Infiniti QX4 (R50). Manual — part 354
ASCD BRAKE/STOP LAMP SWITCH CHECK
=NBEL0218S04
1
CHECK ASCD BRAKE SWITCH CIRCUIT
1. Disconnect ASCD control unit harness connector.
2. Turn ignition switch ON.
3. Check voltage between ASCD control unit harness connector terminal 8 and ground.
SEL258WD
OK or NG
OK
©
GO TO 2.
NG
©
Check the following.
I
ASCD brake switch
Refer to “Electrical Component Inspection” (EL-239).
I
Park/neutral position switch
Refer to “Electrical Component Inspection” (EL-239).
I
Park/neutral position relay
I
Harness for open or short
2
CHECK STOP LAMP SWITCH CIRCUIT
1. Disconnect ASCD control unit harness connector.
2. Check voltage between ASCD control unit harness connector terminal 23 and ground.
SEL259WB
Refer to wiring diagram in EL-226.
OK or NG
OK
©
ASCD brake/stop lamp switch is OK.
NG
©
Check the following.
I
10A fuse [No. 14, located in the fuse block (J/B)]
I
Harness for open or short between ASCD control unit and stop lamp switch
I
Harness for open or short between fuse and stop lamp switch
I
Stop lamp switch
Refer to “Electrical Component Inspection” (EL-239).
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
IDX
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
Trouble Diagnoses (Cont’d)
EL-233
ASCD STEERING SWITCH CHECK
=NBEL0218S05
1
CHECK ASCD STEERING SWITCH CIRCUIT FOR ASCD CONTROL UNIT
Check voltage between ASCD control unit harness connector terminals and ground.
SEL260WC
Refer to wiring diagram in EL-226.
OK or NG
OK
©
ASCD steering switch is OK.
NG
©
GO TO 2.
2
CHECK POWER SUPPLY FOR ASCD STEERING SWITCH
Does horn work?
Yes
©
GO TO 3.
No
©
Check the following.
I
7.5A fuse (No. 52, located in the relay box)
I
Horn relay
I
Horn circuit
3
CHECK ASCD STEERING SWITCH
1. Disconnect ASCD steering switch.
2. Check continuity between terminals by pushing each switch.
SEL764WA
OK or NG
OK
©
Check harness for open or short between ASCD steering switch and ASCD control unit.
NG
©
Replace ASCD steering switch.
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
Trouble Diagnoses (Cont’d)
EL-234
VEHICLE SPEED SENSOR CHECK
=NBEL0218S06
1
CHECK SPEEDOMETER OPERATION
Does speedometer operate normally?
Yes
©
GO TO 2.
No
©
Check speedometer and vehicle speed sensor circuit. Refer to wiring diagram in EL-228.
2
CHECK VEHICLE SPEED INPUT
1. Apply wheel chocks and jack up drive wheel.
2. Disconnect ASCD control unit harness connector.
3. Check voltage between control unit terminal 22 and ground with turning drive wheel slowly by hand.
SEL263WB
Refer to wiring diagram in EL-227.
Yes
©
Vehicle speed sensor is OK.
No
©
Check harness for open or short between ASCD control unit terminal 22 and combination
meter terminal 13.
ASCD PUMP CIRCUIT CHECK
NBEL0218S07
1
CHECK ASCD PUMP
1. Disconnect ASCD pump connector.
2. Measure resistance between ASCD pump terminals 1 and 2, 3, 4.
SEL262WB
Refer to wiring diagram in EL-227.
OK or NG
OK
©
GO TO 2.
NG
©
Replace ASCD pump.
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
IDX
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
Trouble Diagnoses (Cont’d)
EL-235
2
CHECK ASCD PUMP CIRCUIT
1. Disconnect ASCD control unit harness connector.
2. Check harness for open or short between ASCD control unit and ASCD pump.
SEL269WB
OK or NG
OK
©
GO TO 3.
NG
©
Repair harness.
3
CHECK ASCD PUMP POWER SUPPLY
1. Jack-up the drive wheels.
2. Maintain the conditions below.
I
Vehicle speed is more than 40 km/h (25 MPH).
I
Main switch (CRUISE lamp) is ON.
I
Set/coast switch (SET lamp) is ON.
Check voltage between ASCD control unit harness connector terminal 12 and ground.
SEL381WB
OK or NG
OK
©
ASCD pump power supply is OK.
NG
©
Replace ASCD control unit.
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
Trouble Diagnoses (Cont’d)
EL-236
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