2001 INFINITI QX4 Factory Service Manual

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Page 1417 of 2395

INFINITI QX4 2001 Factory Service Manual POWER SUPPLY AND GROUND CIRCUIT CHECK=NBEL0218S03
1 CHECK POWER SUPPLY CIRCUIT FOR ASCD CONTROL UNIT
1. Disconnect ASCD control unit harness connector.
2. Turn ignition switch ON.
3. Check voltage bet

Page 1418 of 2395

INFINITI QX4 2001 Factory Service Manual 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 uni

Page 1419 of 2395

INFINITI QX4 2001 Factory Service Manual 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 wiri

Page 1420 of 2395

INFINITI QX4 2001 Factory Service Manual VEHICLE SPEED SENSOR CHECK=NBEL0218S06
1 CHECK SPEEDOMETER OPERATION
Does speedometer operate normally?
Ye s©GO TO 2.
No©Check speedometer and vehicle speed sensor circuit. Refer to wiring diagram i

Page 1421 of 2395

INFINITI QX4 2001 Factory Service Manual 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 harne

Page 1422 of 2395

$INFINITI QX4 2001 Factory Service Manual ASCD ACTUATOR/PUMP CHECK=NBEL0218S08 1 CHECK VACUUM HOSE Check vacuum hose (between ASCD actuator and ASCD pump) for breakage, cracks or fracture. MEL402G OK or NG OK©GO TO 2. NG©Repair or replace h$

Page 1423 of 2395

INFINITI QX4 2001 Factory Service Manual 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

Page 1424 of 2395

INFINITI QX4 2001 Factory Service Manual SEL302X
Electrical Component Inspection=NBEL0219ASCD BRAKE SWITCH AND STOP LAMP SWITCHNBEL0219S02
ConditionContinuity
ASCD brake
switchStop lamp switch
When brake pedal is depressed No Yes
When brake

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