check engine NISSAN X-TRAIL 2003 Electronic Repair Manual

EC-5
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ECA DTC P1805 BRAKE SWITCH ................................ 329
Description ........................................................... 329
CONSULT-II Reference Value in Data Monitor Mode
. 329
ECM Terminals and Reference Value .................. 329
On Board Diagnosis Logic ................................... 329
DTC Confirmation Procedure ............................... 329
Wiring Diagram .................................................... 330
Diagnostic Procedure ........................................... 331
Component Inspection ......................................... 332
IGNITION SIGNAL .................................................. 334
Component Description ........................................ 334
ECM Terminals and Reference Value .................. 334
Wiring Diagram .................................................... 335
Diagnostic Procedure ........................................... 337
Component Inspection ......................................... 341
Removal and Installation ...................................... 342
INJECTOR CIRCUIT ............................................... 343
Component Description ........................................ 343
CONSULT-II Reference Value in Data Monitor Mode
. 343
ECM Terminals and Reference Value .................. 343
Wiring Diagram .................................................... 344
Diagnostic Procedure ........................................... 345
Component Inspection ......................................... 347
Removal and Installation ...................................... 347
START SIGNAL ...................................................... 348
CONSULT-II Reference Value in Data Monitor Mode
. 348
ECM Terminals and Reference Value .................. 348
Wiring Diagram .................................................... 349
Diagnostic Procedure ........................................... 350
FUEL PUMP CIRCUIT ............................................ 352
Description ........................................................... 352
CONSULT-II Reference Value in Data Monitor Mode
. 352
ECM Terminals and Reference Value .................. 352
Wiring Diagram .................................................... 354
Diagnostic Procedure ........................................... 355
Component Inspection ......................................... 357
Removal and Installation ...................................... 358
REFRIGERANT PRESSURE SENSOR ................. 359
Component Description ........................................ 359
ECM Terminals and Reference Value .................. 359
Wiring Diagram .................................................... 360
Diagnostic Procedure ........................................... 361
Removal and Installation ...................................... 362
ELECTRICAL LOAD SIGNAL ................................ 363
CONSULT-II Reference Value in Data Monitor Mode
. 363
ECM Terminals and Reference Value .................. 363
Wiring Diagram .................................................... 364
Diagnostic Procedure ........................................... 366
DATA LINK CONNECTOR ..................................... 371
Wiring Diagram .................................................... 371
EVAPORATIVE EMISSION SYSTEM ..................... 372
Description ........................................................... 372
Component Inspection ......................................... 374POSITIVE CRANKCASE VENTILATION ...............375
Description ............................................................375
Component Inspection ..........................................375
SERVICE DATA AND SPECIFICATIONS (SDS) ....377
Fuel Pressure .......................................................377
Idle Speed and Ignition Timing .............................377
Calculated Load Value ..........................................377
Mass Air Flow Sensor ...........................................377
Intake Air Temperature Sensor .............................377
Engine Coolant Temperature Sensor ...................377
Heated Oxygen Sensor 1 Heater .........................377
Heated Oxygen sensor 2 Heater ..........................377
Crankshaft Position Sensor (POS) .......................377
Camshaft Position Sensor (PHASE) ....................377
Throttle Control Motor ...........................................378
Injector ..................................................................378
Fuel Pump ............................................................378
QR (WITHOUT EURO-OBD)
INDEX FOR DTC .....................................................379
Alphabetical Index ................................................379
DTC No. Index ......................................................380
PRECAUTIONS ......................................................381
Precautions for Supplemental Restraint System
(SRS) “AIR BAG” and “SEAT BELT PRE-TEN-
SIONER” ...............................................................381
On Board Diagnostic (OBD) System of Engine and
A/T ........................................................................381
Precaution ............................................................381
Wiring Diagrams and Trouble Diagnosis ..............384
PREPARATION .......................................................385
Special Service Tools ...........................................385
Commercial Service Tools ....................................385
ENGINE CONTROL SYSTEM ................................387
System Diagram ...................................................387
Vacuum Hose Drawing .........................................388
System Chart ........................................................389
Multiport Fuel Injection (MFI) System ...................389
Electronic Ignition (EI) System .............................392
Air Conditioning Cut Control .................................392
Fuel Cut Control (at No Load and High Engine
Speed) ..................................................................393
CAN communication .............................................393
BASIC SERVICE PROCEDURE .............................395
Idle Speed and Ignition Timing Check ..................395
Throttle Valve Closed Position Learning ...............396
Accelerator Pedal Released Position Learning ....396
Idle Air Volume Learning ......................................396
Fuel Pressure Check ............................................399
ON BOARD DIAGNOSTIC (OBD) SYSTEM ..........401
Introduction ...........................................................401
Two Trip Detection Logic ......................................401
Emission-related Diagnostic Information ..............401
NATS (Nissan Anti-theft System) .........................403
Malfunction Indicator (MI) .....................................404
TROUBLE DIAGNOSIS ..........................................407
Trouble Diagnosis Introduction .............................407

EC-6
DTC Inspection Priority Chart ...............................410
Fail-safe Chart ......................................................411
Basic Inspection ...................................................412
Symptom Matrix Chart ..........................................417
Engine Control Component Parts Location ..........421
Circuit Diagram .....................................................425
ECM Harness Connector Terminal Layout ...........427
ECM Terminals and Reference Value ...................427
CONSULT-II Function ...........................................434
CONSULT-II Reference Value in Data Monitor .....443
Major Sensor Reference Graph in Data Monitor
Mode .....................................................................446
TROUBLE DIAGNOSIS - SPECIFICATION VALUE. 449
Description ............................................................449
Testing Condition ..................................................449
Inspection Procedure ............................................449
Diagnostic Procedure ...........................................450
TROUBLE DIAGNOSIS FOR INTERMITTENT INCI-
DENT .......................................................................453
Description ............................................................453
Diagnostic Procedure ...........................................453
POWER SUPPLY CIRCUIT FOR ECM ...................454
Wiring Diagram .....................................................454
ECM Terminals and Reference Value ...................455
Diagnostic Procedure ...........................................455
Component Inspection ..........................................459
DTC U1000 CAN COMMUNICATION LINE ............460
Description ............................................................460
On Board Diagnosis Logic ....................................460
DTC Confirmation Procedure ...............................460
Wiring Diagram .....................................................461
Diagnostic Procedure ...........................................462
DTC P0102, P0103 MAF SENSOR .........................463
Component Description ........................................463
CONSULT-II Reference Value in Data Monitor Mode
.463
ECM Terminals and Reference Value ...................463
On Board Diagnosis Logic ....................................464
DTC Confirmation Procedure ...............................464
Wiring Diagram .....................................................466
Diagnostic Procedure ...........................................467
Component Inspection ..........................................469
Removal and Installation ......................................469
DTC P0117, P0118 ECT SENSOR ..........................470
Component Description ........................................470
On Board Diagnosis Logic ....................................470
DTC Confirmation Procedure ...............................471
Wiring Diagram .....................................................472
Diagnostic Procedure ...........................................473
Component Inspection ..........................................474
Removal and Installation ......................................474
DTC P0120 TP SENSOR ........................................475
Component Description ........................................475
CONSULT-II Reference Value in Data Monitor Mode
.475
ECM Terminals and Reference Value ...................475
On Board Diagnosis Logic ....................................476
DTC Confirmation Procedure ...............................476Wiring Diagram ..................................................... 479
Diagnostic Procedure ............................................ 480
Component Inspection .......................................... 482
Remove and Installation ....................................... 483
DTC P0121 APP SENSOR ...................................... 484
Component Description ........................................ 484
CONSULT-II Reference Value in Data Monitor Mode
. 484
ECM Terminals and Reference Value ................... 484
On Board Diagnosis Logic .................................... 485
DTC Confirmation Procedure ................................ 485
Wiring Diagram ..................................................... 486
Diagnostic Procedure ............................................ 487
Component Inspection .......................................... 489
Remove and Installation ....................................... 489
DTC P0134 HO2S1 ................................................. 490
Component Description ........................................ 490
CONSULT-II Reference Value in Data Monitor Mode
. 490
ECM Terminals and Reference Value ................... 490
On Board Diagnosis Logic .................................... 491
Overall Function Check ......................................... 491
Wiring Diagram ..................................................... 492
Diagnostic Procedure ............................................ 493
Component Inspection .......................................... 494
Removal and Installation ....................................... 495
DTC P0327, P0328 KS ............................................ 496
Component Description ........................................ 496
ECM Terminals and Reference Value ................... 496
On Board Diagnosis Logic .................................... 496
DTC Confirmation Procedure ................................ 496
Wiring Diagram ..................................................... 498
Diagnostic Procedure ............................................ 499
Component Inspection .......................................... 500
Removal and Installation ....................................... 500
DTC P0335 CKP SENSOR (POS) .......................... 501
Component Description ........................................ 501
CONSULT-II Reference Value in Data Monitor Mode
. 501
ECM Terminals and Reference Value ................... 501
On Board Diagnosis Logic .................................... 502
DTC Confirmation Procedure ................................ 502
Wiring Diagram ..................................................... 503
Diagnostic Procedure ............................................ 504
Component Inspection .......................................... 505
Removal and Installation ....................................... 506
DTC P0340 CMP SENSOR (PHASE) ..................... 507
Component Description ........................................ 507
ECM Terminals and Reference Value ................... 507
On Board Diagnosis Logic .................................... 507
DTC Confirmation Procedure ................................ 508
Wiring Diagram ..................................................... 509
Diagnostic Procedure ............................................ 510
Component Inspection .......................................... 512
Removal and Installation ....................................... 512
DTC P0500 VSS ...................................................... 513
Component Description ........................................ 513
ECM Terminals and Reference Value ................... 513

EC-7
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ECA On Board Diagnosis Logic ................................... 513
DTC Confirmation Procedure ............................... 513
Overall Function Check ........................................ 514
Wiring Diagram .................................................... 515
Diagnostic Procedure ........................................... 517
DTC P0550 PSP SENSOR ..................................... 518
Component Description ........................................ 518
CONSULT-II Reference Value in Data Monitor Mode
. 518
ECM Terminals and Reference Value .................. 518
On Board Diagnosis Logic ................................... 518
DTC Confirmation Procedure ............................... 518
Wiring Diagram .................................................... 520
Diagnostic Procedure ........................................... 521
Component Inspection ......................................... 522
DTC P0605 ECM .................................................... 523
Component Description ........................................ 523
On Board Diagnosis Logic ................................... 523
DTC Confirmation Procedure ............................... 523
Diagnostic Procedure ........................................... 525
DTC P0650 MI ........................................................ 526
Component Description ........................................ 526
On Board Diagnosis Logic ................................... 526
DTC Confirmation Procedure ............................... 526
Overall Function Check ........................................ 526
Wiring Diagram .................................................... 527
Diagnostic Procedure ........................................... 528
DTC P1065 ECM POWER SUPPLY ....................... 530
Component Description ........................................ 530
On Board Diagnosis Logic ................................... 530
DTC Confirmation Procedure ............................... 530
Wiring Diagram .................................................... 531
Diagnostic Procedure ........................................... 532
DTC P1121 ELECTRIC THROTTLE CONTROL
ACTUATOR ............................................................ 534
Description ........................................................... 534
On Board Diagnosis Logic ................................... 534
DTC Confirmation Procedure ............................... 534
Diagnostic Procedure ........................................... 535
DTC P1122 ELECTRIC THROTTLE CONTROL
FUNCTION .............................................................. 536
Description ........................................................... 536
ECM Terminals and Reference Value .................. 536
On Board Diagnosis Logic ................................... 536
DTC Confirmation Procedure ............................... 537
Wiring Diagram .................................................... 538
Diagnostic Procedure ........................................... 539
Component Inspection ......................................... 540
DTC P1123 THROTTLE CONTROL MOTOR RELAY. 542
Component Description ........................................ 542
CONSULT-II Reference Value in Data Monitor Mode
. 542
ECM Terminals and Reference Value .................. 542
On Board Diagnosis Logic ................................... 542
DTC Confirmation Procedure ............................... 542
Wiring Diagram .................................................... 544
Diagnostic Procedure ........................................... 545
Component Inspection ......................................... 546DTC P1212 ESP/TCS/ABS COMMUNICATION
LINE ........................................................................547
Description ............................................................547
On Board Diagnosis Logic ....................................547
DTC Confirmation Procedure ...............................547
Diagnostic Procedure ...........................................547
DTC P1217 ENGINE OVER TEMPERATURE ........548
System Description ...............................................548
CONSULT-II Reference Value in Data Monitor Mode
.548
ECM Terminals and Reference Value ...................549
On Board Diagnosis Logic ....................................549
Overall Function Check ........................................549
Wiring Diagram .....................................................552
Diagnostic Procedure ...........................................553
Main 12 Causes of Overheating ...........................560
Component Inspection ..........................................561
DTC P1805 BRAKE SWITCH .................................562
Description ............................................................562
CONSULT-II Reference Value in Data Monitor Mode
.562
ECM Terminals and Reference Value ...................562
On Board Diagnosis Logic ....................................562
DTC Confirmation Procedure ...............................562
Wiring Diagram .....................................................564
Diagnostic Procedure ...........................................565
Component Inspection ..........................................566
HO2S1 HEATER .....................................................568
Description ............................................................568
CONSULT-II Reference Value in Data Monitor Mode
.568
ECM Terminals and Reference Value ...................568
Wiring Diagram .....................................................569
Diagnostic Procedure ...........................................570
Component Inspection ..........................................572
Removal and Installation ......................................572
HO2S2 HEATER .....................................................573
Description ............................................................573
CONSULT-II Reference Value in Data Monitor Mode
.573
ECM Terminals and Reference Value ...................573
Wiring Diagram .....................................................574
Diagnostic Procedure ...........................................575
Component Inspection ..........................................576
Removal and Installation ......................................576
IAT SENSOR ...........................................................577
Component Description ........................................577
Wiring Diagram .....................................................578
Diagnostic Procedure ...........................................579
Component Inspection ..........................................580
Removal and Installation ......................................580
HO2S1 .....................................................................581
Component Description ........................................581
CONSULT-II Reference Value in Data Monitor Mode
.581
ECM Terminals and Reference Value ...................581
Wiring Diagram .....................................................582
Diagnostic Procedure ...........................................583

EC-12
[QR (WITH EURO-OBD)]
INDEX FOR DTC
[QR (WITH EURO-OBD)]INDEX FOR DTCPFP:00024
Alphabetical IndexEBS00B0G
Check if the vehicle is a model with Euro-OBD (E-OBD) system or not by the "Type approval number" on the
identification plate. Refer toGI-45, "
IDENTIFICATION PLATE".
NOTE:
If DTC U1000 is displayed with other DTC, first perform the trouble diagnosis for DTC U1000. Refer to
EC-114
.
Items
(CONSULT-II screen terms)DTC*1
Reference page
CONSULT-II
GST*2ECM*3
APP SEN/CIRCUIT P0121 0121EC-154
A/T 1ST GR FNCTN P0731 0731AT-151
A/T 2ND GR FNCTN P0732 0732AT-158
A/T 3RD GR FNCTN P0733 0733AT-165
A/T 4TH GR FNCTN P0734 0734AT-172
ATF TEMP SEN/CIRC P0710 0710AT-136
BRAKE SW/CIRCUIT P1805 1805EC-329
CAN COMM CIRCUIT*7 U1000 1000*6EC-114
CKP SEN/CIRCUIT P0335 0335EC-217
CMP SEN/CIRCUIT P0340 0340EC-223
CYL 1 MISFIRE P0301 0301EC-206
CYL 2 MISFIRE P0302 0302EC-206
CYL 3 MISFIRE P0303 0303EC-206
CYL 4 MISFIRE P0304 0304EC-206
ECM P0605 0605EC-249
ECM BACK UP/CIRC P1065 1065EC-256
ECT SEN/CIRCUIT*5 P0117 0117EC-141
ECT SEN/CIRCUIT*5 P0118 0118EC-141
ENG OVER TEMP P1217 1217EC-311
ENGINE SPEED SIG P0725 0725AT-147
E T C A C T R P 11 2 1 11 2 1EC-271
ETC FUNCTION/CIRC P1122 1122EC-273
ETC MOT RLY/CIRC P1123 1123EC-279
FUEL SYS-LEAN-B1 P0171 0171EC-194
FUEL SYS-RICH-B1 P0172 0172EC-200
HO2S1 (B1) P0132 0132EC-160
HO2S1 (B1) P0133 0133EC-166
HO2S1 (B1) P0134 0134EC-174
HO2S1 (B1) P1143 1143EC-284
HO2S1 (B1) P1144 1144EC-290
HO2S1 HTR (B1) P0031 0031EC-120
HO2S1 HTR (B1) P0032 0032EC-120
HO2S2 (B1) P0138 0138EC-181
HO2S2 (B1) P0139 0139EC-187
HO2S2 (B1) P1146 1146EC-296
HO2S2 (B1) P1147 1147EC-303

EC-20
[QR (WITH EURO-OBD)]
PREPARATION
PREPARATION
PFP:00002
Special Service ToolsEBS00B0M
The actual shapes of Kent-Moore tools may differ from those of special service tools illustrated here.
Commercial Service ToolsEBS00B0N
Tool number
Tool nameDescription
KV10117100
Heated oxygen
sensor wrenchLoosening or tightening heated oxygen sensors
with 22 mm (0.87 in) hexagon nut
KV10114400
Heated oxygen
sensor wrenchLoosening or tightening heated oxygen sensors
a: 22 mm (0.87 in)
S-NT379
S-NT636
Tool name (Kent-
Moore No.)Description
Quick connector
releaseRemoving fuel tube quick connectors in engine
room
(Available in SEC. 164 of PARTS CATALOG:
Part No. 16441 6N210)
Fuel filler cap adapter Checking fuel tank vacuum relief valve opening
pressure
Socket wrench Removing and installing engine coolant
temperature sensor
PBIC0198E
S-NT653
S-NT705

BASIC SERVICE PROCEDURE
EC-31
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–Check ignition timing.
Throttle Valve Closed Position LearningEBS00B0X
DESCRIPTION
“Throttle Valve Closed Position Learning” is an operation to learn the fully closed position of the throttle valve
by monitoring the throttle position sensor output signal. It must be performed each time harness connector of
electric throttle control actuator or ECM is disconnected.
OPERATION PROCEDURE
1. Make sure that accelerator pedal is fully released.
2. Turn ignition switch “ON”.
3. Turn ignition switch “OFF” wait at least 10 seconds.
Make sure that throttle valve moves during above 10 seconds by confirming the operating sound.
Accelerator Pedal Released Position LearningEBS00BLU
DESCRIPTION
“Accelerator Pedal Released Position Learning” is an operation to learn the fully released position of the accel-
erator pedal by monitoring the accelerator pedal position sensor output signal. It must be performed each time
harness connector of accelerator pedal position sensor or ECM is disconnected.
OPERATION PROCEDURE
1. Make sure that accelerator pedal is fully released.
2. Turn ignition switch “ON” and wait at least 2 seconds.
3. Turn ignition switch “OFF” wait at least 10 seconds.
4. Turn ignition switch “ON” and wait at least 2 seconds.
5. Turn ignition switch “OFF” wait at least 10 seconds.
Idle Air Volume LearningEBS00B0Y
DESCRIPTION
“Idle Air Volume Learning” is an operation to learn the idle air volume that keeps each engine within the spe-
cific range. It must be performed under any of the following conditions:
lEach time electric throttle control actuator or ECM is replaced.
lIdle speed or ignition timing is out of specification.
SEF166Y
PBIB0514E

EC-32
[QR (WITH EURO-OBD)]
BASIC SERVICE PROCEDURE
PREPARATION
Before performing “Idle Air Volume Learning”, make sure that all of the following conditions are satisfied.
Learning will be cancelled if any of the following conditions are missed for even a moment.
lBattery voltage: More than 12.9V (At idle)
lEngine coolant temperature: 70 - 100°C (158 - 212°F)
lPNP switch: ON
lElectric load switch: OFF
(Air conditioner, headlamp, rear window defogger)
On vehicles equipped with daytime light systems, set lighting switch to the 1st position to light
only small lamps.
lSteering wheel: Neutral (Straight-ahead position)
lVehicle speed: Stopped
lTransmission: Warmed-up
For A/T models with CONSULT-II, drive vehicle until “FLUID TEMP SE” in “DATA MONITOR” mode of “A/
T” system indicates less than 0.9V.
For A/T models without CONSULT-II and M/T models, drive vehicle for 10 minutes.
OPERATION PROCEDURE
With CONSULT-II
1. PerformEC-31, "Accelerator Pedal Released Position Learning".
2. PerformEC-31, "
Throttle Valve Closed Position Learning".
3. Start engine and warm it up to normal operating temperature.
4. Check that all items listed under the topic “PRE-CONDITIONING” (previously mentioned) are in good
order.
5. Select “IDLE AIR VOL LEARN” in “WORK SUPPORT” mode.
6. Touch “START” and wait 20 seconds.
SEF452Y
SEF454Y

BASIC SERVICE PROCEDURE
EC-33
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7. Make sure that “CMPLT” is displayed on CONSULT-II screen. If
“INCMP” is displayed, “Idle Air Volume Learning” will not be car-
ried out successfully. In this case, find the cause of the problem
by referring to the “Diagnostic Procedure” below.
8. Rev up the engine two or three times and make sure that idle
speed and ignition timing are within the specifications.
Without CONSULT-II
NOTE:
lIt is better to count the time accurately with a clock.
lIt is impossible to switch the diagnostic mode when an accelerator pedal position sensor circuit
has a malfunction.
1. PerformEC-31, "
Accelerator Pedal Released Position Learning".
2. PerformEC-31, "
Throttle Valve Closed Position Learning".
3. Start engine and warm it up to normal operating temperature.
4. Check that all items listed under the topic “PRE-CONDITIONING” (previously mentioned) are in good
order.
5. Turn ignition switch “OFF” and wait at least 10 seconds.
6. Confirm that accelerator pedal is fully released, turn ignition switch “ON” and wait 3 seconds.
7. Repeat the following procedure quickly five times within 5 seconds.
a. Fully depress the accelerator pedal.
b. Fully release the accelerator pedal.
8. Wait 7 seconds, fully depress the accelerator pedal and keep it for approx. 20 seconds until the MI stops
blinking and turned ON.
9. Fully release the accelerator pedal within 3 seconds after the MI goes off.
10. Start engine and let it idle.
11. Wait 20 seconds.
12. Rev up the engine two or three times and make sure that idle speed and ignition timing are within the
specifications.
13. If idle speed and ignition timing are not within the specification, the result will be incomplete. In this case,
find the cause of the problem by referring to the “Diagnostic Procedure” below.
ITEM SPECIFICATION
Idle speed M/T: 650±50 rpm
A/T: 700±50 rpm (in “P” or “N” position)
Ignition timing M/T: 14±5°BTDC
A/T: 16±5°BTDC (in “P” or “N” position)
SEF455Y
ITEM SPECIFICATION
Idle speed M/T: 650±50 rpm
A/T: 700±50 rpm (in “P” or “N” position)
Ignition timing M/T: 14±5°BTDC
A/T: 16±5°BTDC (in “P” or “N” position)
PBIB0665E

EC-34
[QR (WITH EURO-OBD)]
BASIC SERVICE PROCEDURE
DIAGNOSTIC PROCEDURE
If idle air volume learning cannot be performed successfully, proceed as follows:
1.Check that throttle valve is fully closed.
2.Check PCV valve operation.
3.Check that downstream of throttle valve is free from air leakage.
4.When the above three items check out OK, engine component parts and their installation condi-
tion are questionable. Check and eliminate the cause of the problem.
It is useful to performEC-103, "
TROUBLE DIAGNOSIS - SPECIFICATION VALUE".
5.If any of the following conditions occur after the engine has started, eliminate the cause of the
problem and perform “Idle air volume learning” all over again:
–Engine stalls.
–Erroneous idle.
Fuel Pressure CheckEBS00B0Z
FUEL PRESSURE RELEASE
Before disconnecting fuel line, release fuel pressure from fuel line to eliminate danger.
NOTE:
Prepare pans or saucers under the disconnected fuel line because the fuel may spill out. The fuel pres-
sure cannot be completely released because QR engine models do not have fuel return system.
With CONSULT-II
1. Turn ignition switch “ON”.
2. Perform “FUEL PRESSURE RELEASE” in “WORK SUPPORT”
mode with CONSULT-II.
3. Start engine.
4. After engine stalls, crank it two or three times to release all fuel
pressure.
5. Turn ignition switch “OFF”.
Without CONSULT-II
1. Remove fuel pump fuse located in fuse box.
2. Start engine.
3. After engine stalls, crank it two or three times to release all fuel
pressure.
4. Turn ignition switch “OFF”.
5. Reinstall fuel pump fuse after servicing fuel system.
FUEL PRESSURE CHECK
CAUTION:
lThe fuel hose connection method used when taking fuel pressure check must not be used for
other purposes.
lTake care for not to scratch and not to put debris around connection area when servicing, so that
the quick connector keeps sealability with O-rings inside.
1. Release fuel pressure to zero. Refer toEC-34, "
FUEL PRESSURE RELEASE".
2. Prepare fuel hose for fuel pressure check, and connect fuel pressure gauge.
lUse suitable fuel hose for fuel pressure check (genuine NISSAN fuel hose without quick connector).
SEF214Y
PBIB0508E

BASIC SERVICE PROCEDURE
EC-35
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lTo avoid unnecessary force or tension to hose, use moderately long fuel hose for fuel pressure check.
lDo not use the fuel hose for checking fuel pressure with damage or cracks on it.
lUse Pressure Gauge to check fuel pressure.
3. Remove fuel hose. Refer toEM-17, "
INTAKE MANIFOLD".
lDo not twist or kink fuel hose because it is plastic hose.
lDo not remove fuel hose from quick connector.
lKeep the original fuel hose to be free from intrusion of dust or foreign substances with a suitable cover.
4. Install the fuel pressure gauge as shown in the figure.
lWipe off oil or dirt from hose insertion part using cloth moist-
ened with gasoline.
lApply proper amount of gasoline between top of the fuel tube
and No.1 spool.
lInsert fuel hose for fuel pressure check until it touches the
No.1 spool on fuel tube.
lUse NISSAN genuine hose clamp (part number: 16439
N4710 or 16439 40U00).
lWhen reconnecting fuel line, always use new clamps.
lWhen reconnecting fuel hose, check the original fuel hose for
damage and abnormality.
lUse a torque driver to tighten clamps.
lInstall hose clamp to the position within 1 - 2 mm (0.04 - 0.08
in).
lMake sure that clamp screw does not contact adjacent parts.
5. After connecting fuel hose for fuel pressure check, pull the hose
with a force of approximately 98 N (10 kg, 22 lb) to confirm fuel
tube does not come off.
6. Turn ignition switch "ON", and check for fuel leakage.
7. Start engine and check for fuel leakage.
8. Read the indication of fuel pressure gauge.
lDo not perform fuel pressure check with system operating. Fuel pressure gauge may indicate false
readings.
lDuring fuel pressure check, confirm for fuel leakage from fuel connection every 3 minutes.
9. If result is unsatisfactory, go to next step.
10. Check the following.
lFuel hoses and fuel tubes for clogging
lFuel filter for clogging
lFuel pump
lFuel pressure regulator for clogging
If OK, replace fuel pressure regulator.
If NG, repair or replace.Tightening torque: 1 - 1.5 N·m (0.1 - 0.15 kg-m,
9-13in-lb)
At idling:
Approximately 350 kPa (3.5 bar, 3.7 kg/cm
2,51psi)
PBIB0669E
PBIB0670E