2003 NISSAN X-TRAIL OBD port

GI-48
TERMINOLOGY

Nonvolatile random access memory NVRAM ***
On board diagnostic system OBD system Self-diagnosis
Open loop OL Open loop
Oxidation catalyst OC Catalyst
Oxidation catalytic converter system OC system ***
Oxygen sensor O2S Exhaust gas sensor
Park position switch *** Park switch
Park/neutral position switch PNP switchPark/neutral switch
Inhibitor switch
Neutral position switch
Periodic trap oxidizer system PTOX system ***
Positive crankcase ventilation PCV Positive crankcase ventilation
Positive crankcase ventilation valve PCV valve PCV valve
Powertrain control module PCM ***
Programmable read only memory PROM ***
Pulsed secondary air injection control sole-
noid valvePAIRC solenoid valve AIV control solenoid valve
Pulsed secondary air injection system PAIR system Air induction valve (AIV) control
Pulsed secondary air injection valve PAIR valve Air induction valve
Random access memory RAM ***
Read only memory ROM ***
Scan tool ST ***
Secondary air injection pump AIR pump ***
Secondary air injection system AIR system ***
Sequential multiport fuel injection system SFI system Sequential fuel injection
Service reminder indicator SRI ***
Simultaneous multiport fuel injection sys-
tem*** Simultaneous fuel injection
Smoke puff limiter system SPL system ***
Supercharger SC ***
Supercharger bypass SCB ***
System readiness test SRT ***
Thermal vacuum valve TVV Thermal vacuum valve
Three way catalyst TWC Catalyst
Three way catalytic converter system TWC system ***
Three way + oxidation catalyst TWC + OC Catalyst
Three way + oxidation catalytic converter
systemTWC + OC system ***
Throttle body TBThrottle chamber
SPI body
Throttle body fuel injection system TBI system Fuel injection control
Throttle position TP Throttle position
Throttle position sensor TPS Throttle sensor
Throttle position switch TP switch Throttle switch
Torque converter clutch solenoid valve TCC solenoid valveLock-up cancel solenoid
Lock-up solenoid NEW TERMNEW ACRONYM /
ABBREVIATIONOLD TERM

INTAKE MANIFOLD
EM-17
[QR]
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EM

INTAKE MANIFOLDPFP:14003
Removal and Installation (QR20DE)EBS00KNC
REMOVAL
1. Release fuel pressure. Refer to EC-48, "FUEL PRESSURE RELEASE" (WITH EURO-OBD) or EC-510,
"FUEL PRESSURE RELEASE" (WITHOUT EURO-OBD).
2. Remove air cleaner case upper, mass air flow sensor and air duct assembly. Refer to EM-15, "
AIR
CLEANER AND AIR DUCT" .
3. Remove quick connector caps, and disconnect quick connectors
at engine side and vehicle side. Refer to EM-32, "
Removal and
Installation (QR20DE)" .
4. Remove electric throttle control actuator with the following procedure:
a. Disconnect harness connector.
1. Vacuum hose 2. Intake manifold 3. PCV hose
4. Bracket 5. Gasket 6. Electric throttle control actuator
7. Gasket 8. Intake manifold support 9. Gasket
10. Vacuum hose 11.EVAP canister purge volume con-
trol solenoid valve12. Vacuum hose
13. Bracket 14. Bracket
PBIC2172E
PBIC2175E

EM-20
[QR]
INTAKE MANIFOLD

Removal and Installation (QR25DE)EBS011TH
REMOVAL
1. Release fuel pressure. Refer to EC-48, "FUEL PRESSURE RELEASE" (WITH EURO-OBD) or EC-510,
"FUEL PRESSURE RELEASE" (WITHOUT EURO-OBD).
2. Remove air cleaner case upper, mass air flow sensor and air duct assembly. Refer to EM-15, "
AIR
CLEANER AND AIR DUCT" .
3. Remove quick connector caps, and disconnect quick connectors
at engine side and vehicle side. Refer to EM-37, "
Removal and
Installation (QR25DE)" .
4. Remove electric throttle control actuator with the following procedure:
1. Bracket 2. PCV hose 3. Intake manifold collector
4. Gasket 5. Electric throttle control actuator 6. Intake manifold rear support
7.EVAP canister purge volume control
solenoid valve8. Vacuum hose 9. Intake manifold
10. Vacuum reservoir tank 11. VIAS control solenoid valve 12. Vacuum hose
13. Bracket 14. Intake manifold support 15. Vacuum reservoir tank bracket
PBIC2174E
PBIC2175E

EM-68
[QR]
CYLINDER HEAD

–If the compression pressure remains at low level despite the addition of engine oil, valves may be mal-
functioning. Check valves for damage. Replace valve or valve seat accordingly.

If two adjacent cylinders have respectively low compression pressure and their compression remains
low even after the addition of engine oil, gaskets are leaking. In such a case, replace cylinder head gas-
kets.
7. After inspection is completed, install removed parts.
8. Start engine, and confirm that engine runs smoothly.
9. Perform trouble diagnosis. If DTC appears, erase it. Refer to EC-73, "
TROUBLE DIAGNOSIS" (WITH
EURO-OBD) or EC-520, "
TROUBLE DIAGNOSIS" (WITHOUT EURO-OBD).
Removal and InstallationEBS00KNQ
REMOVAL
1. Release fuel pressure. Refer to EC-48, "FUEL PRESSURE RELEASE" (WITH EURO-OBD) or EC-510,
"FUEL PRESSURE RELEASE" (WITHOUT EURO-OBD).
2. Drain engine coolant and engine oil. Refer to CO-9, "
Changing Engine Coolant" and LU-8, "Changing
Engine Oil" .
3. Remove the following components and related parts.

Exhaust manifold and three way catalyst assembly; Refer to EM-23, "EXHAUST MANIFOLD AND
THREE WAY CATALYST" .

Intake manifold and fuel tube assembly (QR20DE); Refer to EM-17, "Removal and Installation
(QR20DE)" .

Intake manifold collector, intake manifold and fuel tube assembly (QR25DE); Refer to EM-20, "Removal
and Installation (QR25DE)" .

Water control valve and housing (water outlet); Refer to CO-22, "THERMOSTAT AND WATER CON-
TROL VALVE" .
NOTE:
Can be removed and installed even when assembled with cylinder head.
4. Remove front cover and timing chain. Refer to EM-44, "
TIMING CHAIN" .
5. Remove camshafts. Refer to EM-53, "
CAMSHAFT" .
6. Securely support bottom of cylinder block with a jack or equivalent tool, and release the hoist that was
supporting it.
1. Cylinder head assembly 2. Cylinder head gasket 3. Cylinder head bolt
PBIC2185E

EC-1
ENGINE CONTROL SYSTEM
B ENGINE
CONTENTS
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SECTION EC
A
EC

ENGINE CONTROL SYSTEM
QR (WITH EURO-OBD)
INDEX FOR DTC ...................................................... 19
Alphabetical Index .................................................. 19
DTC No. Index ....................................................... 21
PRECAUTIONS ........................................................ 24
Precautions for Supplemental Restraint System
(SRS) “AIR BAG” and “SEAT BELT PRE-TEN-
SIONER” ................................................................ 24
On Board Diagnostic (OBD) System of Engine and
A/T .......................................................................... 24
Precaution .............................................................. 24
Wiring Diagrams and Trouble Diagnosis ................ 27
PREPARATION ......................................................... 28
Special Service Tools ............................................. 28
Commercial Service Tools ...................................... 29
ENGINE CONTROL SYSTEM .................................. 30
System Diagram ..................................................... 30
Vacuum Hose Drawing ........................................... 32
System Chart ......................................................... 34
Multiport Fuel Injection (MFI) System .................... 34
Electronic Ignition (EI) System ............................... 37
Air Conditioning Cut Control ................................... 37
Fuel Cut Control (at No Load and High Engine
Speed) .................................................................... 38
CAN Communication Unit ...................................... 38
BASIC SERVICE PROCEDURE .............................. 44
Idle Speed and Ignition Timing Check .................... 44
Accelerator Pedal Released Position Learning ...... 45
Throttle Valve Closed Position Learning ................ 46
Idle Air Volume Learning ........................................ 46
Fuel Pressure Check .............................................. 48
ON BOARD DIAGNOSTIC (OBD) SYSTEM ............ 51
Introduction ............................................................ 51
Two Trip Detection Logic ........................................ 51
Emission-related Diagnostic Information ................ 52
NATS (Nissan Anti-theft System) ........................... 64
Malfunction Indicator (MI) ....................................... 64
OBD System Operation Chart ................................ 67
TROUBLE DIAGNOSIS ............................................ 73
Trouble Diagnosis Introduction ............................... 73DTC Inspection Priority Chart ................................. 76
Fail-safe Chart ........................................................ 77
Basic Inspection ..................................................... 79
Symptom Matrix Chart ............................................ 84
Engine Control Component Parts Location ............ 88
Circuit Diagram ....................................................... 93
ECM Harness Connector Terminal Layout ............. 95
ECM Terminals and Reference Value ..................... 95
CONSULT-II Function ...........................................102
Generic Scan Tool (GST) Function .......................112
CONSULT-II Reference Value in Data Monitor Mode
.114
Major Sensor Reference Graph in Data Monitor
Mode .....................................................................116
TROUBLE DIAGNOSIS - SPECIFICATION VALUE .119
Description ............................................................119
Testing Condition ..................................................119
Inspection Procedure ............................................119
Diagnostic Procedure ...........................................120
TROUBLE DIAGNOSIS FOR INTERMITTENT INCI-
DENT .......................................................................123
Description ............................................................123
Diagnostic Procedure ...........................................123
POWER SUPPLY AND GROUND CIRCUIT ...........124
Wiring Diagram .....................................................124
Diagnostic Procedure ...........................................125
Component Inspection ..........................................131
Ground Inspection ................................................131
DTC U1000, U1001 CAN COMMUNICATION LINE .132
Description ............................................................132
On Board Diagnosis Logic ....................................132
DTC Confirmation Procedure ...............................132
Wiring Diagram .....................................................133
Diagnostic Procedure ...........................................134
DTC P0011 IVT CONTROL .....................................135
Description ............................................................135
CONSULT-II Reference Value in Data Monitor Mode
.135
On Board Diagnosis Logic ....................................136

EC-6 PREPARATION .......................................................490
Special Service Tools ...........................................490
Commercial Service Tools ....................................491
ENGINE CONTROL SYSTEM ................................492
System Diagram ...................................................492
Vacuum Hose Drawing .........................................494
System Chart ........................................................496
Multiport Fuel Injection (MFI) System ...................496
Electronic Ignition (EI) System .............................499
Air Conditioning Cut Control .................................499
Fuel Cut Control (at No Load and High Engine
Speed) ..................................................................500
CAN Communication Unit .....................................500
BASIC SERVICE PROCEDURE .............................506
Idle Speed and Ignition Timing Check ..................506
Accelerator Pedal Released Position Learning ....507
Throttle Valve Closed Position Learning ...............508
Idle Air Volume Learning ......................................508
Fuel Pressure Check ............................................510
ON BOARD DIAGNOSTIC (OBD) SYSTEM ..........513
Introduction ...........................................................513
Two Trip Detection Logic ......................................513
Emission-related Diagnostic Information ..............513
NATS (Nissan Anti-theft System) ..........................515
Malfunction Indicator (MI) .....................................516
TROUBLE DIAGNOSIS ..........................................520
Trouble Diagnosis Introduction .............................520
DTC Inspection Priority Chart ...............................523
Fail-safe Chart ......................................................524
Basic Inspection ...................................................526
Symptom Matrix Chart ..........................................532
Engine Control Component Parts Location ..........536
Circuit Diagram .....................................................541
ECM Harness Connector Terminal Layout ...........543
ECM Terminals and Reference Value ...................543
CONSULT-II Function ...........................................551
CONSULT-II Reference Value in Data Monitor Mode
.561
Major Sensor Reference Graph in Data Monitor
Mode .....................................................................563
TROUBLE DIAGNOSIS - SPECIFICATION VALUE .566
Description ............................................................566
Testing Condition ..................................................566
Inspection Procedure ............................................566
Diagnostic Procedure ...........................................567
TROUBLE DIAGNOSIS FOR INTERMITTENT INCI-
DENT .......................................................................570
Description ............................................................570
Diagnostic Procedure ...........................................570
POWER SUPPLY AND GROUND CIRCUIT ...........571
Wiring Diagram .....................................................571
Diagnostic Procedure ...........................................572
Component Inspection ..........................................578
Ground Inspection ................................................578
DTC U1000, U1001 CAN COMMUNICATION LINE .579
Description ............................................................579
On Board Diagnosis Logic ....................................579
DTC Confirmation Procedure ...............................579Wiring Diagram .....................................................580
Diagnostic Procedure ............................................581
DTC P0011 IVT CONTROL .....................................582
Description ............................................................582
CONSULT-II Reference Value in Data Monitor Mode
.582
On Board Diagnosis Logic ....................................583
DTC Confirmation Procedure ................................583
Overall Function Check .........................................585
Wiring Diagram .....................................................586
Diagnostic Procedure ............................................587
Component Inspection ..........................................589
Removal and Installation .......................................589
DTC P0102, P0103 MAF SENSOR .........................590
Component Description ........................................590
CONSULT-II Reference Value in Data Monitor Mode
.590
On Board Diagnosis Logic ....................................590
DTC Confirmation Procedure ................................590
Wiring Diagram .....................................................592
Diagnostic Procedure ............................................593
Component Inspection ..........................................596
Removal and Installation .......................................596
DTC P0117, P0118 ECT SENSOR ..........................597
Component Description ........................................597
On Board Diagnosis Logic ....................................597
DTC Confirmation Procedure ................................598
Wiring Diagram .....................................................599
Diagnostic Procedure ............................................600
Component Inspection ..........................................602
Removal and Installation .......................................602
DTC P0122, P0123 TP SENSOR ............................603
Component Description ........................................603
CONSULT-II Reference Value in Data Monitor Mode
.603
On Board Diagnosis Logic ....................................603
DTC Confirmation Procedure ................................603
Wiring Diagram .....................................................605
Diagnostic Procedure ............................................607
Component Inspection ..........................................610
Removal and Installation .......................................610
DTC P0132 HO2S1 .................................................611
Component Description ........................................611
CONSULT-II Reference Value in Data Monitor Mode
.611
On Board Diagnosis Logic ....................................611
DTC Confirmation Procedure ................................612
Wiring Diagram .....................................................613
Diagnostic Procedure ............................................614
Component Inspection ..........................................616
Removal and Installation .......................................617
DTC P0134 HO2S1 .................................................618
Component Description ........................................618
CONSULT-II Reference Value in Data Monitor Mode
.618
On Board Diagnosis Logic ....................................618
Overall Function Check .........................................619
Wiring Diagram .....................................................620
Diagnostic Procedure ...........................................

EC-34
[QR (WITH EURO-OBD)]
ENGINE CONTROL SYSTEM

System ChartEBS010L8
*1: This sensor is not used to control the engine system under normal conditions.
*2: This input signal is sent to the ECM through CAN communication line.
*3: This output signal is sent from the ECM through CAN communication line.
*4: With ESP models.
*5: Without ESP models.
Multiport Fuel Injection (MFI) SystemEBS010L9
INPUT/OUTPUT SIGNAL CHART
*1: This sensor is not used to control the engine system under normal conditions.Input (Sensor) ECM Function Output (Actuator)

Camshaft position sensor (PHASE)

Crankshaft position sensor (POS)

Mass air flow sensor

Engine coolant temperature sensor

Heated oxygen sensor 1

Throttle position sensor

Accelerator pedal position sensor

Park/neutral position (PNP) switch

Intake air temperature sensor

Power steering pressure sensor

Ignition switch

Battery voltage

Knock sensor

Refrigerant pressure sensor

Stop lamp switch

Heated oxygen sensor 2*1

TCM (Transmission control module)*2

ESP/TCS/ABS control unit*2 *4

ABS actuator and electric unit
(control unit)*2 *5

Air conditioner switch

Wheel sensor*2

Electrical load signalFuel injection & mixture ratio control Fuel injector
Electronic ignition system Power transistor
Fuel pump control Fuel pump relay
On board diagnostic system
MI (On the instrument panel)*
3
Heated oxygen sensor 1 heater control Heated oxygen sensor 1 heater
Heated oxygen sensor 2 heater control Heated oxygen sensor 2 heater
EVAP canister purge flow controlEVAP canister purge volume control
solenoid valve
Air conditioning cut control Air conditioner relay
Cooling fan control Cooling fan relay
Sensor Input Signal to ECMECM
functionActuator
Crankshaft position sensor (POS)
Camshaft position sensor (PHASE)Engine speed*
3 and piston position
Fuel injec-
tion & mix-
ture ratio
controlFuel injector Mass air flow sensor Amount of intake air
Engine coolant temperature sensor Engine coolant temperature
Heated oxygen sensor 1 Density of oxygen in exhaust gas
Throttle position sensor Throttle position
Accelerator pedal position sensor Accelerator pedal position
Park/neutral position (PNP) switch Gear position
Knock sensor Engine knocking condition
Battery
Battery voltage*
3
Power steering pressure sensor Power steering operation
Heated oxygen sensor 2*
1Density of oxygen in exhaust gas
Wheel sensor*
2Vehicle speed
Air conditioner switch Air conditioner operation

EC-36
[QR (WITH EURO-OBD)]
ENGINE CONTROL SYSTEM


When starting the engine
MIXTURE RATIO SELF-LEARNING CONTROL
The mixture ratio feedback control system monitors the mixture ratio signal transmitted from heated oxygen
sensor 1. This feedback signal is then sent to the ECM. The ECM controls the basic mixture ratio as close to
the theoretical mixture ratio as possible. However, the basic mixture ratio is not necessarily controlled as orig-
inally designed. Both manufacturing differences (i.e., mass air flow sensor hot wire) and characteristic
changes during operation (i.e., injector clogging) directly affect mixture ratio.
Accordingly, the difference between the basic and theoretical mixture ratios is monitored in this system. This is
then computed in terms of “injection pulse duration” to automatically compensate for the difference between
the two ratios.
“Fuel trim” refers to the feedback compensation value compared against the basic injection duration. Fuel trim
includes short term fuel trim and long term fuel trim.
“Short term fuel trim” is the short-term fuel compensation used to maintain the mixture ratio at its theoretical
value. The signal from heated oxygen sensor 1 indicates whether the mixture ratio is RICH or LEAN compared
to the theoretical value. The signal then triggers a reduction in fuel volume if the mixture ratio is rich, and an
increase in fuel volume if it is lean.
“Long term fuel trim” is overall fuel compensation carried out long-term to compensate for continual deviation
of the short term fuel trim from the central value. Such deviation will occur due to individual engine differences,
wear over time and changes in the usage environment.
FUEL INJECTION TIMING
Two types of systems are used.
Sequential Multiport Fuel Injection System
Fuel is injected into each cylinder during each engine cycle according to the firing order. This system is used
when the engine is running.
Simultaneous Multiport Fuel Injection System
Fuel is injected simultaneously into all four cylinders twice each engine cycle. In other words, pulse signals of
the same width are simultaneously transmitted from the ECM.
The four injectors will then receive the signals two times for each engine cycle.
This system is used when the engine is being started and/or if the fail-safe system (CPU) is operating.
FUEL SHUT-OFF
Fuel to each cylinder is cut off during deceleration or operation of the engine at excessively high speeds.
SEF337W