2001 INFINITI QX4 02 sensor

Overall Function Check ...........................................492
Diagnostic Procedure ..............................................492
DTC P1165 SWIRL CONTROL VALVE CONTROL
VACUUM CHECK SWITCH.........................................493
Component Description ...........................................493
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................493
ECM Terminals and Reference Value .....................493
On Board Diagnosis Logic.......................................494
Possible Cause ........................................................494
DTC Confirmation Procedure ..................................494
Wiring Diagram ........................................................495
Diagnostic Procedure ..............................................496
DTC P1320 IGNITION SIGNAL...................................499
Component Description ...........................................499
ECM Terminals and Reference Value .....................499
On Board Diagnosis Logic.......................................499
Possible Cause ........................................................500
DTC Confirmation Procedure ..................................500
Wiring Diagram ........................................................501
Diagnostic Procedure ..............................................504
DTC P1335 CRANKSHAFT POSITION SENSOR
(CKPS) (REF)..............................................................510
Component Description ...........................................510
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................510
ECM Terminals and Reference Value .....................510
On Board Diagnosis Logic....................................... 511
Possible Cause ........................................................ 511
DTC Confirmation Procedure .................................. 511
Wiring Diagram ........................................................513
Diagnostic Procedure ..............................................514
DTC P1336 CRANKSHAFT POSITION SENSOR
(CKPS) (POS) (COG)..................................................517
Component Description ...........................................517
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................517
ECM Terminals and Reference Value .....................518
On Board Diagnosis Logic.......................................518
Possible Cause ........................................................518
DTC Confirmation Procedure ..................................519
Wiring Diagram ........................................................520
Diagnostic Procedure ..............................................521
DTC P1441 EVAP CONTROL SYSTEM (VERY
SMALL LEAK).............................................................526
On Board Diagnosis Logic.......................................526
Possible Cause ........................................................526
DTC Confirmation Procedure ..................................527
Diagnostic Procedure ..............................................529
DTC P1444 EVAP CANISTER PURGE VOLUME
CONTROL SOLENOID VALVE...................................541
Description ...............................................................541CONSULT-II Reference Value in Data Monitor
Mode ........................................................................541
ECM Terminals and Reference Value .....................542
On Board Diagnosis Logic.......................................542
Possible Cause ........................................................542
DTC Confirmation Procedure ..................................543
Wiring Diagram ........................................................544
Diagnostic Procedure ..............................................545
DTC P1446 EVAPORATIVE EMISSION (EVAP)
CANISTER VENT CONTROL VALVE (CLOSE).........553
Component Description ...........................................553
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................553
ECM Terminals and Reference Value .....................553
On Board Diagnosis Logic.......................................553
Possible Cause ........................................................554
DTC Confirmation Procedure ..................................554
Wiring Diagram ........................................................555
Diagnostic Procedure ..............................................556
DTC P1447 EVAPORATIVE EMISSION (EVAP)
CONTROL SYSTEM PURGE FLOW
MONITORING..............................................................561
System Description ..................................................561
On Board Diagnosis Logic.......................................561
Possible Cause ........................................................561
DTC Confirmation Procedure ..................................562
Overall Function Check ...........................................563
Diagnostic Procedure ..............................................564
DTC P1448 EVAPORATIVE EMISSION (EVAP)
CANISTER VENT CONTROL VALVE (OPEN)...........573
Component Description ...........................................573
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................573
ECM Terminals and Reference Value .....................573
On Board Diagnosis Logic.......................................573
Possible Cause ........................................................574
DTC Confirmation Procedure ..................................574
Overall Function Check ...........................................575
Wiring Diagram ........................................................576
Diagnostic Procedure ..............................................577
DTC P1464 FUEL LEVEL SENSOR CIRCUIT
(GROUND SIGNAL)....................................................582
Component Description ...........................................582
On Board Diagnostic Logic......................................582
Possible Cause ........................................................582
DTC Confirmation Procedure ..................................582
Wiring Diagram ........................................................583
Diagnostic Procedure ..............................................584
DTC P1490 VACUUM CUT VALVE BYPASS
VALVE (CIRCUIT)........................................................585
Description ...............................................................585
CONTENTS(Cont'd)
EC-6

CONSULT-II Reference Value in Data Monitor
Mode ........................................................................585
ECM Terminals and Reference Value .....................585
On Board Diagnosis Logic.......................................586
Possible Cause ........................................................586
DTC Confirmation Procedure ..................................586
Wiring Diagram ........................................................587
Diagnostic Procedure ..............................................588
DTC P1491 VACUUM CUT VALVE BYPASS
VALVE..........................................................................591
Description ...............................................................591
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................591
ECM Terminals and Reference Value .....................591
On Board Diagnosis Logic.......................................592
Possible Cause ........................................................592
DTC Confirmation Procedure ..................................592
Overall Function Check ...........................................593
Wiring Diagram ........................................................594
Diagnostic Procedure ..............................................595
DTC P1605 A/T DIAGNOSIS COMMUNICATION
LINE.............................................................................603
Component Description ...........................................603
On Board Diagnosis Logic.......................................603
Possible Cause ........................................................603
DTC Confirmation Procedure ..................................603
DTC P1706 PARK/NEUTRAL POSITION (PNP)
SWITCH.......................................................................604
Component Description ...........................................604
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................604
ECM Terminals and Reference Value .....................604
On Board Diagnosis Logic.......................................604
Possible Cause ........................................................604
DTC Confirmation Procedure ..................................605
Overall Function Check ...........................................606
Wiring Diagram ........................................................607
Diagnostic Procedure ..............................................608
VARIABLE INDUCTION AIR CONTROL SYSTEM
(VIAS)...........................................................................610
Description ...............................................................610
ECM Terminals and Reference Value ..................... 611
Wiring Diagram ........................................................612
Diagnostic Procedure ..............................................613
INJECTOR...................................................................616
Component Description ...........................................616
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................616
ECM Terminals and Reference Value .....................616
Wiring Diagram ........................................................617Diagnostic Procedure ..............................................618
START SIGNAL...........................................................621
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................621
ECM Terminals and Reference Value .....................621
Wiring Diagram ........................................................622
Diagnostic Procedure ..............................................623
FUEL PUMP.................................................................625
System Description ..................................................625
Component Description ...........................................625
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................625
ECM Terminals and Reference Value .....................626
Wiring Diagram ........................................................627
Diagnostic Procedure ..............................................628
POWER STEERING OIL PRESSURE SWITCH.........634
Component Description ...........................................634
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................634
ECM Terminals and Reference Value .....................634
Wiring Diagram ........................................................635
Diagnostic Procedure ..............................................636
REFRIGERANT PRESSURE SENSOR......................639
Description ...............................................................639
ECM Terminals and Reference Value .....................639
Wiring Diagram ........................................................640
Diagnostic Procedure ..............................................641
ELECTRICAL LOAD SIGNAL.....................................643
ECM Terminals and Reference Value .....................643
Wiring Diagram ........................................................644
Diagnostic Procedure ..............................................645
MIL & DATA LINK CONNECTORS............................648
Wiring Diagram ........................................................648
SERVICE DATA AND SPECIFICATIONS (SDS).......649
Fuel Pressure Regulator..........................................649
Idle Speed and Ignition Timing ................................649
Mass Air Flow Sensor..............................................649
Engine Coolant Temperature Sensor ......................649
Heated Oxygen Sensor 1 Heater (Front) ................649
Fuel Pump ...............................................................649
IACV-AAC Valve ......................................................649
Injector .....................................................................649
Resistor ....................................................................649
Throttle Position Sensor ..........................................650
Calculated Load Value.............................................650
Intake Air Temperature Sensor ................................650
Heated Oxygen Sensor 2 Heater (Rear).................650
Crankshaft Position Sensor (REF) ..........................650
Fuel Tank Temperature Sensor ...............................650
Camshaft Position Sensor (PHASE) .......................650GI
MA
EM
LC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
CONTENTS(Cont'd)
EC-7

Items
(CONSULT-II screen terms)DTC*1 Reference page
FUEL LEVL SEN/CIRC P0464 EC-413
FUEL LEVL SEN/CIRC P1464 EC-582
FUEL LEVEL SENSOR P0461 EC-411
FUEL LV SE (SLOSH) P0460 EC-407
FUEL SYS-LEAN/BK1 P0171 EC-294
FUEL SYS-LEAN/BK2 P0174 EC-294
FUEL SYS-RICH/BK1 P0172 EC-302
FUEL SYS-RICH/BK2 P0175 EC-302
FUEL TEMP SEN/CIRC P0180 EC-309
HO2S1 HTR (B1) P0135 EC-240
HO2S1 HTR (B2) P0155 EC-240
HO2S1 (B1) P0130 EC-192
HO2S1 (B1) P0131 EC-202
HO2S1 (B1) P0132 EC-210
HO2S1 (B1) P0133 EC-218
HO2S1 (B1) P0134 EC-231
HO2S1 (B2) P0150 EC-192
HO2S1 (B2) P0151 EC-202
HO2S1 (B2) P0152 EC-210
HO2S1 (B2) P0153 EC-218
HO2S1 (B2) P0154 EC-231
HO2S2 (B1) P0137 EC-247
HO2S2 (B1) P0138 EC-257
HO2S2 (B1) P0139 EC-267
HO2S2 (B1) P0140 EC-277
HO2S2 (B2) P0157 EC-247
HO2S2 (B2) P0158 EC-257
HO2S2 (B2) P0159 EC-267
HO2S2 (B2) P0160 EC-277
HO2S2 HTR (B1) P0141 EC-286
HO2S2 HTR (B2) P0161 EC-286
IACV/AAC VLV/CIRC P0505 EC-422
IGN SIGNAL-PRIMARY P1320 EC-499
INTK TIM S/CIRC-B1 P1140 EC-482
INTK TIM S/CIRC-B2 P1145 EC-482
INT/V TIM CONT-B1 P1110 EC-446
INT/V TIM CONT-B2 P1135 EC-446
GI
MA
EM
LC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSIS Ð INDEX
Alphabetical & P No. Index for DTC (Cont'd)
EC-9

Items
(CONSULT-II screen terms)DTC*1 Reference page
INT/V TIM V/CIR-B1 P1111EC-451
INT/V TIM V/CIR-B2 P1136 EC-451
KNOCK SEN/CIRC-B1 P0325*2 EC-328
L/PRES SOL/CIRC P0745 AT-174
MAF SEN/CIRCUIT*3 P0100 EC-150
MULTI CYL MISFIRE P0300 EC-320
NATS MALFUNCTION P1610 - P1615*2 EL-328
NO DTC IS DETECTED.
FURTHER TESTING
MAY BE REQUIRED.P0000 Ð
O/R CLTCH SOL/CIRC P1760 AT-223
P-N POS SW/CIRCUIT P1706 EC-604
PNP SW/CIRC P0705 AT-111
PURG VOLUME CONT/V P0443 EC-367
PURG VOLUME CONT/V P1444 EC-541
SFT SOL A/CIRC*3 P0750 AT-180
SFT SOL B/CIRC*3 P0755 AT-189
SWIRL CONT SOL/V P1130 EC-458
SWL CON VC SW/CIRC P1165 EC-493
TCC SOLENOID/CIRC P0740 AT-165
TP SEN/CIRC A/T*3 P1705 AT-218
TRTL POS SEN/CIRC*3 P0120 EC-174
TW CATALYST SYS-B1 P0420 EC-347
TW CATALYST SYS-B2 P0430 EC-347
VC CUT/V BYPASS/V P1491 EC-591
VC/V BYPASS/V P1490 EC-585
VEH SPEED SEN/CIRC*4 P0500 EC-417
VEH SPD SEN/CIR A/T*4 P0720 AT-124
VENT CONTROL VALVE P0446 EC-374
VENT CONTROL VALVE P1446 EC-553
VENT CONTROL VALVE P1448 EC-573
*1: 1st trip DTC No. is the same as DTC No.
*2: This DTC is displayed with CONSULT-II only.
*3: When the fail-safe operation occurs, the MIL illuminates.
*4: The MIL illuminates when both the ªRevolution sensor signalº and the ªVehicle speed sensor signalº meet the fail-safe condition at
the same time.
NOTE:
IRegarding R50 models, ª-B1º and ªBK1º indicate right bank and ª-B2º and ªBK2º indicate left bank.
IBank 1 (-B1 or BK1) includes No. 1 cylinder.
TROUBLE DIAGNOSIS Ð INDEX
Alphabetical & P No. Index for DTC (Cont'd)
EC-10

DTC*1Items
(CONSULT-II screen terms)Reference page
P0217 ENG OVER TEMP EC-314
P0300 MULTI CYL MISFIRE EC-320
P0301 CYL 1 MISFIRE EC-320
P0302 CYL 2 MISFIRE EC-320
P0303 CYL 3 MISFIRE EC-320
P0304 CYL 4 MISFIRE EC-320
P0305 CYL 5 MISFIRE EC-320
P0306 CYL 6 MISFIRE EC-320
P0325*2 KNOCK SEN/CIRC-B1 EC-328
P0335 CPS/CIRCUIT (POS) EC-334
P0340 CAM PS/CIRC (PHS) EC-342
P0420 TW CATALYST SYS-B1 EC-347
P0430 TW CATALYST SYS-B2 EC-347
P0440 EVAP SMALL LEAK EC-352
P0443 PURG VOLUME CONT/V EC-367
P0446 VENT CONTROL VALVE EC-374
P0450 EVAP SYS PRES SEN EC-381
P0455 EVAP GROSS LEAK EC-394
P0460 FUEL LV SE (SLOSH) EC-407
P0461 FUEL LEVEL SENSOR EC-411
P0464 FUEL LEVL SEN/CIRC EC-413
P0500 VEH SPEED SEN/CIRC*4 EC-417
P0505 IACV/AAC VLV/CIRC EC-422
P0510 CLOSED TP SW/CIRC EC-431
P0600*2 A/T COMM LINE EC-440
P0605 ECMEC-444
P0705 PNP SW/CIRC AT-111
P0710 ATF TEMP SEN/CIRC AT-116
P0720 VEH SPD SEN/CIR A/T*4 AT-124
P0725 ENGINE SPEED SIG AT-130
P0731 A/T 1ST GR FNCTN AT-136
P0732 A/T 2ND GR FNCTN AT-143
P0733 A/T 3RD GR FNCTN AT-151
P0734 A/T 4TH GR FNCTN AT-157
P0740 TCC SOLENOID/CIRC AT-165
P0744 A/T TCC S/V FNCTN AT-170
P0745 L/PRESS SOL/CIRC AT-174
TROUBLE DIAGNOSIS Ð INDEX
Alphabetical & P No. Index for DTC (Cont'd)
EC-12

DTC*1Items
(CONSULT-II screen terms)Reference page
P0750 SFT SOL A/CIRC*3 AT-180
P0755 SFT SOL B/CIRC*3 AT-189
P1110 INT/V TIM CONT-B1 EC-446
P 1111INT/V TIM V/CIR-B1 EC-451
P1130 SWIRL CONT SOL/V EC-458
P1135 INT/V TIM CONT-B2 EC-446
P1136 INT/V TIM V/CIR-B2 EC-451
P1140 INTK TIM S/CIRC-B1 EC-482
P1145 INTK TIM S/CIRC-B2 EC-482
P1148 CLOSED LOOP-B1 EC-491
P1165 SWL CON VC SW/CIRC EC-493
P1168 CLOSED LOOP-B2 EC-491
P1217 ENG OVER TEMP LC-24
P1320 IGN SIGNAL-PRIMARY EC-499
P1335 CPS/CIRCUIT (REF) EC-510
P1336 CPS/CIRC (POS) COG EC-517
P1441 EVAP VERY SMALL LEAK EC-526
P1444 PURG VOLUME CONT/V EC-541
P1446 VENT CONTROL VALVE EC-553
P1447 EVAP PURG FLOW/MON EC-561
P1448 VENT CONTROL VALVE EC-573
P1464 FUEL LEVEL SEN/CIRC EC-582
P1490 VC/V BYPASS/V EC-585
P1491 VC CUT/V BYPASS/V EC-591
P1605 A/T DIAG COMM LINE EC-603
P1610 - P1615*2 NATS MALFUNCTION EL-328
P1705 TP SEN/CIRC A/T*3 AT-218
P1706 P-N POS SW/CIRCUIT EC-604
P1760 O/R CLTCH SOL/CIRC AT-223
*1: 1st trip DTC No. is the same as DTC No.
*2: This DTC is displayed with CONSULT-II only.
*3: When the fail-safe operation occurs, the MIL illuminates.
*4: The MIL illuminates when both the ªRevolution sensor signalº and the ªVehicle speed sensor signalº meet the fail-safe condition at
the same time.
NOTE:
IRegarding R50 models, ª-B1º and ªBK1º indicate right bank and ª-B2º and ªBK2º indicate left bank.
IBank 1 (-B1 or BK1) includes No. 1 cylinder.
GI
MA
EM
LC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSIS Ð INDEX
Alphabetical & P No. Index for DTC (Cont'd)
EC-13

Supplemental Restraint System (SRS) ªAIR
BAGº and ªSEAT BELT PRE-TENSIONERº
NBEC0002The Supplemental Restraint System such as ªAIR BAGº and ªSEAT BELT PRE-TENSIONERº used along with
a seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain types of
collision. The SRS system composition which is available to INFINITI QX4 is as follows:
IFor a frontal collision
The Supplemental Restraint System consists of driver air bag module (located in the center of the steer-
ing wheel), front passenger air bag module (located on the instrument panel on passenger side), seat belt
pre-tensioners, a diagnosis sensor unit, warning lamp, wiring harness and spiral cable.
IFor a side collision
The Supplemental Restraint System consists of front side air bag module (located in the outer side of front
seat), satellite sensor, diagnosis sensor unit (one of components of air bags for a frontal collision), wiring
harness, warning lamp (one of components of air bags for a frontal collision).
Information necessary to service the system safely is included in theRS sectionof this Service Manual.
WARNING:
ITo avoid rendering the SRS inoperative, which could increase the risk of personal injury or death
in the event of a collision which would result in air bag inflation, all maintenance must be performed
by an authorized INFINITI dealer.
IImproper maintenance, including incorrect removal and installation of the SRS, can lead to per-
sonal injury caused by unintentional activation of the system. For removal of Spiral Cable and Air
Bag Module, see the RS section.
IDo not use electrical test equipment on any circuit related to the SRS unless instructed to in this
Service Manual. Spiral cable and wiring harnesses covered with yellow insulation tape either just
before the harness connectors or for the complete harness are related to the SRS.
Precautions for On Board Diagnostic (OBD)
System of Engine and A/T
NBEC0003The ECM has an on board diagnostic system. It will light up the malfunction indicator lamp (MIL) to warn the
driver of a malfunction causing emission deterioration.
CAUTION:
IBe sure to turn the ignition switch OFF and disconnect the negative battery terminal before any
repair or inspection work. The open/short circuit of related switches, sensors, solenoid valves, etc.
will cause the MIL to light up.
IBe sure to connect and lock the connectors securely after work. A loose (unlocked) connector will
cause the MIL to light up due to the open circuit. (Be sure the connector is free from water, grease,
dirt, bent terminals, etc.)
ICertain systems and components, especially those related to OBD, may use a new style slide-
locking type harness connector. For description and how to disconnect, refer to EL-6, ªHARNESS
CONNECTOR (SLIDE-LOCKING TYPE)º.
IBe sure to route and secure the harnesses properly after work. The interference of the harness with
a bracket, etc. may cause the MIL to light up due to the short circuit.
IBe sure to connect rubber tubes properly after work. A misconnected or disconnected rubber tube
may cause the MIL to light up due to the malfunction of the fuel injection system, etc.
IBe sure to erase the unnecessary malfunction information (repairs completed) from the ECM and
TCM (Transmission control module) before returning the vehicle to the customer.
PRECAUTIONS
Supplemental Restraint System (SRS) ªAIR BAGº and ªSEAT BELT PRE-TENSIONERº
EC-14

Special Service ToolsNBEC0007The actual shapes of Kent-Moore tools may differ from those of special service tools illustrated here.
Tool number
(Kent-Moore No.)
Tool nameDescription
KV10117100
(J36471-A)
Front heated oxygen
sensor wrench
Rear heated oxygen
sensor wrench
NT379
Loosening or tightening front and rear heated oxy-
gen sensors with 22 mm (0.87 in) hexagon nut
(J44321)
Fuel pressure adapter
and gauge kit
SEF326Z
Checking fuel pressure with pressure gauge
Commercial Service ToolsNBEC0008
Tool name
(Kent-Moore No.)Description
Leak detector
(J41416)
NT703
Locating the EVAP leak
EVAP service port
adapter
(J41413-OBD)
NT704
Applying positive pressure through EVAP service
port
Fuel filler cap adapter
NT653
Checking fuel tank vacuum relief valve opening
pressure
PREPARATION
Special Service Tools
EC-18