Nissan Murano Z50 (2003 year). Manual — part 118
IGNITION SIGNAL
EC-607
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Revision; 2004 April
2003 Murano
Component Inspection
ABS004OC
IGNITION COIL WITH POWER TRANSISTOR
1.
Turn ignition switch “OFF”.
2.
Disconnect ignition coil harness connector.
3.
Check resistance between ignition coil terminals as follows.
CONDENSER
1.
Turn ignition switch “OFF”.
2.
Disconnect condenser harness connector.
3.
Check resistance between condenser terminals 1 and 2.
Removal and Installation
ABS004OD
IGNITION COIL WITH POWER TRANSISTOR
Refer to
Terminal No. (Polarity)
Resistance
Ω
[at 25
°
C (77
°
F)]
1 and 2
Except 0 or
∞
1 and 3
Except 0
2 and 3
PBIB0847E
Resistance
Above 1 M
Ω
at 25
°
C (77
°
F)
PBIB0794E
EC-608
VIAS
Revision; 2004 April
2003 Murano
VIAS
PFP:14956
Description
ABS004S6
SYSTEM DESCRIPTION
*: ECM determines the start signal status by the signals of engine speed and battery voltage.
When the engine is running at medium speed, the ECM sends the “ON” signal to the VIAS control solenoid
valve. This signal introduces the intake manifold vacuum into the power valve actuator and therefore closes
the power valve.
Under this condition, the effective intake manifold length is equivalent to the total length of passage A and pas-
sage B. This long intake manifold provides increased amount of intake air, which results in improved suction
efficiency and higher torque.
When engine is running at low or high speed, the ECM sends the “OFF” signal to the VIAS control solenoid
valve and the power valve is opened.
Under this condition, the effective intake manifold length is equivalent to the length of passage B. This short-
ened intake manifold length results in enhanced engine output due to 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
Crankshaft position sensor (POS)
Camshaft position sensor (PHASE)
Engine speed*
VIAS control
VIAS control solenoid valve
Mass air flow sensor
Amount of intake air
Engine coolant temperature sensor
Engine coolant temperature
Throttle position sensor
Throttle position
Accelerator pedal position sensor
Accelerator pedal position
Battery
Battery voltage*
PBIB1822E
PBIB1369E
VIAS
EC-609
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Revision; 2004 April
2003 Murano
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 Mode
ABS004VR
Specification data are reference values.
PBIB1369E
MONITOR ITEM
CONDITION
SPECIFICATION
VIAS S/V
●
Engine: After warming up
1,800 - 3,600 rpm
ON
Except above conditions
OFF
EC-610
VIAS
Revision; 2004 April
2003 Murano
Wiring Diagram
ABS004S8
TBWA0403E
VIAS
EC-611
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Revision; 2004 April
2003 Murano
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.
TER-
MINAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
29
G/Y
VIAS control solenoid valve
[Engine is running]
●
Idle speed
BATTERY VOLTAGE
(11 - 14V)
[Engine is running]
●
Engine speed is between 1,800 and 3,600
rpm.
0 - 1.0V
111
W/B
ECM relay
(Self shut-off)
[Engine is running]
[Ignition switch “OFF”]
●
For a few seconds after turning ignition
switch “OFF”
0 - 1.5V
[Ignition switch “OFF”]
●
A few seconds passed after turning ignition
switch “OFF”
BATTERY VOLTAGE
(11 - 14V)
119
120
R/B
R/B
Power supply for ECM
[Ignition switch “ON”]
BATTERY VOLTAGE
(11 - 14V)
EC-612
VIAS
Revision; 2004 April
2003 Murano
Diagnostic Procedure
ABS004S9
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
PBIB1380E
PBIB1380E
VIAS
EC-613
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Revision; 2004 April
2003 Murano
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 CONSULT-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
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-614
VIAS
Revision; 2004 April
2003 Murano
5.
CHECK VACUUM TANK
Refer to
EC-615, "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 “OFF”.
2.
Disconnect VIAS control solenoid valve harness connector.
3.
Turn ignition switch “ON”.
4.
Check voltage between 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 E110, M7
●
Harness connectors M82, F102
●
IPDM E/R connector E8
●
Harness for open or short between VIAS control solenoid valve and IPDM E/R
●
Harness for open or short between VIAS control solenoid valve and ECM
>> 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 29 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.
PBIB1369E
Voltage: Battery voltage
PBIB0173E
Continuity should exist.
VIAS
EC-615
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Revision; 2004 April
2003 Murano
9.
CHECK VIAS CONTROL SOLENOID VALVE
Refer to
EC-615, "Component Inspection"
OK or NG
OK
>> GO TO 10.
NG
>> Replace VIAS control solenoid valve.
10.
CHECK INTERMITTENT INCIDENT
Refer to
EC-151, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"
>> INSPECTION END
Component Inspection
ABS004SA
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 center port of vacuum tank.
3.
Apply vacuum and make sure that vacuum exists at the other
port.
Condition
VIAS SOL VALVE
Air passage continuity
between A and B
Air passage continuity
between A and C
ON
Yes
No
OFF
No
Yes
PBIB0177E
Condition
Air passage continuity
between A and B
Air passage continuity
between A and C
12V direct current supply
between terminals 1 and 2
Yes
No
No supply
No
Yes
MEC488B
PBIB0846E
EC-616
VIAS
Revision; 2004 April
2003 Murano
Removal and Installation
ABS004SB
VIAS CONTROL SOLENOID VALVE
Refer to
INJECTOR CIRCUIT
EC-617
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Revision; 2004 April
2003 Murano
INJECTOR CIRCUIT
PFP:16600
Component Description
ABS004OE
The fuel injector is a small, precise solenoid valve. When the ECM
supplies a ground to the injector circuit, the coil in the injector is
energized. The energized coil pulls the needle valve back and allows
fuel to flow through the injector into the intake manifold. The amount
of fuel injected depends upon the injection pulse duration. Pulse
duration is the length of time the injector remains open. The ECM
controls the injection pulse duration based on engine fuel needs.
CONSULT-II Reference Value in Data Monitor Mode
ABS004OF
Specification data are reference values.
SEF375Z
MONITOR ITEM
CONDITION
SPECIFICATION
B/FUEL SCHDL
●
Engine: After warming up
●
Shift lever: N
●
Air conditioner switch: OFF
●
No-load
Idle
2.5 - 3.5 msec
2,000 rpm
2.5 - 4.0 msec
INJ PULSE-B1
INJ PULSE-B2
●
Engine: After warming up
●
Shift lever: N
●
Air conditioner switch: OFF
●
No-load
Idle
2.0 - 3.0 msec
2,000 rpm
1.9 - 2.9 msec
EC-618
INJECTOR CIRCUIT
Revision; 2004 April
2003 Murano
Wiring Diagram
ABS004OG
TBWA0446E
INJECTOR CIRCUIT
EC-619
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EC
Revision; 2004 April
2003 Murano
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.
: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)
Diagnostic Procedure
ABS004OH
1.
INSPECTION START
Turn ignition switch to “START”.
Is any cylinder ignited?
Yes or No
Yes
>> GO TO 2.
No
>> GO TO 3.
TER-
MINAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
21
22
23
L/W
R/Y
R/B
Injector No. 5
Injector No. 3
Injector No. 1
[Engine is running]
●
Warm-up condition
●
Idle speed
BATTERY VOLTAGE
(11 - 14V)
[Engine is running]
●
Warm-up condition
●
Engine speed is 2,000 rpm.
BATTERY VOLTAGE
(11 - 14V)
40
41
42
R/G
L/R
R/W
Injector No. 6
Injector No. 4
Injector No. 2
[Engine is running]
●
Warm-up condition
●
Idle speed
BATTERY VOLTAGE
(11 - 14V)
[Engine is running]
●
Warm-up condition
●
Engine speed is 2,000 rpm
BATTERY VOLTAGE
(11 - 14V)
SEC984C
SEC985C
SEC984C
SEC985C
EC-620
INJECTOR CIRCUIT
Revision; 2004 April
2003 Murano
2.
CHECK OVERALL FUNCTION
With CONSULT-II
1.
Start engine.
2.
Perform “POWER BALANCE” in “ACTIVE TEST” mode with
CONSULT-II.
3.
Make sure that each circuit produces a momentary engine
speed drop.
Without CONSULT-II
1.
Start engine.
2.
Listen to each injector operating sound.
Clicking noise should be heard.
OK or NG
OK
>> INSPECTION END
NG
>> GO TO 3.
PBIB0133E
MEC703B
INJECTOR CIRCUIT
EC-621
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Revision; 2004 April
2003 Murano
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 M82, F102
●
Harness connectors F29, F201
●
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 21, 22, 23, 40, 41, 42.
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.
Voltage: Battery voltage
PBIB1358E
PBIB0582E
Continuity should exist.
EC-622
INJECTOR CIRCUIT
Revision; 2004 April
2003 Murano
6.
DETECT MALFUNCTIONING PART
Check the following.
●
Harness connectors F201, F29
●
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-622, "Component Inspection"
OK or NG
OK
>> GO TO 8.
NG
>> Replace injector.
8.
CHECK INTERMITTENT INCIDENT
Refer to
EC-151, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"
.
>> INSPECTION END
Component Inspection
ABS004OI
INJECTOR
1.
Disconnect injector harness connector.
2.
Check resistance between terminals as shown in the figure.
Removal and Installation
ABS004OJ
INJECTOR
Refer to
EM-38, "FUEL INJECTOR AND FUEL TUBE"
Resistance: 13.5 - 17.5
Ω
[at 20
°
C (68
°
F)]
PBIB0181E
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