Infiniti G20 (P11). Manual — part 346
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.
SEL269WA
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.
SEL381WA
OK or NG
OK
©
ASCD pump power supply is OK.
NG
©
Replace ASCD control unit.
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-161
ASCD ACTUATOR/PUMP CHECK
=NCEL0099S10
1
CHECK VACUUM HOSE
Check vacuum hose (between ASCD actuator and ASCD pump) for breakage, cracks or fracture.
MEL402G
OK or NG
OK
©
GO TO 2.
NG
©
Repair or replace hose.
2
CHECK ASCD WIRE
Check wire for improper installation, rust formation or breaks.
OK or NG
OK
©
GO TO 3.
NG
©
Repair or replace wire. Refer to “ASCD Wire Adjustment” (EL-165).
3
CHECK ASCD ACTUATOR
1. Disconnect vacuum hose from ASCD actuator.
2. Connect the hose of hand vacuum pump to ASCD actuator.
SEL264W
OK or NG
OK
©
GO TO 4.
NG
©
Replace ASCD actuator.
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
Trouble Diagnoses (Cont’d)
EL-162
4
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.
SEL265W
OK or NG
OK
©
INSPECTION END
NG
©
Replace ASCD pump.
THROTTLE POSITION SENSOR SIGNAL CHECK
NCEL0099S11
1
CHECK THROTTLE POSITION SENSOR SIGNAL CIRCUIT
1. Disconnect ECM harness connector and ASCD control unit harness connector.
2. Check continuity between ECM terminal 71 and ASCD control unit terminal 3.
SEL268WA
OK or NG
OK
©
Refer to “TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT” in EC section. (EC-
146)
NG
©
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-163
CEL981-A
Electrical Component Inspection
=NCEL0100
ASCD BRAKE SWITCH AND STOP LAMP SWITCH
NCEL0100S02
Condition
Continuity
ASCD brake
switch
Stop lamp switch
When brake pedal is depressed
No
Yes
When brake pedal is released
Yes
No
Check each switch after adjusting brake pedal — refer to BR-12,
“BRAKE PEDAL AND BRACKET”.
SEL707PG
ASCD CLUTCH SWITCH (FOR M/T MODELS)
NCEL0100S04
Condition
Continuity
When clutch pedal is depressed
No
When clutch pedal is released
Yes
CEL982
PARK/NEUTRAL POSITION SWITCH (FOR A/T
MODELS)
NCEL0100S03
A/T selector lever position
Continuity
Between terminals 1 and 2
“P”
Yes
“N”
Yes
Except “P” and “N”
No
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
Electrical Component Inspection
EL-164
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