Infiniti G20 (P11). Manual — part 345
POWER SUPPLY AND GROUND CIRCUIT CHECK
=NCEL0099S03
1
CHECK POWER SUPPLY CIRCUIT FOR ASCD CONTROL UNIT
1. Disconnect ASCD control unit harness connector.
2. Turn ignition switch ON.
3. Check voltage between ASCD control unit harness connector terminal 5 and ground.
SEL256WA
Refer to wiring diagram in EL-150.
Yes
©
GO TO 2.
No
©
Check the following.
I
10A fuse (No. 8 located in the fuse block)
I
Harness for open or short
2
CHECK GROUND CIRCUIT FOR ASCD CONTROL UNIT
Check continuity between ASCD control unit harness connector terminal 17 and body ground.
SEL257WA
Refer to wiring diagram in EL-151.
Yes
©
Power supply and ground circuit is OK.
No
©
Repair harness.
GI
MA
EM
LC
EC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
HA
SC
IDX
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
Trouble Diagnoses (Cont’d)
EL-157
ASCD BRAKE/STOP LAMP SWITCH CHECK
=NCEL0099S06
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.
SEL258WB
OK or NG
OK
©
GO TO 2.
NG
©
Check the following.
I
ASCD brake switch
Refer to “Electrical Component Inspection” (EL-164).
I
Park/neutral position switch
Refer to “Electrical Component Inspection” (EL-164).
I
Park/neutral position relay
I
ASCD clutch switch
Refer to “Electrical Component Inspection” (EL-164).
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.
SEL259WA
Refer to wiring diagram in EL-152.
OK or NG
OK
©
ASCD brake/stop lamp switch is OK.
NG
©
Check the following.
I
15A 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-164).
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
Trouble Diagnoses (Cont’d)
EL-158
ASCD STEERING SWITCH CHECK
=NCEL0099S07
1
CHECK ASCD STEERING SWITCH CIRCUIT FOR ASCD CONTROL UNIT
Check voltage between ASCD control unit harness connector terminals and ground.
SEL260WA
Refer to wiring diagram in EL-151 and EL-152.
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
10A fuse (No. 36, located in the relay box)
I
Horn relay
I
Harness for open or short
3
CHECK ASCD STEERING SWITCH
1. Disconnect ASCD steering switch.
2. Check continuity between terminals by pushing each switch.
SEL178X
OK or NG
OK
©
Check the following.
I
Harness for open or short between ASCD steering switch and ASCD control unit
I
Main switch ground circuit
NG
©
Replace ASCD steering switch.
GI
MA
EM
LC
EC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
HA
SC
IDX
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
Trouble Diagnoses (Cont’d)
EL-159
VEHICLE SPEED SENSOR CHECK
=NCEL0099S08
1
CHECK SPEEDOMETER OPERATION
Does speedometer operate normally?
Yes
©
GO TO 2.
No
©
Check speedometer and vehicle speed sensor circuit. Refer to EL-93.
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.
SEL263WA
Refer to wiring diagram in EL-153.
Yes
©
Vehicle speed sensor is OK.
No
©
Check harness for open or short between ASCD control unit terminal 22 and combination
meter terminal 32.
ASCD PUMP CIRCUIT CHECK
NCEL0099S09
1
CHECK ASCD PUMP
1. Disconnect ASCD pump connector.
2. Measure resistance between ASCD pump terminals 1 and 2, 3, 4.
SEL262WA
Refer to wiring diagram in EL-151.
OK or NG
OK
©
GO TO 2.
NG
©
Replace ASCD pump.
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
Trouble Diagnoses (Cont’d)
EL-160
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