2001 INFINITI QX4 Factory Service Manual

Page 2337 of 2395

INFINITI QX4 2001  Factory Service Manual Symptom 3. 4WD Shift Indicator Lamp Does
Not Turn OFF
NBTF0031SYMPTOM: When 4WD shift switch is set from ª4Hº to
ª4LOº, all the 4WD shift indicator lamps do not turn OFF.
1 CHECK ATP SWITCH CIRCUI

Page 2338 of 2395

INFINITI QX4 2001  Factory Service Manual 2 CHECK FOLLOWING ITEMS
Check the following.
IATP warning lamp
IContinuity between PNP (ªPº position) switch terminal 4 and ATP warning lamp
IContinuity between ATP warning lamp and ATP switch
OK or

Page 2339 of 2395

INFINITI QX4 2001  Factory Service Manual Symptom 5. 4LO Indicator Lamp Does Not Turn
ON
=NBTF0033SYMPTOM: When 4WD shift switch is set from ª4Hº to
ª4LOº position, 4LO indicator lamp does not turn ON.
1 CHECK TRANSFER CONTROL UNIT POWER

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INFINITI QX4 2001  Factory Service Manual 2 CHECK TRANSFER CONTROL UNIT GROUND CIRCUIT
1. Turn ignition switch ªOFFº, and disconnect transfer control unit connector.
2. Check for continuity between transfer control unit body-side connector

Page 2341 of 2395

INFINITI QX4 2001  Factory Service Manual Symptom 6. 4WD Shift Indicator Lamp Does
Not Indicate ª4Hº
NBTF0034SYMPTOM: When 4WD shift switch is set to ª4Hº, 4WD shift
indicator lamp does not indicate ª4Hº.
1 CHECk 4WD WARNING LAMP
SMT958

Page 2342 of 2395

INFINITI QX4 2001  Factory Service Manual Symptom 7. 4WD Shift Indicator Lamp Repeats
Flickering
=NBTF0035SYMPTOM: 4WD shift indicator lamp keeps flickering.
1 CHECK 4WD SHIFT INDICATOR LAMP
SMT958D
1. Set 4WD shift switch to ª2WDº position

Page 2343 of 2395

INFINITI QX4 2001  Factory Service Manual Symptom 8. Tight Corner Braking SymptomNBTF0036SYMPTOM: Tight corner braking symptom occurs. (Hydraulic
system failure)
1 CHECK INPUT SIGNAL
With CONSULT-II
1. Select ªECU INPUT SIGNALSº in Data Mon

Page 2344 of 2395

INFINITI QX4 2001  Factory Service Manual Symptom 9. 4WD System Does Not Operate=NBTF0037SYMPTOM: The vehicle cannot be put into 4WD mode.
(Hydraulic system failure)
1 CHECK INPUT SIGNAL
With CONSULT-II
1. Select ªECU INPUT SIGNALSº in Data