Infiniti Q45 (FY33). Manual — part 322
SEL515W
DIAGNOSTIC PROCEDURE 4
(ASCD STEERING SWITCH CHECK)
SEL760UA
SEL365V
CHECK ASCD STEERING SWITCH
INPUT.
See “SET SW”, “RESUME/ACC
SW” and “CANCEL SW” in “Data
monitor” mode.
SET SW, RESUME/ACC SW and
CANCEL SW
When switch is pressed: ON
When switch is released: OFF
-------------------------------------------------------------------------------------------------------------------------------------- OR --------------------------------------------------------------------------------------------------------------------------------------
1. Disconnect ASCD control unit
connector.
2. Check voltage between control
unit terminals and ground.
Refer to wiring diagram in EL-267.
NG
E
OK
ASCD steering switch is
OK.
CHECK POWER SUPPLY FOR ASCD
STEERING SWITCH.
Does horn work?
OK
E
NG
Check the following.
I
15A fuse (No.
64
,
located in the fuse, fus-
ible link and relay box)
I
Horn relay
I
Harness for open or
short between horn relay
and fuse
CHECK ASCD STEERING SWITCH.
Check continuity between terminals by
pushing each switch.
OK
E
NG
Replace ASCD steering
switch.
Check the following.
I
Harness for open or short between
ASCD steering switch and ASCD con-
trol unit
I
Harness for open or short between
ASCD steering switch and spiral cable
Terminal No.
Switch condition
!
@
Pressed Released
SET/
COAST
SW
q
2
Ground
12V
0V
RESUME/
ACC SW
q
1
Ground
12V
0V
CANCEL
SW
q
2
Ground
12V
0V
q
1
Ground
12V
0V
Switch
Terminal
q
1
q
3
q
2
SET/
COAST
q
q
RESUME/
ACCEL
q
q
CANCEL
q
E
q
q
E
q
GI
MA
EM
LC
EC
FE
AT
PD
FA
RA
BR
ST
RS
BT
HA
IDX
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
Trouble Diagnoses (Cont’d)
H
H
H
EL-279
SEL516W
DIAGNOSTIC PROCEDURE 5
(VEHICLE SPEED SIGNAL CHECK)
SEL761UA
CHECK VEHICLE SPEED SIGNAL.
See “VHCL SPEED SE” in
“Data monitor” mode while driv-
ing.
-------------------------------------------------------------------------------------------------------------------------- OR --------------------------------------------------------------------------------------------------------------------------
1. Apply wheel chocks and jack
up drive wheel.
2. Disconnect ASCD control
unit connector.
3. Connect voltmeter between
control unit connector termi-
nal
q
7
and ground.
4. Slowly turn drive wheel.
5. Check deflection of voltme-
ter pointer.
Refer to wiring diagram in
EL-270.
NG
E
OK
Vehicle speed sensor is OK.
CHECK SPEEDOMETER OPERA-
TION.
Does speedometer operate normally?
Yes
E
No
Check speedometer and
vehicle speed sensor circuit.
Refer to EL-149.
Check harness for open or short
between ASCD control unit terminal
q
7
and combination meter terminal
q
18
.
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
Trouble Diagnoses (Cont’d)
H
H
EL-280
MEL401GI
DIAGNOSTIC PROCEDURE 6
(ASCD PUMP CIRCUIT CHECK)
CHECK ASCD PUMP.
1. Disconnect ASCD pump connector.
2. Measure resistance between ASCD
pump terminals
q
1
and
q
2
,
q
3
,
q
4
.
Refer to wiring diagram in EL-269.
OK
E
NG
Replace ASCD pump.
Check harness for open or short between
ASCD pump and ASCD control unit.
If a self-diagnostic result has
already been accomplished,
check using the following table.
Terminals
Resistance
Ω
q
1
q
4
Approx. 3
q
2
Approx. 65
q
3
Approx. 65
CONSULT-II
self-diagnostic
result
Check circuit
ASCD control
unit terminal
ASCD pump
terminal
POWER SUP-
PLY-VALVE
q
8
q
1
VACUUM
PUMP
q
9
q
4
AIR VALVE
q
10
q
2
RELEASE
VALVE
q
14
q
3
GI
MA
EM
LC
EC
FE
AT
PD
FA
RA
BR
ST
RS
BT
HA
IDX
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
Trouble Diagnoses (Cont’d)
H
EL-281
MEL402G
DIAGNOSTIC PROCEDURE 7
(ASCD ACTUATOR/PUMP CHECK)
MEL403G
MEL404GF
CHECK VACUUM HOSE.
Check vacuum hose (between ASCD
actuator and ASCD pump) for breakage,
cracks or fracture.
OK
E
NG
Repair or replace hose.
CHECK ASCD WIRE.
Check wire for improper installation, rust
formation or breaks.
OK
E
NG
Repair or replace wire.
Refer to “ASCD Wire
Adjustment” (EL-284).
CHECK ASCD ACTUATOR.
1. Disconnect vacuum hose from ASCD
actuator.
2. Apply −40 kPa (−0.41 kg/cm
2
, −5.8 psi)
vacuum to ASCD actuator with hand
vacuum pump.
ASCD wire should move to pull throttle
drum.
3. Wait 10 seconds and check for
decrease in vacuum pressure.
Vacuum pressure decrease:
Less than 2.7 kPa (0.028 kg/cm
2
, 0.39
psi)
OK
E
NG
Replace ASCD actuator.
CHECK ASCD PUMP.
1. Disconnect vacuum hose from ASCD
pump and ASCD pump connector.
2. If necessary remove ASCD pump.
3. Connect vacuum gauge to ASCD
pump.
4. Apply 12V direct current to ASCD
pump and check operation.
A vacuum pressure of at least −35 kPa
(−0.36 kg/cm
2
, −5.1 psi) should be gen-
erated.
OK
E
NG
Replace ASCD pump.
ASCD actuator/pump is OK.
12V direct current sup-
ply terminals
Operation
!
@
Air valve
q
1
q
2
Close
Release
valve
q
3
Close
Vacuum
motor
q
4
Operate
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
Trouble Diagnoses (Cont’d)
H
H
H
H
EL-282
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