2001 INFINITI QX4 run flat

SYMPTOM
Reference
section
HARD/NO START/RESTART (EXCP. HA)
ENGINE STALL
HESITATION/SURGING/FLAT SPOT
SPARK KNOCK/DETONATION
LACK OF POWER/POOR ACCELERATION
HIGH IDLE/LOW IDLE
ROUGH IDLE/HUNTING
IDLING VIBRATION
SLOW/NO RETURN TO IDLE
OVERHEATS/WATER TEMPERATURE HIGH
EXCESSIVE FUEL CONSUMPTION
EXCESSIVE OIL CONSUMPTION
BATTERY DEAD (UNDER CHARGE)
Warranty symptom code AA AB AC AD AE AF AG AH AJ AK AL AM HA
IVIS (INFINITI Vehicle Immobilizer System Ð
NATS)11EC-74 or EL
section
1 - 6: The numbers refer to the order of inspection.
CONSULT-II Reference Value in Data Monitor
Mode
NBEC0042Remarks:
ISpecification data are reference values.
ISpecification data are output/input values which are detected or supplied by the ECM at the connector.
* Specification data may not be directly related to their components signals/values/operations.
i.e. Adjust ignition timing with a timing light before monitoring IGN TIMING, because the monitor may show the specification data in
spite of the ignition timing not being adjusted to the specification data. This IGN TIMING monitors the data calculated by the ECM
according to the signals input from the camshaft position sensor and other ignition timing related sensors.
IIf the real-time diagnosis results are NG and the on board diagnostic system results are OK when diagnosing the mass air flow sensor,
first check to see if the fuel pump control circuit is normal.
MONITOR ITEM CONDITION SPECIFICATION
ENG SPEED
CKPS´RPM (POS)ITachometer: Connect
IRun engine and compare tachometer indication with the CONSULT-II
value.Almost the same speed as
the CONSULT-II value.
POS COUNTIEngine: Running 179 - 181
MAS A/F SE-B1IEngine: After warming up
IAir conditioner switch: ªOFFº
IShift lever: ªNº
INo-loadIdle 1.2 - 1.8V
2,500 rpm 1.6 - 2.2V
COOLAN TEMP/SIEngine: After warming up More than 70ÉC (158ÉF)
HO2S1 (B1)
HO2S1 (B2)
IEngine: After warming upMaintaining engine speed at 2,000
rpm0 - 0.3V+,Approx. 0.6 -
1.0V
HO2S1 MNTR (B1)
HO2S1 MNTR (B2)LEAN+,RICH
Changes more than 5 times
during 10 seconds.
HO2S2 (B1)
HO2S2 (B2)
IEngine: After warming upMaintaining engine speed at 2,000
rpm0 - 0.3V+,Approx. 0.6 -
1.0V
HO2S2 MNTR (B1)
HO2S2 MNTR (B2)LEAN+,RICH
TROUBLE DIAGNOSIS Ð GENERAL DESCRIPTION
Symptom Matrix Chart (Cont'd)
EC-122

SEM861E
InspectionNBEM0019CYLINDER HEAD DISTORTIONNBEM0019S01Clean surface of cylinder head.
Use a reliable straightedge and feeler gauge to check the flatness
of cylinder head surface.
Check along six positions shown in the figure.
Head surface flatness: Limit 0.1 mm (0.004 in)
If beyond the specified limit, resurface or replace it.
The limit for cylinder head resurfacing is determined by the
cylinder block resurfacing.
Resurfacing limit:
Amount of cylinder head resurfacing is ªAº.
Amount of cylinder block resurfacing is ªBº.
The maximum limit : A+ B = 0.2 mm (0.008 in)
After resurfacing cylinder head, check that camshaft rotates freely
by hand. If resistance is felt, cylinder head must be replaced.
Nominal cylinder head height:
126.3 - 126.5 mm (4.972 - 4.980 in)
SEM191F
CAMSHAFT VISUAL CHECKNBEM0019S02Check camshaft for scratches, seizure and wear.
CAMSHAFT RUNOUTNBEM0019S031. Measure camshaft runout at A and B as shown in the figure.
Runout (Total indicator reading):
Limit 0.05 mm (0.0020 in)
2. If it exceeds the limit, replace camshaft.
SEM549A
CAMSHAFT CAM HEIGHTNBEM0019S041. Measure camshaft cam height.
Standard cam height:
Intake and exhaust
44.465 - 44.655 mm (1.7506 - 1.7581 in)
Cam wear limit:
0.2 mm (0.008 in)
2. If wear is beyond the limit, replace camshaft.
SEM862E
CAMSHAFT JOURNAL CLEARANCENBEM0019S051. Install camshaft bracket and tighten bolts to the specified
torque.
2. Measure inner diameter ªAº of camshaft bearing.
Standard inner diameter:
No. 1: 26.000 - 26.021 mm (1.0236 - 1.0244 in)
No. 2, 3, 4: 23.500 - 23.521 mm (0.9252 - 0.9260 in)
CYLINDER HEAD
Inspection
EM-42

SST601C
Checking Gear Housing MovementNBST00081. Check the movement of steering gear housing during station-
ary steering on a dry paved surface.
IApply a force of 49 N (5 kg, 11 lb) to steering wheel to check
the gear housing movement.
Turn off ignition key while checking.
Movement of gear housing:
±2mm(±0.08 in) or less
2. If movement exceeds the limit, replace mount insulator after
confirming proper installation of gear housing clamps.
SST602C
Adjusting Rack RetainerNBST0009IPerform this driving test on a flat road.
a) Check whether vehicle moves in a straight line when steering
wheel is released.
b) Check whether steering wheel returns to neutral position when
steering wheel is released from a slightly turned (approx. 20É)
position.
IIf any abnormality is found, correct it by resetting adjusting
screw.
Checking and Adjusting Drive BeltsNBST0010Refer to MA-13, ªChecking Drive Beltsº.
SST280BA
Checking Fluid LevelNBST0011Check fluid level.
Use the correct range of the dipstick depending on the fluid tem-
perature. Use the ªHOTº range at 50 to 80ÉC (122 to 176ÉF), or the
ªCOLDº range at 0 to 30ÉC (32 to 86ÉF).
CAUTION:
IDo not overfill.
IRecommended fluid is Genuine Nissan PSF II or equiva-
lent. Refer to MA-11, ªFluids and Lubricantsº.
SST458C
Checking Fluid LeakageNBST0012Check the lines for improper attachment and for leaks, cracks,
damage, loose connections, chafing and deterioration.
1. Run engine between idle speed and 1,000 rpm.
Make sure temperature of fluid in oil tank rises to 60 to 80ÉC
(140 to 176ÉF).
2. Turn steering wheel right-to-left several times.
3. Hold steering wheel at each ªlockº position for five seconds
and carefully check for fluid leakage.
ON-VEHICLE SERVICE
Checking Gear Housing Movement
ST-8

CAUTION:
Do not hold the steering wheel in a locked position for more
than 15 seconds.
4. If fluid leakage at connectors is noticed, loosen flare nut and
then retighten.
Do not overtighten connector as this can damage O-ring,
washer and connector.
5. Check rack boots for accumulation of power steering fluid.
Bleeding Hydraulic SystemNBST00131. Raise front end of vehicle until wheels are clear of the ground.
2. Add fluid into oil tank to specified level. Then, quickly turn
steering wheel fully to right and left and lightly touch steering
stoppers.
Repeat steering wheel operation until fluid level no longer
decreases.
3. Start engine.
Repeat step 2 above.
IIncomplete air bleeding will cause the following to occur. When
this happens, bleed air again.
a) Air bubbles in reservoir tank
b) Clicking noise in oil pump
c) Excessive buzzing in oil pump
Fluid noise may occur in the valve or oil pump. This is common
when the vehicle is stationary or while turning steering wheel
slowly. This does not affect performance or durability of the system.
SST491B
SST090B
Checking Steering Wheel Turning ForceNBST00141. Park vehicle on a level, dry surface and set parking brake.
2. Start engine.
3. Bring power steering fluid up to adequate operating tempera-
ture. [Make sure temperature of fluid is approximately 60 to
80ÉC (140 to 176ÉF).]
Tires need to be inflated to normal pressure.
4. Check steering wheel turning force when steering wheel has
been turned 360É from the neutral position.
Steering wheel turning force:
39 N (4 kg, 9 lb) or less
5. If steering wheel turning force is out of specification, check
rack sliding force.
a. Disconnect steering column lower joint and knuckle arms from
the gear.
b. Start and run engine at idle to make sure steering fluid has
reached normal operating temperature.
c. Pull tie-rod slowly to move it from neutral position to±11.5 mm
(±0.453 in) at speed of 3.5 mm (0.138 in)/s. Check that rack
sliding force is within specification.
Rack sliding force:
137 - 255 N (14 - 26 kg, 31 - 57 lb)
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
RS
BT
HA
SC
EL
IDX
ON-VEHICLE SERVICE
Checking Fluid Leakage (Cont'd)
ST-9

SFA975B
FRONT WHEEL ALIGNMENTNBSU0006Before checking front wheel alignment, be sure to make a prelimi-
nary inspection (Unladen*).
*: Fuel, radiator coolant and engine oil full. Spare tire, jack, hand
tools and mats in designated positions.
Preliminary InspectionNBSU0006S011. Check tires for wear and improper inflation.
2. Check wheels for deformation, cracks and other damage.
If deformed, remove wheel and check wheel runout.
NOTE:
Measure both the inner and outer sides for the radial runout and
lateral runout, and confirm the figures are within the standards.
Wheel runout (Dial indicator value):
Refer to SDS.
3. Check front wheel bearings for looseness.
4. Check front suspension for looseness.
5. Check steering linkage for looseness.
6. Check that front shock absorbers work properly.
7. Check vehicle posture (Unladen).
SFA894
Camber, Caster and Kingpin InclinationNBSU0006S02Camber, caster and kingpin inclination are preset at factory
and cannot be adjusted.
1. Measure camber, caster and kingpin inclination of both right
and left wheels with a suitable alignment gauge.
Camber, Caster and Kingpin inclination:
Refer to SDS, SU-13.
2. If camber, caster or kingpin inclination is not within
specification, inspect front suspension parts. Replace dam-
aged or worn out parts.
FRONT SUSPENSION
On-vehicle Service (Cont'd)
SU-6