fuel INFINITI QX4 2001 Factory Service Manual

3 DETECT MALFUNCTIONING PART
Check the following.
IFuse block (J/B) connector M10
I15A fuse in fuse block (J/B)
IHarness connectors M1, E1
IHarness for open or short between fuse and fuel pump relay-1 and fuel pump relay-2
©Repair harness or connectors.
4 CHECK FUEL PUMP RELAY-1 POWER SUPPLY CIRCUIT-II
Check voltage between terminal 3 and ground with CONSULT-II or tester.
SEF348Z
OK or NG
OK©GO TO 8.
NG©GO TO 5.
5 CHECK FUEL PUMP RELAY-2 OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect fuel pump relay-2.
2. Check harness continuity between fuel pump relay-2 terminal 5 and fuel pump relay-1 terminal 3. Refer to Wiring Dia-
gram.
Continuity should exist.
3. Also check harness for short to ground and short to power.
OK or NG
OK©GO TO 6.
NG©Repair open circuit or short to ground or short to power in harness or connectors.
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FUEL PUMP
Diagnostic Procedure (Cont'd)
EC-629

6 CHECK FUEL PUMP RELAY POWER SUPPLY CIRCUIT-III
1. Turn ignition switch ªOFFº.
2. Disconnect fuel pump relay-2.
3. Turn ignition switch ªONº.
4. Check voltage between terminals 2, 3 and ground with CONSULT-II or tester.
SEF026Z
OK or NG
OK©GO TO 8.
NG©GO TO 7.
7 DETECT MALFUNCTIONING PART
Check the following.
I15A fuse in fusible link and relay box
IHarness for open or short between fuse and fuel pump relay-2
©Repair harness or connectors.
8 CHECK FUEL PUMP RELAY-2 GROUND CIRCUIT FOR OPEN AND SHORT
1. Check harness continuity between fuel pump relay-2 terminal 1 and ground.
Continuity should exist.
2. Also check harness for short to power.
OK or NG
©Repair open circuit or short to power in harness or connector.
FUEL PUMP
Diagnostic Procedure (Cont'd)
EC-630

9 CHECK FUEL PUMP POWER SUPPLY AND GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch ªOFFº.
2. Disconnect fuel level sensor unit and fuel pump harness connector.
SEF021S
3. Check harness continuity between fuel pump terminal 2 and body ground, fuel pump terminal 1 and fuel pump relay-1
terminal 5. Refer to Wiring Diagram.
Continuity should exist.
4. Also check harness for short to ground and short to power.
OK or NG
OK©GO TO 11.
NG©GO TO 10.
10 DETECT MALFUNCTIONING PART
Check harness for open or short between fuel pump relay and fuel pump.
©Repair open circuit or short to ground or short to power in harness or connectors.
11 CHECK FUEL PUMP RELAY OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect ECM harness connector.
2. Check harness continuity between ECM terminal 28 and fuel pump relay-1 terminal 1. Refer to Wiring Diagram.
Continuity should exist.
3. Also check harness for short to ground and short to power.
OK or NG
OK©GO TO 13.
NG©GO TO 12.
12 DETECT MALFUNCTIONING PART
Check the following.
IHarness connectors E1, M1
IHarness connectors M32, F23
IHarness for open or short between ECM and fuel pump relay-1
©Repair open circuit or short to ground or short to power in harness or connectors.
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FUEL PUMP
Diagnostic Procedure (Cont'd)
EC-631

13 CHECK FUEL PUMP RELAY-1 AND -2
With CONSULT-II
1. Reconnect fuel pump relay-1 and -2, fuel level sensor unit and fuel pump harness connector and ECM harness con-
nector.
2. Turn ignition switch ªONº.
3. Turn fuel pump relay-1, -2 ªONº and ªOFFº in ªACTIVE TESTº mode with CONSULT-II and check operating sound.
SEF073Y
Without CONSULT-II
Check continuity between terminals 3 and 5 under the following conditions.
SEF608X
OK or NG
OK©GO TO 14.
NG©Replace fuel pump relay.
14 CHECK FUEL PUMP
1. Disconnect fuel level sensor unit and fuel pump harness connector.
2. Check resistance between fuel level sensor unit and fuel pump terminals 1 and 2.
SEF027Z
OK or NG
OK©GO TO 15.
NG©Replace fuel pump.
FUEL PUMP
Diagnostic Procedure (Cont'd)
EC-632

15 CHECK INTERMITTENT INCIDENT
Refer to ªTROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENTº, EC-140.
©INSPECTION ENDGI
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FUEL PUMP
Diagnostic Procedure (Cont'd)
EC-633

Fuel Pressure RegulatorNBEC0408
Fuel pressure at idling kPa (kg/cm2, psi)
Vacuum hose is connected. Approximately 235 (2.4, 34)
Vacuum hose is disconnected. Approximately 294 (3.0, 43)
Idle Speed and Ignition TimingNBEC0409
Target idle speed*1 No-load*2 (in ªPº or Nº position) 750±50 rpm
Air conditioner: ON In ªPº or Nº position 825 rpm or more
Ignition timing*1 In ªPº or Nº position 15ɱ5É BTDC
Throttle position sensor idle position0.15 - 0.85V
*1: Throttle position sensor harness connector connected
*2: Under the following conditions:
IAir conditioner switch: OFF
IElectric load: OFF (Lights, heater fan & rear window defogger)
ISteering wheel: Kept in straight-ahead position
Mass Air Flow SensorNBEC0411
Supply voltageBattery voltage (11 - 14)V
Output voltage at idle1.2 - 1.8*V
Mass air flow (Using CONSULT-II or GST)2.0 - 6.0 g´m/sec at idle*
7.0 - 20.0 g´m/sec at 2,500 rpm*
*: Engine is warmed up to normal operating temperature and running under no-load.
Engine Coolant Temperature SensorNBEC0412
Temperature ÉC (ÉF) Resistance kW
20 (68) 2.1 - 2.9
50 (122) 0.68 - 1.00
90 (194) 0.236 - 0.260
Heated Oxygen Sensor 1 Heater (Front)NBEC0414
Resistance [at 25ÉC (77ÉF)]2.3 - 4.3W
Fuel PumpNBEC0415
Resistance [at 25ÉC (77ÉF)]0.2 - 5.0W
IACV-AAC ValveNBEC0416
Resistance [at 20ÉC (68ÉF)]Approximately 20 - 24W
InjectorNBEC0417
Resistance [at 20ÉC (68ÉF)]13.5 - 17.5W
ResistorNBEC0418
Resistance [at 25ÉC (77ÉF)]Approximately 2.2 kW
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SERVICE DATA AND SPECIFICATIONS (SDS)
Fuel Pressure Regulator
EC-649

Throttle Position SensorNBEC0419
Throttle valve conditionsVoltage
(at normal operating temperature,
engine off, ignition switch ON,
throttle opener disengaged)
Completely closed (a)0.15 - 0.85V
Partially openBetween (a) and (b)
Completely open (b)3.5 - 4.7V
Calculated Load ValueNBEC0420
Calculated load value % (Using CONSULT-II or GST)
At idle14.0 - 33.0
At 2,500 rpm12.0 - 25.0
Intake Air Temperature SensorNBEC0421
Temperature ÉC (ÉF) Resistance kW
20 (68)2.1 - 2.9
80 (176)0.27 - 0.38
Heated Oxygen Sensor 2 Heater (Rear)NBEC0422
Resistance [at 25ÉC (77ÉF)]2.3 - 4.3W
Crankshaft Position Sensor (REF)NBEC0423
Resistance [at 20ÉC (68ÉF)]470 - 570W
Fuel Tank Temperature SensorNBEC0424
Temperature ÉC (ÉF) Resistance kW
20 (68)2.3 - 2.7
50 (122)0.79 - 0.90
Camshaft Position Sensor (PHASE)NBEC0639
Resistance [at 20ÉC (68ÉF)]HITACHI make 1,440 - 1,760W
MITSUBISHI make 2,090 - 2,550W
SERVICE DATA AND SPECIFICATIONS (SDS)
Throttle Position Sensor
EC-650

Electrical Components Inspection ...........................108
COMPASS AND THERMOMETER............................. 110
System Description .................................................. 110
Wiring Diagram - COMPAS -................................... 111
Trouble Diagnoses................................................... 112
Calibration Procedure for Compass ........................ 113
WARNING LAMPS...................................................... 114
Schematic ................................................................ 114
Wiring Diagram - WARN - ....................................... 115
Fuel Warning Lamp Sensor Check .........................122
Electrical Components Inspection ...........................122
A/T INDICATOR...........................................................123
Wiring Diagram - AT/IND -.......................................123
WARNING CHIME.......................................................125
Component Parts and Harness Connector
Location ...................................................................125
System Description ..................................................125
Wiring Diagram - CHIME - ......................................127
Trouble Diagnoses...................................................129
FRONT WIPER AND WASHER..................................136
System Description ..................................................136
Wiring Diagram - WIPER - ......................................138
Removal and Installation .........................................139
Washer Nozzle Adjustment .....................................140
Washer Tube Layout ...............................................140
REAR WIPER AND WASHER....................................141
System Description ..................................................141
Wiring Diagram - WIP/R -........................................143
Trouble Diagnoses...................................................145
Removal and Installation .........................................145
Washer Nozzle Adjustment .....................................146
Washer Tube Layout ...............................................146
Check Valve .............................................................146
HORN...........................................................................147
Wiring Diagram - HORN - .......................................147
CIGARETTE LIGHTER................................................148
Wiring Diagram - CIGAR -.......................................148
CLOCK.........................................................................150
Wiring Diagram - CLOCK -......................................150
REAR WINDOW DEFOGGER.....................................151
Component Parts and Harness Connector
Location ...................................................................151
System Description ..................................................151
Wiring Diagram - DEF - ...........................................153
Trouble Diagnoses...................................................155
Electrical Components Inspection ...........................157
Filament Check ........................................................157
Filament Repair .......................................................158
AUDIO..........................................................................160
System Description ..................................................160
Schematic ................................................................161
Wiring Diagram - AUDIO - .......................................162Trouble Diagnoses...................................................166
Inspection.................................................................167
Wiring Diagram - REMOTE -...................................168
AUDIO ANTENNA.......................................................169
System Description ..................................................169
Wiring Diagram - P/ANT - .......................................170
Trouble Diagnoses...................................................171
Location of Antenna .................................................171
Antenna Rod Replacement .....................................171
POWER SUNROOF.....................................................173
System Description ..................................................173
Wiring Diagram - SROOF - .....................................174
Trouble Diagnoses...................................................176
DOOR MIRROR...........................................................177
Wiring Diagram - MIRROR - ...................................177
GLASS HATCH OPENER...........................................178
System Description ..................................................178
Wiring Diagram - TLID - ..........................................179
FUEL FILLER LID OPENER.......................................180
Wiring Diagram - F/LID - .........................................180
POWER SEAT.............................................................181
Wiring Diagram - SEAT - .........................................181
HEATED SEAT............................................................183
Wiring Diagram - HSEAT - ......................................183
Seatback Heating Unit .............................................185
AUTOMATIC DRIVE POSITIONER............................186
Component Parts and Harness Connector
Location ...................................................................186
System Description ..................................................187
Schematic ................................................................190
Wiring Diagram - AUT/DP - .....................................191
On Board Diagnosis ................................................196
Trouble Diagnoses...................................................198
AUTOMATIC SPEED CONTROL DEVICE (ASCD)...221
Component Parts and Harness Connector
Location ...................................................................221
System Description ..................................................222
Schematic ................................................................224
Wiring Diagram - ASCD - ........................................225
Fail-safe System ......................................................229
Trouble Diagnoses...................................................230
Electrical Component Inspection .............................239
ASCD Wire Adjustment ...........................................240
POWER WINDOW.......................................................241
System Description ..................................................241
Schematic ................................................................244
Wiring Diagram - WINDOW - ..................................245
Trouble Diagnoses...................................................250
POWER DOOR LOCK.................................................254
Component Parts and Harness Connector
Location ...................................................................254
System Description ..................................................254
CONTENTS(Cont'd)
EL-2

SEL350X
Aiming AdjustmentNBEL0029Before performing aiming adjustment, make sure of the following.
1) Keep all tires inflated to correct pressure.
2) Place vehicle on level ground.
3) See that vehicle is unloaded (except for full levels of coolant,
engine oil and fuel, and spare tire, jack, and tools). Have the
driver or equivalent weight placed in driver's seat.
Adjust aiming in the vertical direction by turning the adjusting
screw.
MEL327G
1. Set the distance between the screen and the center of the fog
lamp lens as shown at left.
2. Turn front fog lamps ON.
MEL328GA
3. Adjust front fog lamps so that the top edge of the high inten-
sity zone is 200 mm (7.9 in) below the height of the fog lamp
centers as shown at left.
IWhen performing adjustment, if necessary, cover the head-
lamps and opposite fog lamp.
FRONT FOG LAMP
Aiming Adjustment
EL-74

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