Infiniti QX4 (R50). Manual — part 355
ASCD ACTUATOR/PUMP CHECK
=NBEL0218S08
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-240).
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.
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-237
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.
SEL265WB
OK or NG
OK
©
INSPECTION END
NG
©
Replace ASCD pump.
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
Trouble Diagnoses (Cont’d)
EL-238
SEL302X
Electrical Component Inspection
=NBEL0219
ASCD BRAKE SWITCH AND STOP LAMP SWITCH
NBEL0219S02
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-14,
“BRAKE PEDAL AND BRACKET”.
SEL303X
PARK/NEUTRAL POSITION SWITCH
NBEL0219S03
A/T selector lever position
Continuity
Between terminals 1 and 2
“P”
Yes
“N”
Yes
Except “P” and “N”
No
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
IDX
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
Electrical Component Inspection
EL-239
ASCD Wire Adjustment
=NBEL0220
MEL383K
CAUTION:
I
Be careful not to twist ASCD wire when removing it.
I
Do not tense ASCD wire excessively during adjustment.
Adjust the tension of ASCD wire in the following manner.
1.
Loosen lock nut and adjusting nut.
2.
Make sure that accelerator wire is properly adjusted. Refer to
FE-3, “ACCELERATOR CONTROL SYSTEM”.
3.
Tighten adjusting nut just until throttle drum starts to move.
4.
Loosen adjusting nut again 1/2 to 1 turn.
5.
Tighten lock nut.
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
ASCD Wire Adjustment
EL-240
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