Infiniti M45 (Y34). Manual — part 7
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
ACS-21
[ASCD]
C
D
E
F
G
H
I
J
L
M
A
B
ACS
2.
CHECK STOP LAMP SWITCH CIRCUIT
With CONSULT-II
See “STOP LAMP” in “DATA MONITOR” mode.
Without CONSULT-II
1.
Disconnect ASCD control unit connector.
2.
Check voltage between ASCD control unit harness connector
M35 terminal 23 (R/W) and ground.
Refer to wiring diagram in
OK or NG
OK
>> ASCD brake/stop lamp switch is OK.
NG
>> Check the following.
●
15A fuse [No. 17, located in the fuse block (J/B) NO.1]
●
Harness for open or short between ASCD control unit and stop lamp switch
●
Harness for open or short between fuse and stop lamp switch
●
Stop lamp switch
Refer to
ACS-30, "Electrical Component Inspection"
When brake pedal is released
: STOP LAMP SW OFF
When brake pedal is depressed
: STOP LAMP SW ON
PBIC0207E
When brake pedal is released
: 0V
When brake pedal is depressed
: Approx. 12 V
PBIC0208E
ACS-22
[ASCD]
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
ASCD STEERING SWITCH CHECK
1.
CHECK ASCD STEERING SWITCH CIRCUIT FOR ASCD CONTROL UNIT
With CONSULT-II
See “MAIN SW”, “RESUME/ACC SW”, “SET SW” and “CANCEL
SW” in “DATA MONITOR” mode.
Without CONSULT-II
1.
Turn ignition switch ON.
2.
Check voltage between ASCD control unit harness connector
M35 terminal 11 (G/OR) and 24 (G).
Refer to wiring diagram in
OK or NG
OK
>> ASCD steering switch is OK.
NG
>> GO TO 2.
MAIN SW, RESUME/ACC SW,
SET SW and CANCEL SW
When switch is depressed:
ON
When switch is released:
OFF
PBIC0209E
Switch
Condition
Voltage [V]
MAIN (CRUISE) SW
Depressed
0
Released
Approx. 4.0
SET/COAST SW
Depressed
Approx. 2.0
Released
Approx. 4.0
RESUME/ACCEL SW
Depressed
Approx. 3.0
Released
Approx. 4.0
CANCEL SW
Depressed
Approx. 1.0
Released
Approx. 4.0
PKIA2588E
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
ACS-23
[ASCD]
C
D
E
F
G
H
I
J
L
M
A
B
ACS
2.
CHECK ASCD STEERING SWITCH
1.
Disconnect ASCD steering switch.
2.
Check resistance between ASCD steering switch terminals 1
and 2 by depressing each switch.
OK or NG
OK
>> Check harness for open or short between ASCD steering switch and ASCD control unit.
NG
>> Replace ASCD steering switch.
Switch
Condition
Resistance [
Ω
]
MAIN (CRUISE) SW
Depressed
Approx. 0.3
Released
Approx. 4,000
SET/COAST SW
Depressed
Approx. 661
Released
Approx. 4,000
RESUME/ACCEL SW
Depressed
Approx. 1,486
Released
Approx. 4,000
CANCEL SW
Depressed
Approx. 249
Released
Approx. 4,000
SKIA3061E
ACS-24
[ASCD]
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
VEHICLE SPEED SENSOR CHECK
1.
CHECK SPEEDOMETER OPERATION
Does speedometer operate normally?
Yes
>> GO TO 2.
No
>> Check speedometer and vehicle speed sensor circuit. Refer to
and
2.
CHECK VEHICLE SPEED INPUT
With CONSULT-II
See “VHCL SPEED SE” in “DATA MONITOR” mode while driving.
NOTE:
●
This test may be conducted with the drive wheels lifted in the shop or by driving the vehicle. If a road test
is expected to be easier, it is unnecessary to lift the vehicle.
●
Always drive vehicle in safe speed and manner according to traffic conditions and obey all traffic laws.
Without CONSULT-II
1.
Apply wheel chocks and jack up drive wheels.
2.
Disconnect ASCD control unit connector.
3.
Turn ignition switch ON.
4.
Check voltage between ASCD control unit harness connector
M35 terminal 22 (PU/W) and ground with turning drive wheels
slowly by hand.
Refer to wiring diagram in
Yes or No
Yes
>> Vehicle speed sensor is OK.
No
>> Check harness for open or short between ASCD control unit and combination meter.
Is actual vehicle speed indicated?
PBIC0212E
Dose voltage pointer deflect?
PBIC0213E
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