2001 INFINITI QX4 ignition

Component Parts and Harness Connector
Location
NBEL0041
SEL351X
System DescriptionNBEL0042UNIFIED CONTROL METERNBEL0042S06ISpeedometer, odo/trip meter, tachometer, fuel gauge and water temperature gauge are controlled totally
by control unit.
IDigital meter is adopted for odo/trip meter.*
*The record of the odo meter is kept even if the battery cable is disconnected. The record of the trip meter
is erased when the battery cable is disconnected.
IOdo/trip meter is indicated for about 30 seconds after ignition switch has been turned OFF.
IOdo/trip meter segment can be checked in diagnosis mode.
IMeter/gauge can be checked in diagnosis mode.
HOW TO CHANGE THE DISPLAY FOR ODO/TRIP METERNBEL0042S07
SEL175W
NOTE:
Turn ignition switch to the ªONº position to operate odo/trip meter.
METERS AND GAUGES
Component Parts and Harness Connector Location
EL-94

POWER SUPPLY AND GROUND CIRCUITNBEL0042S08Power is supplied at all times
Ithrough 7.5A fuse [No. 24, located in the fuse block (J/B)]
Ito combination meter terminal 62.
With the ignition switch in the ON or START position, power is supplied
Ithrough 10A fuse [No. 8, located in the fuse block (J/B)]
Ito combination meter terminal 66.
Ground is supplied
Ito combination meter terminal 59
Ithrough body grounds M4, M66 and M147.
WATER TEMPERATURE GAUGENBEL0042S01The water temperature gauge indicates the engine coolant temperature. The reading on the gauge is based
on the resistance of the thermal transmitter.
As the temperature of the coolant increases, the resistance of the thermal transmitter decreases. A variable
ground is supplied to terminal 18 of the combination meter for the water temperature gauge. The needle on
the gauge moves from ªCº to ªHº.
TACHOMETERNBEL0042S02The tachometer indicates engine speed in revolutions per minute (rpm).
The tachometer is regulated by a signal
Ifrom terminal 25 of the ECM
Ito combination meter terminal 16 for the tachometer.
FUEL GAUGENBEL0042S03The fuel gauge indicates the approximate fuel level in the fuel tank.
The fuel gauge is regulated by a variable ground signal supplied
Ito combination meter terminal 17 for the fuel gauge
Ifrom terminal 3 of the fuel level sensor unit
Ithrough terminal 2 of the fuel level sensor unit and
Ithrough body grounds B11, B22 and D210.
SPEEDOMETERNBEL0042S04The vehicle speed sensor provides a voltage signal to the combination meter for the speedometer.
The voltage is supplied
Ifrom combination meter terminal 15 for the speedometer
Ito terminal 2 of the vehicle speed sensor.
The speedometer converts the voltage into the vehicle speed displayed.
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METERS AND GAUGES
System Description (Cont'd)
EL-95

Meter/Gauge Operation and Odo/Trip Meter
Segment Check in Diagnosis Mode
NBEL0200DIAGNOSIS FUNCTIONNBEL0200S01IOdo/trip meter segment can be checked in diagnosis mode.
IMeters/gauges can be checked in diagnosis mode.
HOW TO ALTERNATE DIAGNOSIS MODENBEL0200S021. Turn ignition switch to ON and change odo/trip meter to ªTRIP
Aº or ªTRIP Bº.
2. Turn ignition switch to OFF.
3. Turn ignition switch to ON when pushing odo/trip meter switch.
4. Push odo/trip meter switch 1 second.
5. Release odo/trip meter switch.
6. Push odo/trip meter switch more than three times within 7
seconds.
SEL176W
7. All odo/trip meter segments should be turned on.
NOTE:
If some segments are not turned on, unified meter control unit with
odo/trip meter should be replaced.
At this point, the unified control meter is turned to diagnosis
mode.
SEL177W
8. Push odo/trip meter switch. Indication of each meter/gauge
should be as shown left during pushing odo/trip meter switch
if it is no malfunctioning.
NOTE:
It takes about a few seconds for indication of fuel gauge and water
temperature gauge to become stable.
METERS AND GAUGES
Meter/Gauge Operation and Odo/Trip Meter Segment Check in Diagnosis Mode
EL-100

SEL179WB
POWER SUPPLY AND GROUND CIRCUIT CHECK=NBEL0201S03Power Supply Circuit CheckNBEL0201S0301
Terminals Ignition switch position
(+) (þ) OFF ACC ON
62 GroundBattery
voltageBattery
voltageBattery
voltage
66 Ground 0V 0VBattery
voltage
If NG, check the following.
I10A fuse [No. 12, located in fuse block (J/B)]
I10A fuse [No. 30, located in fuse block (J/B)]
IHarness for open or short between fuse and combination
meter
SEL180WA
Ground Circuit CheckNBEL0201S0302
Terminals Continuity
59 - Ground Yes
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METERS AND GAUGES
Trouble Diagnoses (Cont'd)
EL-103

System DescriptionNBEL0153
SEL713U
This unit displays following items:
IEarth magnetism and heading direction of vehicle.
IOutside air temperature.
ICaution for frozen road surfaces.
OUTSIDE TEMPERATURE DISPLAYNBEL0153S01Push the switch when the ignition key is in the ªACCº or ªONº position. The outside temperature will be dis-
played in ªÉFº.
ISelecting the indication range
Push the switch to change from ªÉFº to ªÉCº.
IWhen the outside temperature drops below freezing point, ICE is displayed on the unit.
IWhen the outside temperature is between 55ÉC (130ÉF) and 70ÉC (158ÉF), the display shows 55ÉC
(130ÉF).
IWhen the outside temperature is lower than þ30ÉC (þ20ÉF) or higher than 70ÉC (158ÉF), the display shows
only ª---º though it is operating. This is not a problem.
IThe indicated temperature on the thermometer is not readily affected by engine heat. It changes only when
one of the following conditions is present.
a) The temperature detected by the ambient air temperature sensor is lower than the indicated temperature
on the thermometer.
b) The difference in temperature detected during a period of 40 seconds is less than 1ÉC (1.8ÉF) when vehicle
speed has been greater than 24 km/h (15 MPH) for more than 100 seconds.
(This is to prevent the indicated temperature from being affected by engine heat or cooling fan operation
during low-speed driving.)
c) The ignition key has been turned to the ªOFFº position for more than 4 hours. (The engine is cold.)
DIRECTION DISPLAYNBEL0153S02Push the switch when the ignition key is in the ªACCº or ªONº position. The direction will be displayed.
COMPASS AND THERMOMETER
System Description
EL-110

Trouble DiagnosesNBEL0048PRELIMINARY CHECK FOR THERMOMETERNBEL0048S02
1 COOL DOWN CHECK
1. Turn the ignition key switch to the ªACCº position.
2. Cool down the ambient air temperature sensor with water or ice, so that the indicated temperature falls.
Does the indicated temperature fall?
Ye s©GO TO 2.
No©The system is malfunctioning. Check the system following ªINSPECTION/COMPASS
AND THERMOMETERº.
2 WARM UP CHECK
1. Leave the vehicle for 10 minutes, so that the indicated temperature rises.
2. With the ignition key in the ªACCº position, disconnect and reconnect the ambient air temperature sensor connector.
Does the indicated temperature rise?
Ye s©The system is OK.
No©The system is malfunctioning. Check the system following ªINSPECTION/COMPASS
AND THERMOMETERº.
NOTE:
IWhen the outside temperature is between 55ÉC (130ÉF) and 70ÉC (158ÉF), the display shows 55ÉC
(130ÉF). When the outside temperature is lower than þ30ÉC (þ20ÉF) or higher than 70ÉC (158ÉF), the dis-
play shows only ª---º.
IThe indicated temperature on the thermometer is not readily affected by engine heat. It changes only when
one of the following conditions is present.
a) The temperature detected by the ambient air temperature sensor is lower than the indicated temperature
on the thermometer.
b) The difference in temperature detected during a period of 40 seconds is less than 1ÉC (1.8ÉF) when vehicle
speed has been greater than 24 km/h (15 MPH) for more than 100 seconds.
(This is to prevent the indicated temperature from being affected by engine heat or cooling fan operation
during low-speed driving.)
c) The ignition key has been turned to the ªOFFº position for more than 4 hours. (The engine is cold.)
INSPECTION/COMPASS AND THERMOMETERNBEL0048S01
Symptom Possible causes Repair order
No display at all 1. 10A fuse
2. Ground circuit
3. Compass and thermometer1. Check 10A fuse [No. 9, located in fuse block (J/B)].
Turn the ignition switch ON and verify that battery positive
voltage is at terminal 7 of compass and thermometer.
2. Check ground circuit for compass and thermometer.
3. Replace compass and thermometer.
Forward direction indi-
cation slips off the
mark or incorrect.1. In manual correction mode (Bar
and display vanish.)
2. Zone variation change is not done.1. Drive the vehicle and turn at an angle of 90É.
2. Perform the zone variation change.
Compass reading
remains unchanged.1. Vehicle speed sensor is not
entered.
2. Compass and thermometer1. Check harness for open or short between combination meter
terminal 13 and compass and thermometer terminal 1.
2. Replace compass and thermometer.
Displays wrong tem-
perature when ambient
temperature is between
þ30ÉC (þ20ÉF) and
55ÉC (130ÉF). (See
NOTE above.)1. Check operation
2. Ambient air temperature sensor
circuit
3. Vehicle speed sensor is not
entered.
4. Ambient air temperature sensor
5. Compass and thermometer1. Perform preliminary check shown above.
2. Check harness for open or short between ambient air tem-
perature sensor and compass and thermometer.
3. Check harness for open or short between combination meter
terminal 13 and compass and thermometer terminal 1.
4. Replace ambient air temperature sensor.
5. Replace compass and thermometer.
COMPASS AND THERMOMETER
Trouble Diagnoses
EL-112

SEL062WA
Fuel Warning Lamp Sensor CheckNBEL01661. Turn ignition switch ªOFFº.
2. Disconnect fuel level sensor unit harness connector B12.
3. Connect a resistor (80W) between fuel tank gauge unit harness
connector terminals 2 and 3.
4. Turn ignition switch ªONº.
The fuel warning lamp should come on.
NOTE:
ECM might store the 1st trip DTC P0180 during this inspection.
If the DTC is stored in ECM memory, erase the DTC after recon-
necting fuel tank gauge unit harness connector.
Refer to EC-60, ªHOW TO ERASE EMISSION-RELATED DIAG-
NOSTIC INFORMATIONº.
MEL425F
Electrical Components InspectionNBEL0051OIL PRESSURE SWITCH CHECKNBEL0051S02
Oil pressure
kPa (kg/cm2, psi)Continuity
Engine startMore than 10 - 20
(0.1-0.2,1-3)NO
Engine stopLess than 10 - 20
(0.1-0.2,1-3)YES
Check the continuity between the terminals of oil pressure switch
and body ground.
SEL901F
DIODE CHECKNBEL0051S03ICheck continuity using an ohmmeter.
IDiode is functioning properly if test results are as shown in the
figure at left.
ICheck diodes at the combination meter harness connector
instead of checking them on the combination meter assembly.
Refer to EL-115, ªWARNING LAMPº wiring diagrams.
NOTE:
Specification may vary depending on the type of tester. Before
performing this inspection, be sure to refer to the instruction
manual for the tester to be used.
WARNING LAMPS
Fuel Warning Lamp Sensor Check
EL-122

Component Parts and Harness Connector
Location
NBEL0052
SEL046W
System DescriptionNBEL0053The warning chime is controlled by the smart entrance control unit.
The warning chime is located in the smart entrance control unit.
Power is supplied at all times
Ithrough 7.5A fuse [No. 24, located in the fuse block (J/B)]
Ito smart entrance control unit terminal 10, and
Ito key switch terminal 2, and
Ithrough 10A fuse [No. 61, located in the fuse block (J/B)]
Ito tail lamp relay terminals 2 and 3.
With the ignition switch in the ON or START position, power is supplied
Ithrough 7.5A fuse [No. 11, located in the fuse block (J/B)]
Ito smart entrance control unit terminal 33.
Ground is supplied to smart entrance control unit terminal 16 through body grounds M77 and M111.
IGNITION KEY WARNING CHIMENBEL0053S01With the key in the ignition switch in the OFF or ACC position, and the driver's door open, the warning chime
will sound. Power is supplied
Ifrom key switch terminal 1
Ito smart entrance control unit terminal 32.
Ground is supplied
Ifrom front door switch LH terminal 1
Ito smart entrance control unit terminal 29.
Front door switch LH terminal 2 is grounded through body grounds B11, B22 and D210.
LIGHT WARNING CHIMENBEL0053S02With ignition switch OFF or ACC, driver's door open, warning chime will sound. [Except when headlamp bat-
tery saver control operates (for 45 seconds after ignition switch is turned to OFF or ACC position) and head-
lamps do not illuminate.] Power is supplied.
Ifrom tail lamp relay terminal 5
Ito smart entrance control unit terminal 34.
Ground is supplied
Ifrom front door switch LH terminal 1
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WARNING CHIME
Component Parts and Harness Connector Location
EL-125