NISSAN X-TRAIL 2001 Service Repair Manual

INJECTOR CIRCUIT
EC-391
[QR25(WITH EURO-OBD)]
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3.CHECK INJECTOR POWER SUPPLY CIRCUIT
1. Turn ignition switch “OFF”.
2. Disconnect injector harness connector.
3. Turn ignition switch “ON”.
4. Check voltage between injector terminal 1 and ground with
CONSULT-II or tester.
OK or NG
OK >> GO TO 5.
NG >> GO TO 4.
4.DETECT MALFUNCTIONING PART
Check the following.
●Harness connectors M61, F41
●Harness connectors F1, F101
●Fuse block (J/B) connector M1
●10A fuse
●Harness for open or short between injector and fuse
>> Repair harness or connectors.
5.CHECK INJECTOR OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch “OFF”.
2. Disconnect ECM harness connector.
3. Check harness continuity between injector terminal 2 and ECM terminals 101, 102, 103, 104.
Refer to Wiring Diagram.
4. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 7.
NG >> GO TO 6.
PBIB0510E
Voltage: Battery voltage
PBIB0582E
Continuity should exist.

EC-392
[QR25(WITH EURO-OBD)]
INJECTOR CIRCUIT
6. DETECT MALFUNCTIONING PART
Check the following.
●Harness connectors F1, F101
●Harness for open or short between injector and ECM
>> Repair open circuit or short to ground or short to power in harness or connectors.
7. CHECK INJECTOR
Refer to EC-392, "
Component Inspection" .
OK or NG
OK >> GO TO 8.
NG >> Replace injector.
8. CHECK INTERMITTENT INCIDENT
Refer to EC-115, "
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
>>INSPECTION END
Component InspectionEBS00MB9
INJECTOR
1. Disconnect injector harness connector.
2. Check resistance between terminals as shown in the figure.
Removal and InstallationEBS00MBA
INJECTOR
Refer to EM-32, "FUEL INJECTOR AND FUEL TUBE" . Resistance: 13.5 - 17.5Ω [at 20°C (68°F)]
PBIB0181E

VIAS
EC-393
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VIASPFP:14956
DescriptionEBS00NBJ
SYSTEM DESCRIPTION
When the engine is running at low or medium speed, the power valve is fully closed. Under this condition, the
effective suction port length is equivalent to the total length of the intake manifold collector's suction port
including the intake valve. This long suction port provides increased air intake which results in improved suc-
tion efficiency and higher torque generation.
The surge tank and one-way valve are provided. When engine is running at high speed, the ECM sends the
signal to the VIAS control solenoid valve. This signal introduces the intake manifold vacuum into the power
valve actuator and therefore opens the power valve to two suction passages together in the collector.
Under this condition, the effective port length is equivalent to the length of the suction port provided indepen-
dently for each cylinder. This shortened port length results in enhanced engine output with reduced suction
resistance under high speeds.
COMPONENT DESCRIPTION
Power Valve
The power valve is installed in intake manifold collector and used to
control the suction passage of the variable induction air control sys-
tem. It is set in the fully closed or fully opened position by the power
valve actuator operated by the vacuum stored in the surge tank. The
vacuum in the surge tank is controlled by the VIAS control solenoid
valve.
Sensor Input Signal to ECM ECM function Actuator
Mass air flow sensor Amount of intake air
VIAS control VIAS control solenoid valve Throttle position sensor Throttle position
Accelerator pedal position sensor Accelerator pedal position
Ignition switch Start signal
Crankshaft position sensor (POS)
Camshaft position sensor (PHASE)Engine speed
Engine coolant temperature sensor Engine coolant temperature
PBIB0843E
PBIB0946E

EC-394
[QR25(WITH EURO-OBD)]
VIAS
VIAS Control Solenoid Valve
The VIAS control solenoid valve cuts the intake manifold vacuum
signal for power valve control. It responds to ON/OFF signals from
the ECM. When the solenoid is off, the vacuum signal from the
intake manifold is cut. When the ECM sends an ON signal the coil
pulls the plunger downward and feeds the vacuum signal to the
power valve actuator.
CONSULT-II Reference Value in Data Monitor ModeEBS00NBK
ECM Terminals and Reference ValueEBS00NBL
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.
PBIB0947E
MONITOR ITEM CONDITION SPECIFICATION
VIAS S/V
●Engine: After warming upIdle OFF
More than 5,000 rpm ON
TER-
MINAL
NO.WIRE
COLORITEM CONDITION DATA (DC Voltage)
25 GY/LVIAS control solenoid
valve[Engine is running]
●Idle speedBATTERY VOLTAGE
(11 - 14V)
[Engine is running]
●Engine speed is above 5,000 rpm0 - 1.0V

VIAS
EC-395
[QR25(WITH EURO-OBD)]
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EC
Wiring DiagramEBS00NBM
TBWA0159E

EC-396
[QR25(WITH EURO-OBD)]
VIAS
Diagnostic Procedure
EBS00NBN
1. CHECK OVERALL FUNCTION
With CONSULT-II
1. Start engine and warm it up to normal operating temperature.
2. Perform “VIAS SOL VALVE” in “ACTIVE TEST” mode with CON-
SULT-II.
3. Turn VIAS control solenoid valve “ON” and “OFF”, and make
sure that power valve actuator rod moves.
Without CONSULT-II
1. Start engine and warm it up to normal operating temperature.
2. Rev engine quickly up to above 5,000 rpm and make sure that
power valve actuator rod moves.
OK or NG
OK >>INSPECTION END
NG (With CONSULT-II) >>GO TO 2.
NG (Without CONSULT-II) >>GO TO 3.
PBIB0844E
PBIB0949E
PBIB0949E

VIAS
EC-397
[QR25(WITH EURO-OBD)]
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2.CHECK VACUUM EXISTENCE
With CONSULT-II
1. Stop engine and disconnect vacuum hose connected to power valve actuator.
2. Start engine and let it idle.
3. Perform “VIAS SOL VALVE” in “ACTIVE TEST” mode with CON-
SULT-II.
4. Turn VIAS control solenoid valve “ON” and “OFF”, and check
vacuum existence under the following conditions.
OK or NG
OK >> Repair or replace power valve actuator.
NG >> GO TO 4.
3.CHECK VACUUM EXISTENCE
Without CONSULT-II
1. Stop engine and disconnect vacuum hose connected to power valve actuator.
2. Disconnect VIAS control solenoid valve harness connector.
3. Start engine and let it idle.
4. Apply 12V of direct current between VIAS control solenoid valve
terminals 1 and 2.
5. Check vacuum existence under the following conditions.
OK or NG
OK >> Repair or replace power valve actuator.
NG >> GO TO 4.
4.CHECK VACUUM HOSE
1. Stop engine.
2. Check hoses and tubes between intake manifold and power
valve actuator for crack, clogging, improper connection or dis-
connection. Refer to EC-32, "
Vacuum Hose Drawing" .
OK or NG
OK >> GO TO 5.
NG >> Repair hoses or tubes.
VIAS SOL VALVE Vacuum
ON Should exist.
OFF Should not exist.
PBIB0844E
Condition Vacuum
12V direct current supply Should exist.
No supply Should not exist.
PBIB0845E
SEF109L

EC-398
[QR25(WITH EURO-OBD)]
VIAS
5. CHECK VACUUM TANK
Refer to EC-399, "
Component Inspection" .
OK or NG
OK >> GO TO 6.
NG >> Replace vacuum tank.
6. CHECK VIAS CONTROL SOLENOID VALVE POWER SUPPLY CIRCUIT
1. Turn ignition switch “ON”.
2. Disconnect VIAS control solenoid valve harness connector.
3. Turn ignition switch “ON”.
4. Check voltage between VIAS control solenoid valve terminal 1
and ground with CONSULT-II or tester.
OK or NG
OK >> GO TO 8.
NG >> GO TO 7.
7. DETECT MALFUNCTIONING PART
Check the following.
●Harness connectors E60, F36
●Fuse block (J/B) connector E103
●10A fuse
●Harness continuity between fuse and VIAS control solenoid valve
>> Repair harness or connectors.
8. CHECK VIAS CONTROL SOLENOID VALVE OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch “OFF”.
2. Disconnect ECM harness connector.
3. Check harness continuity between ECM terminal 25 and VIAS control solenoid valve terminal 2. Refer to
Wiring Diagram.
4. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 9.
NG >> Repair open circuit or short to ground or short to power in harness or connectors.
PBIB0947E
Voltage: Battery voltage
PBIB0173E
Continuity should exist.

VIAS
EC-399
[QR25(WITH EURO-OBD)]
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EC
9.CHECK VIAS CONTROL SOLENOID VALVE
Refer to EC-399, "
Component Inspection" .
OK or NG
OK >> GO TO 10.
NG >> Replace VIAS control solenoid valve.
10.CHECK INTERMITTENT INCIDENT
Refer to EC-115, "
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
>>INSPECTION END
Component InspectionEBS00NBO
VIAS CONTROL SOLENOID VALVE
With CONSULT-II
1. Reconnect harness connectors disconnected.
2. Turn ignition switch ON.
3. Perform “VIAS SOL VALVE” in “ACTIVE TEST” mode.
4. Check air passage continuity and operation delay time under the
following conditions.
Operation takes less than 1 second.
Without CONSULT-II
Check air passage continuity and operation delay time under the fol-
lowing conditions.
Operation takes less than 1 second.
VACUUM TANK
1. Disconnect vacuum hose connected to vacuum tank.
2. Connect a vacuum pump to the port A of vacuum pump.
3. Apply vacuum and make sure that vacuum exists at the port B .
Condition
VIAS SOL VALVEAir passage continuity
between A and BAir passage continuity
between A and C
ON Yes No
OFF No Yes
PBIB0177E
ConditionAir passage continuity
between A and BAir passage continuity
between A and C
12V direct current supply
between terminals 1 and 2Ye s N o
No supply No Yes
MEC488B
PBIB0846E

EC-400
[QR25(WITH EURO-OBD)]
VIAS
Removal and Installation
EBS00NBP
VIAS CONTROL SOLENOID VALVE
Refer to EM-16, "INTAKE MANIFOLD" .