engine NISSAN X-TRAIL 2003 Service Repair Manual

EC-846
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REFRIGERANT PRESSURE SENSOR

2. CHECK REFRIGERANT PRESSURE SENSOR POWER SUPPLY CIRCUIT
1. Turn A/C switch and blower switch OFF.
2. Stop engine.
3. Disconnect refrigerant pressure sensor harness connector.
4. Turn ignition switch ON.
5. Check voltage between refrigerant pressure sensor terminal 3
and ground with CONSULT-II or tester.
OK or NG
OK >> GO TO 4.
NG >> GO TO 3.
3. DETECT MALFUNCTIONING PART
Check the following.

Harness connectors E61, F38

Harness for open or short between refrigerant pressure sensor and ECM
>> Repair open circuit or short to ground or short to power in harness or connectors.
4. CHECK REFRIGERANT PRESSURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between refrigerant pressure sensor terminal 1 and ECM terminal 57.
Refer to Wiring Diagram.
4. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 6.
NG >> GO TO 5.
5. DETECT MALFUNCTIONING PART
Check the following.

Harness connectors E61, F38

Harness for open or short between refrigerant pressure sensor and ECM
>> Repair open circuit or short to ground or short to power in harness or connectors.
PBIB0503E
Voltage: Approximately 5V
SEF479Y
Continuity should exist.

EC-850
[QR (WITHOUT EURO-OBD)]
ELECTRICAL LOAD SIGNAL

Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.
TERMI-
NAL
NO.WIRE
COLORITEM CONDITION DATA (DC Voltage)
84 L/YElectrical load signal
(Headlamp signal)[Ignition switch: ON]

Lighting switch: 2nd positionBATTERY VOLTAGE
(11 - 14V)
[Ignition switch: ON]

Lighting switch: OFFApproximately 0V
96 LG/B Heater fan switch[Engine is running]

Heater fan switch: ONApproximately 0V
[Engine is running]

Heater fan switch: OFFBATTERY VOLTAGE
(11 - 14V)

EC-854
[QR (WITHOUT EURO-OBD)]
ELECTRICAL LOAD SIGNAL

Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.
TERMI-
NAL
NO.WIRE
COLORITEM CONDITION DATA (DC Voltage)
84 L/YElectrical load signal
(Headlamp signal)[Ignition switch: ON]

Lighting switch: 2nd positionBATTERY VOLTAGE
(11 - 14V)
[Ignition switch: ON]

Lighting switch: OFFApproximately 0V
96 LG/B Heater fan switch[Engine is running]

Heater fan switch: ONApproximately 0V
[Engine is running]

Heater fan switch: OFFBATTERY VOLTAGE
(11 - 14V)

EC-858
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ELECTRICAL LOAD SIGNAL

8. CHECK HEADLAMP FUNCTION
1. Start engine.
2. Turn the lighting switch ON at 2nd position.
3. Check that headlamps are illuminated.
OK or NG
OK >> GO TO 9.
NG >> Refer to LT- 4 , "
HEADLAMP" or LT- 2 0 , "HEADLAMP - DAYTIME LIGHT SYSTEM -" .
9. CHECK HEADLAMP INPUT SIGNAL CIRCUIT FOR OPEN OR SHORT
1. Stop engine.
2. Disconnect ECM harness connector.
3. Disconnect lighting switch harness connectors.
4. Check harness continuity between lighting switch terminal 9, 10 and ECM terminal 84 under the following
conditions.
5. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 16.
NG >> GO TO 10.
10. DETECT MALFUNCTIONING PART
Check the following.

Harness connectors E106, M14 (LHD models)

Harness connectors E105, M13 (RHD models)

Diode E123

Diode E124

Harness for open and short between lighting switch and ECM
>> Repair open circuit or short to ground or short to power in harness or connectors.
Condition Continuity
1 Should exist
2 Should not exist
PBIB1994E

ELECTRICAL LOAD SIGNAL
EC-859
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11 . CHECK REAR WINDOW DEFOGGER FUNCTION
1. Start engine.
2. Turn ON the rear window defogger switch.
3. Check the rear windshield. Is the rear windshield heated up?
Ye s o r N o
Ye s > > G O T O 1 2 .
No >> Refer to GW-17, "
REAR WINDOW DEFOGGER" .
12. CHECK REAR WINDOW DEFOGGER INPUT SIGNAL CIRCUIT FOR OPEN OR SHORT
1. Stop engine.
2. Disconnect ECM harness connector.
3. Disconnect rear window defogger relay.
4. Check harness continuity between rear window defogger relay 3 (without door mirror defogger), 5 (with
door mirror defogger) and ECM terminal 93.
Refer to Wiring Diagram.
5. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 16.
NG >> GO TO 13.
13. DETECT MALFUNCTIONING PART
Check the following.

Harness connectors B1, M17

Harness for open and short between rear window defogger relay and ECM
>> Repair open circuit or short to ground or short to power in harness or connectors.
14. CHECK HEATER FAN CONTROL FUNCTION
1. Start engine.
2. Turn ON the fan control switch.
3. Check the blower fan motor. Does the blower fan motor activate?
Ye s o r N o
Ye s > > G O T O 1 5 .
No >> Refer to AT C - 3 4 , "
TROUBLE DIAGNOSIS" or MTC-3, "TROUBLE DIAGNOSIS" .
15. 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 A/C AUTO AMP. terminal 19 and ECM terminal 96.
Refer to Wiring Diagram.
5. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 16.
NG >> Repair open circuit or short to ground or short to power in harness or connectors.Continuity should exist.
Continuity should exist.

EVAPORATIVE EMISSION SYSTEM
EC-865
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EVAPORATIVE EMISSION SYSTEMPFP:14950
DescriptionEBS01154
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

EC-866
[QR (WITHOUT EURO-OBD)]
EVAPORATIVE EMISSION SYSTEM

EVAPORATIVE EMISSION LINE DRAWING
QR20DE Engine Models
PBIB0490E

EVAPORATIVE EMISSION SYSTEM
EC-867
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QR25DE Engine Models
PBIB1998E

EC-870
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POSITIVE CRANKCASE VENTILATION

POSITIVE CRANKCASE VENTILATIONPFP:11810
DescriptionEBS01156
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 InspectionEBS01157
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
PBIB1588E
PBIB1589E

EC-872
[QR (WITHOUT EURO-OBD)]
SERVICE DATA AND SPECIFICATIONS (SDS)

SERVICE DATA AND SPECIFICATIONS (SDS)PFP:00030
Fuel PressureEBS01158
Idle Speed and Ignition TimingEBS01159
*: Under the following conditions:

Air conditioner switch: OFF

Electric load: OFF (Lights, heater fan & rear window defogger)

Steering wheel: Kept in straight-ahead position
Mass Air Flow SensorEBS0115B
*: Engine is warmed up to normal operating temperature and running under no-load.
Intake Air Temperature SensorEBS0115C
Engine Coolant Temperature SensorEBS0115D
Heated Oxygen Sensor 1 HeaterEBS0115E
Heated Oxygen sensor 2 HeaterEBS0115F
Crankshaft Position Sensor (POS)EBS0115G
Refer to EC-644, "Component Inspection" .
Fuel pressure at idle
Approximately 350 kPa (3.5bar, 3.57kg/cm2 , 51psi)
Target idle speedQR20DEM/T No load* (in Neutral position) 650±50 rpm
A/T No load* (in P or N position)
700±50 rpm
QR25DEM/T No load* (in Neutral position)
A/T No load* (in P or N position)
Air conditioner: ONQR20DEM/T In Neutral position
725 rpm or more
A/T In P or N position
QR25DEM/T In Neutral position 750 rpm or more
A/T In P or N position 700 rpm or more
Ignition timingQR20DEM/T In Neutral position
15°±5° BTDC A/T In P or N position
QR25DEM/T In Neutral position
A/T In P or N position
Supply voltageBattery voltage (11 - 14V)
Output voltage at idle0.7 - 1.1*V (QR20DE)
0.8 - 1.2*V (QR25DE)
Temperature °C (°F) Resistance kΩ
25 (77)1.94 - 2.06
80 (176)0.295 - 0.349
Temperature °C (°F) Resistance kΩ
20 (68)2.1 - 2.9
50 (122)0.68 - 1.00
90 (194)0.236 - 0.260
Resistance [at 25°C (77°F)] 3.3 - 4.0Ω
Resistance [at 25°C (77°F)] 5.0 - 7.0Ω