engine NISSAN X-TRAIL 2003 Electronic Repair Manual

EC-370
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ELECTRICAL LOAD SIGNAL
17.CHECK HEATER FAN SIGNAL CIRCUIT FOR OPEN OR SHORT
1. Stop engine.
2. Disconnect ECM harness connector.
3. Disconnect A/C AUTO AMP. harness connector.
4. Check harness continuity between ECM terminal 55 and A/C AUTO AMP. terminal 19.
Refer to Wiring Diagram.
5. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 19.
NG >> GO TO 18.
18.DETECT MALFUNCTIONING PART
Check the following.
lHarness connectors M62, F42
lHarness for open and short between ECM and A/C AUTO AMP.
>> Repair open circuit or short to ground or short to power in harness or connectors.
19.CHECK INTERMITTENT INCIDENT
PerformEC-107, "
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT".
>>INSPECTION END Continuity should exist.

EC-372
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EVAPORATIVE EMISSION SYSTEM
EVAPORATIVE EMISSION SYSTEM
PFP:14950
DescriptionEBS00BE2
SYSTEM DESCRIPTION
The evaporative emission system is used to reduce hydrocarbons emitted into the atmosphere from the fuel
system. This reduction of hydrocarbons is accomplished by activated charcoals in the EVAP canister.
The fuel vapor in the sealed fuel tank is led into the EVAP canister which contains activated carbon and the
vapor is stored there when the engine is not operating or when refueling to the fuel tank.
The vapor in the EVAP canister is purged by the air through the purge line to the intake manifold when the
engine is operating. EVAP canister purge volume control solenoid valve is controlled by ECM. When the
engine operates, the flow rate of vapor controlled by EVAP canister purge volume control solenoid valve is
proportionally regulated as the air flow increases.
EVAP canister purge volume control solenoid valve also shuts off the vapor purge line during decelerating and
idling.
PBIB0491E

POSITIVE CRANKCASE VENTILATION
EC-375
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POSITIVE CRANKCASE VENTILATIONPFP:11810
DescriptionEBS00BE4
SYSTEM DESCRIPTION
This system returns blow-by gas to the intake manifold.
The positive crankcase ventilation (PCV) valve is provided to conduct crankcase blow-by gas to the intake
manifold. During partial throttle operation of the engine, the intake manifold sucks the blow-by gas through the
PCV valve. Normally, the capacity of the valve is sufficient to handle any blow-by and a small amount of venti-
lating air. The ventilating air is then drawn from the air inlet tubes into the crankcase. In this process the air
passes through the hose connecting air inlet tubes to rocker cover. Under full-throttle condition, the manifold
vacuum is insufficient to draw the blow-by flow through the valve. The flow goes through the hose connection
in the reverse direction.
On vehicles with an excessively high blow-by, the valve does not
meet the requirement. This is because some of the flow will go
through the hose connection to the air inlet tubes under all condi-
tions.
Component InspectionEBS00BE5
PCV (POSITIVE CRANKCASE VENTILATION) VALVE
With engine running at idle, remove PCV valve from rocker cover. A
properly working valve makes a hissing noise as air passes through
it. A strong vacuum should be felt immediately when a finger is
placed over valve inlet.
PBIB0492E
SEF559A
SEC137A

SERVICE DATA AND SPECIFICATIONS (SDS)
EC-377
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SERVICE DATA AND SPECIFICATIONS (SDS)PFP:00030
Fuel PressureEBS00BE6
Idle Speed and Ignition TimingEBS00BE7
*1: Under the following conditions:
lAir conditioner switch: OFF
lElectric load: OFF (Lights, heater fan & rear window defogger)
lSteering wheel: Kept in straight-ahead position
Calculated Load ValueEBS00BE8
Mass Air Flow SensorEBS00BE9
*: Engine is warmed up to normal operating temperature and running under no-load.
Intake Air Temperature SensorEBS00BEA
Engine Coolant Temperature SensorEBS00BEB
Heated Oxygen Sensor 1 HeaterEBS00BEC
Heated Oxygen sensor 2 HeaterEBS00BED
Crankshaft Position Sensor (POS)EBS00BEE
Refer toEC-221, "Component Inspection".
Camshaft Position Sensor (PHASE)EBS00BEF
Refer toEC-228, "Component Inspection".
Fuel pressure at idle kPa (bar, kg/cm2,psi)Approximately 350 (3.5, 3.7, 51)
Target idle speed
No-load*1 (in “P” or N” position)A/T: 700±50 rpm
M/T: 650±50 rpm
Air conditioner: ON In “P” or N” position 725 rpm or more
Ignition timingIn“P”orN”position AT:16°±5°BTDC
MT: 14°±5°BTDC
Calculated load value % (Using CONSULT-II or GST)
At idle10 - 35
At 2,500 rpm10 - 35
Supply voltageBattery voltage (11 - 14V)
Output voltage at idle1.1 - 1.5*V
Mass air flow (Using CONSULT-II or GST)1.4 - 4.0 g·m/sec at idle*
4.0 - 10.0 g·m/sec at 2,500 rpm*
Temperature°C(°F) Resistance kW
25 (77)1.9 - 2.1
80 (176)0.31 - 0.37
Temperature°C(°F) Resistance kW
20 (68) 2.1 - 2.9
50 (122) 0.68 - 1.00
90 (194) 0.236 - 0.260
Resistance [at 25°C(77°F)] 2.3 - 4.3W
Resistance [at 25°C(77°F)] 2.3 - 4.3W

INDEX FOR DTC
EC-379
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[QR (WITHOUT EURO-OBD)]INDEX FOR DTCPFP:00024
Alphabetical IndexEBS00BEJ
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-460
.
*1: 1st trip DTC No. is the same as DTC No.
*2: In Diagnostic Test Mode II (Self-diagnostic results).
*3: When engine is running.
*4: When the fail-safe operation occurs, the MI illuminates.
*5: The trouble shooting for this DTC needs CONSULT-II.
*6: Except for M/T models without ESP/TCS/ABS system.
*7: For M/T models with ESP/TCS/ABS system.Items
(CONSULT-II screen terms)DTC*1
Reference page
CONSULT-II ECM*2
APP SEN/CIRCUIT P0121 0121EC-484
BRAKE SW/CIRCUIT P1805 1805EC-562
CAN COMM CIRCUIT*6 U1000 1000*5EC-460
CKP SEN/CIRCUIT P0335 0335EC-501
CMP SEN/CIRCUIT P0340 0340EC-507
ECM P0605 0605EC-523
ECM BACK UP/CIRC P1065 1065EC-530
ECT SEN/CIRCUIT*4 P0117 0117EC-470
ECT SEN/CIRCUIT*4 P0118 0118EC-470
ENG OVER TEMP P1217 1217EC-548
E T C A C T R P 11 2 1 11 2 1EC-534
ETC FUNCTION/CIRC P1122 1122EC-536
ETC MOT RLY/CIRC P1123 1123EC-542
HO2S1 (B1) P0134 0134EC-490
KNOCK SEN/CIRC-B1 P0327 0327EC-496
KNOCK SEN/CIRC-B1 P0328 0328EC-496
MAF SEN/CIRCUIT*4 P0102 0102EC-463
MAF SEN/CIRCUIT*4 P0103 0103EC-463
MIL/CIRC P0650 0650EC-526
NATS MALFUNCTION P1610 - P1615 1610 - 1615EC-403
NO DTC IS DETECTED.
FURTHER TESTING
MAY BE REQUIRED.No DTC Flashing*3EC-404
NO DTC IS DETECTED.
FURTHER TESTING
MAY BE REQUIRED.P0000 0000 —
PW ST P SEN/CIRC P0550 0550EC-518
TCS/CIRC*7 P1212 1212EC-547
THRTL POS SEN/CIRC*4 P0120 0120EC-475
VEH SPEED SEN/CIRC P0500 0500EC-513

EC-380
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INDEX FOR DTC
DTC No. Index
EBS00BEK
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-460
.
*1: 1st trip DTC No. is the same as DTC No.
*2: In Diagnostic Test Mode II (Self-diagnostic results).
*3: When engine is running.
*4: When the fail-safe operation occurs, the MI illuminates.
*5: The trouble shooting for this DTC needs CONSULT-II.
*6: Except for M/T models without ESP/TCS/ABS system.
*7: For M/T models with ESP/TCS/ABS system.DTC*1
Items
(CONSULT-II screen terms)Reference page
CONSULT-II ECM*2
No DTC Flashing*3NO DTC IS DETECTED.
FURTHER TESTING
MAYBEREQUIRED.EC-404
U1000 1000*5 CAN COMM CIRCUIT*6EC-460
P0000 0000NO DTC IS DETECTED.
FURTHER TESTING
MAYBEREQUIRED.—
P0102 0102 MAF SEN/CIRCUIT*4EC-463
P0103 0103 MAF SEN/CIRCUIT*4EC-463
P0117 0117 ECT SEN/CIRCUIT*4EC-470
P0118 0118 ECT SEN/CIRCUIT*4EC-470
P0120 0120 THRTL POS SEN/CIRC*4EC-475
P0121 0121 APP SEN/CIRCUITEC-484
P0134 0134 HO2S1 (B1)EC-490
P0327 0327 KNOCK SEN/CIRC-B1EC-496
P0328 0328 KNOCK SEN/CIRC-B1EC-496
P0335 0335 CKP SEN/CIRCUITEC-501
P0340 0340 CMP SEN/CIRCUITEC-507
P0500 0500 VEH SPEED SEN/CIRCEC-513
P0550 0550 PW ST P SEN/CIRCEC-518
P0605 0605 ECMEC-523
P0650 0650 MIL/CIRCEC-526
P1065 1065 ECM BACK UP/CIRCEC-530
P1121 1121 ETC ACTREC-534
P1122 1122 ETC FUNCTION/CIRCEC-536
P1123 1123 ETC MOT RLY/CIRCEC-542
P1212 1212 TCS/CIRC*7EC-547
P1217 1217 ENG OVER TEMPEC-548
P1610 - P1615 1610 - 1615 NATS MALFUNCTIONEC-403
P1805 1805 BRAKE SW/CIRCUITEC-562

PRECAUTIONS
EC-381
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PRECAUTIONSPFP:00001
Precautions for Supplemental Restraint System (SRS) “AIR BAG” and “SEAT
BELT PRE-TENSIONER”
EBS00BEL
The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER”, used along
with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain
types of collision. Information necessary to service the system safely is included in the SRS and SB section of
this Service Manual.
WA RN ING:
lTo 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 per-
formed by an authorized NISSAN/INFINITI dealer.
lImproper 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 SRS section.
lDo not use electrical test equipment on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harnesses can be identified by yellow harness connector.
On Board Diagnostic (OBD) System of Engine and A/TEBS00BEM
The ECM has an on board diagnostic system. It will light up the malfunction indicator (MI) to warn the driver of
a malfunction causing emission deterioration.
CAUTION:
lBe 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 MI to light up.
lBe sure to connect and lock the connectors securely after work. A loose (unlocked) connector will
cause the MI to light up due to the open circuit. (Be sure the connector is free from water, grease,
dirt, bent terminals, etc.)
lCertain 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 toPG-70, "
HAR-
NESS CONNECTOR".
lBe sure to route and secure the harnesses properly after work. The interference of the harness
with a bracket, etc. may cause the MI to light up due to the short circuit.
lBe sure to connect rubber tubes properly after work. A misconnected or disconnected rubber tube
may cause the MI to light up due to the malfunction of the fuel injection system, etc.
lBe sure to erase the unnecessary malfunction information (repairs completed) from the ECM and
TCM (Transmission control module) before returning the vehicle to the customer.
PrecautionEBS00BEN
lAlways use a 12 volt battery as power source.
lDo not attempt to disconnect battery cables while engine is
running.
lBefore connecting or disconnecting the ECM harness con-
nector, turn ignition switch OFF and disconnect negative
battery terminal. Failure to do so may damage the ECM
because battery voltage is applied to ECM even if ignition
switch is turned off.
lBefore removing parts, turn ignition switch OFF and then
disconnect battery ground cable.
SEF289H

EC-382
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PRECAUTIONS
lDo not disassemble ECM.
lIf a battery terminal is disconnected, the memory will return
to the ECM value.
The ECM will now start to self-control at its initial value.
Engine operation can vary slightly when the terminal is dis-
connected. However, this is not an indication of a problem.
Do not replace parts because of a slight variation.
lWhen connecting ECM harness connector, fasten it
securely with a lever as far as it will go as shown at right.
lWhen connecting or disconnecting pin connectors into or
from ECM, take care not to damage pin terminals (bend or
break).
Make sure that there are not any bends or breaks on ECM
pin terminal, when connecting pin connectors.
lSecurely connect ECM harness connectors.
A poor connection can cause an extremely high (surge)
voltage to develop in coil and condenser, thus resulting in
damage to ICs.
lKeep engine control system harness at least 10 cm (4 in)
away from adjacent harness, to prevent engine control sys-
tem malfunctions due to receiving external noise, degraded
operation of ICs, etc.
lKeep engine control system parts and harness dry.
lBefore replacing ECM, perform “ECM Terminals and Refer-
ence Value” inspection and make sure ECM functions prop-
erly. Refer toEC-427
.
lHandle mass air flow sensor carefully to avoid damage.
lDo not disassemble mass air flow sensor.
lDo not clean mass air flow sensor with any type of deter-
gent.
lDo not disassemble electric throttle control actuator.
lEven a slight leak in the air intake system can cause seri-
ous problems.
lDo not shock or jar the camshaft position sensor (PHASE),
crankshaft position sensor (POS).
SEF707Y
SEF908W
PBIB0090E
MEF040D

EC-384
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PRECAUTIONS
lDo not depress accelerator pedal when starting.
lImmediately after starting, do not rev up engine unneces-
sarily.
lDo not rev up engine just prior to shutdown.
lWhen installing C.B. ham radio or a mobile phone, be sure
to observe the following as it may adversely affect elec-
tronic control systems depending on installation location.
–Keep the antenna as far as possible from the electronic
control units.
–Keep the antenna feeder line more than 20 cm (8 in) away
from the harness of electronic controls.
Do not let them run parallel for a long distance.
–Adjust the antenna and feeder line so that the standing-
wave radio can be kept smaller.
–Be sure to ground the radio to vehicle body.
Wiring Diagrams and Trouble DiagnosisEBS00BEO
When you read Wiring diagrams, refer to the following:
lGI-14, "How to Read Wiring Diagrams"
lPG-2, "POWER SUPPLY ROUTING"for power distribution circuit
When you perform trouble diagnosis, refer to the following:
lGI-11, "HOW TO FOLLOW TEST GROUPS IN TROUBLE DIAGNOSES"
lGI-24, "How to Perform Efficient Diagnosis for an Electrical Incident"
SEF709Y
SEF708Y

PREPARATION
EC-385
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PREPARATIONPFP:00002
Special Service ToolsEBS00BEP
The actual shapes of Kent-Moore tools may differ from those of special service tools illustrated here.
Commercial Service ToolsEBS00BEQ
Tool number
To o l n a m eDescription
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