PEL043P
PEL811S
Diagnostic item
Description
Repair/Check order
NO DTC IS DETECTED.
FURTHER TESTING
MAY BE REQUIRED.
●
Even if no malfunction is indicated, further testing may be
required as far as the customer complains.
—
POWER SUPPLY-VALVE
●
The power supply circuit for the ASCD pump is open. (A
malfunction high voltage is entered.)
ASCD PUMP CIRCUIT CHECK
VACUUM PUMP
●
The vacuum motor circuit is open or shorted. (A malfunc-
tion high or low voltage is entered.)
ASCD PUMP CIRCUIT CHECK
ACS-16
[ASCD]
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
CONSULT-II Data Monitor
AKS002PI
AIR VALVE
●
The air valve circuit is open or shorted. (A malfunction
high or low voltage is entered.)
ASCD PUMP CIRCUIT CHECK
RELEASE VALVE
●
The release valve circuit is open or shorted. (A malfunc-
tion high or low voltage is entered.)
ASCD PUMP CIRCUIT CHECK
VHCL SP·S/FAILSAFE
●
The vehicle speed sensor is malfunctioning.
VEHICLE SPEED SENSOR
CHECK
CONTROL UNIT
●
The ASCD control unit is malfunctioning.
Replace ASCD control unit
BRAKE SW/STOP/L SW
●
The brake switch or stop lamp switch circuit is malfunc-
tioning.
ASCD BRAKE/STOP LAMP
SWITCH CHECK
COMMAND SW
●
The steering switch (SET/COAST switch, RESUME/
ACCEL switch or CANCEL switch) is malfunctioning.
ASCD STEERING SWITCH
CHECK
ECM
●
The ECM is malfunctioning.
Diagnostic item
Description
Repair/Check order
Monitored item
Description
BRAKE SW
●
Indicates [ON/OFF] condition of the brake switch and park/neutral position relay.
AT OD MONITOR
●
Indicates [ON/OFF] condition of A/T O/D (shift solenoid valve A).
STOP LAMP SW
●
Indicates [ON/OFF] condition of the stop lamp switch.
MAIN SW
●
Indicates [ON/OFF] condition of MAIN (CRUISE) switch.
SET SW
●
Indicates [ON/OFF] condition of the SET switch.
RESUME/ACC SW
●
Indicates [ON/OFF] condition of the RESUME/ACCEL switch.
CANCEL SW
●
Indicates [ON/OFF] condition of the CANCEL switch.
VHCL SPEED SE
●
The present vehicle speed computed from the vehicle speed sensor signal is displayed.
SET VHCL SPD
●
The preset vehicle speed is displayed.
VACUUM PUMP
●
The operation time of the vacuum pump is displayed.
AIR VALVE
●
The operation time of the air valve is displayed.
PW SUP-VALVE
●
Indicates [ON/OFF] condition of the circuit for the air valve and the release valve.
CRUISE LAMP
●
Indicates [ON/OFF] condition of the set lamp.
MAIN LAMP
●
Indicates [ON/OFF] condition of cruise lamp.
A/T·OD CANCEL
●
Indicates [ON/OFF] condition of the OD cancel.
FAIL SAFE·LOW
●
The fail-safe (LOW) circuit function is displayed.
FAIL SAFE·SPD
●
The fail-safe (SPEED) circuit function is displayed.
TCS MONITOR
●
Indicates [ON/OFF] condition of TCS.
THRTL POS SEN
●
The voltage of throttle position sensor is displayed.
R/LORD ESTMT
●
The present road/load computed by ASCD control unit is displayed.
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