Nissan Murano Z50 (2005 year). Manual — part 118
IGNITION SIGNAL
EC-643
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Revision: 2005 August
2005 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)
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]
●
More than a few seconds after turning igni-
tion switch OFF
BATTERY VOLTAGE
(11 - 14V)
119
120
R/B
R/B
Power supply for ECM
[Ignition switch: ON]
BATTERY VOLTAGE
(11 - 14V)
EC-644
IGNITION SIGNAL
Revision: 2005 August
2005 Murano
TBWA0388E
IGNITION SIGNAL
EC-645
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Revision: 2005 August
2005 Murano
Specification data are reference values and are measured between each terminal and ground.
Pulse signal is measured by CONSULT-II.
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.)
TER-
MINAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
60
61
62
BR/R
L/R
Y/R
Ignition signal No. 5
Ignition signal No. 3
Ignition signal No. 1
[Engine is running]
●
Warm-up condition
●
Idle speed
NOTE:
The pulse cycle changes depending on rpm
at idle.
0 - 0.3V
[Engine is running]
●
Warm-up condition
●
Engine speed is 2,500 rpm.
0.1 - 0.6V
SEC986C
SEC987C
EC-646
IGNITION SIGNAL
Revision: 2005 August
2005 Murano
TBWA0389E
IGNITION SIGNAL
EC-647
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Revision: 2005 August
2005 Murano
Specification data are reference values and are measured between each terminal and ground.
Pulse signal is measured by CONSULT-II.
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
ABS004OB
1.
CHECK ENGINE START
Turn ignition switch OFF, and restart engine.
Is engine running?
Yes or No
Yes (With CONSULT-II)>>GO TO 2.
Yes (Without CONSULT-II)>>GO TO 3.
No
>> GO TO 4.
2.
CHECK OVERALL FUNCTION
With CONSULT-II
1.
Perform “POWER BALANCE” in “ACTIVE TEST” mode with
CONSULT-II.
2.
Make sure that each circuit produces a momentary engine
speed drop.
OK or NG
OK
>> INSPECTION END
NG
>> GO TO 10.
TER-
MINAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
79
80
81
GR/R
GR
G/R
Ignition signal No. 6
Ignition signal No. 4
Ignition signal No. 2
[Engine is running]
●
Warm-up condition
●
Idle speed
NOTE:
The pulse cycle changes depending on rpm
at idle.
0 - 0.3V
[Engine is running]
●
Warm-up condition
●
Engine speed is 2,500 rpm.
0.1 - 0.6V
SEC986C
SEC987C
PBIB0133E
EC-648
IGNITION SIGNAL
Revision: 2005 August
2005 Murano
3.
CHECK OVERALL FUNCTION
Without CONSULT-II
1.
Let engine idle.
2.
Read the voltage signal between ECM terminals 60, 61, 62, 79,
80, 81 and ground with an oscilloscope.
3.
Verify that the oscilloscope screen shows the signal wave as
shown below.
NOTE:
The pulse cycle changes depending on rpm at idle.
OK or NG
OK
>> INSPECTION END
NG
>> GO TO 10.
4.
CHECK IGNITION COIL POWER SUPPLY CIRCUIT-I
1.
Turn ignition switch OFF, wait at least 10 seconds and then turn ON.
2.
Check voltage between ECM terminals 119, 120 and ground
with CONSULT-II or tester.
OK or NG
OK
>> GO TO 5.
NG
>> Go to
EC-158, "POWER SUPPLY AND GROUND CIR-
.
PBIB1186E
SEC986C
Voltage: Battery voltage
MBIB0034E
IGNITION SIGNAL
EC-649
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Revision: 2005 August
2005 Murano
5.
CHECK IGNITION COIL POWER SUPPLY CIRCUIT-II
1.
Turn ignition switch OFF.
2.
Disconnect condenser harness connector.
3.
Turn ignition switch ON.
4.
Check voltage between condenser terminal 1 and ground with
CONSULT-II or tester.
OK or NG
OK
>> GO TO 8.
NG
>> GO TO 6.
6.
CHECK IGNITION COIL POWER SUPPLY CIRCUIT-III
1.
Turn ignition switch OFF.
2.
Disconnect IPDM E/R harness connector E7.
3.
Check harness continuity between IPDM E/R terminal 17 and condenser terminal 1.
Refer to Wiring Diagram.
4.
Also check harness for short to ground and short to power.
OK or NG
OK
EC-158, "POWER SUPPLY AND GROUND CIRCUIT"
NG
>> GO TO 7.
7.
DETECT MALFUNCTIONING PART
Check the following.
●
Harness connectors E19, F3
●
Harness for open or short between IPDM E/R and condenser
>> Repair open circuit or short to ground or short to power in harness or connectors.
PBIB1371E
Voltage: Battery voltage
PBIB0624E
Continuity should exist.
EC-650
IGNITION SIGNAL
Revision: 2005 August
2005 Murano
8.
CHECK CONDENSER GROUND CIRCUIT FOR OPEN AND SHORT
1.
Turn ignition switch OFF.
2.
Check harness continuity between condenser terminal 2 and ground.
Refer to Wiring Diagram.
3.
Also check harness for short to power.
OK or NG
OK
>> GO TO 9.
NG
>> Repair open circuit or short to power in harness or connectors.
9.
CHECK CONDENSER
Refer to
EC-652, "Component Inspection"
OK or NG
OK
>> GO TO 10.
NG
>> Replace condenser.
10.
CHECK IGNITION COIL POWER SUPPLY CIRCUIT-IV
1.
Turn ignition switch OFF.
2.
Reconnect all harness connectors disconnected.
3.
Disconnect ignition coil harness connector.
4.
Turn ignition switch ON.
5.
Check voltage between ignition coil terminal 3 and ground with
CONSULT-II or tester.
OK or NG
OK
>> GO TO 12.
NG
>> GO TO 11.
11.
DETECT MALFUNCTIONING PART
Check the following.
●
Harness connectors F32, F221
●
Harness for open or short between ignition coil and harness connector F3
>> Repair or replace harness or connectors.
Continuity should exist.
Voltage: Battery voltage
PBIB1370E
PBIB0138E
IGNITION SIGNAL
EC-651
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Revision: 2005 August
2005 Murano
12.
CHECK IGNITION COIL GROUND CIRCUIT FOR OPEN AND SHORT
1.
Turn ignition switch OFF.
2.
Check harness continuity between ignition coil terminal 2 and ground.
Refer to Wiring Diagram.
3.
Also check harness for short to power.
OK or NG
OK
>> GO TO 14.
NG
>> GO TO 13.
13.
DETECT MALFUNCTIONING PART
Check the following.
●
Harness connectors F221, F32
●
Harness for open or short between ignition coil and ground
>> Repair open circuit or short to power in harness or connectors.
14.
CHECK IGNITION COIL OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1.
Disconnect ECM harness connector.
2.
Check harness continuity between ECM terminals 60, 61, 62, 79, 80, 81 and ignition coil terminal 1.
Refer to Wiring Diagram.
3.
Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 16.
NG
>> GO TO 15.
15.
DETECT MALFUNCTIONING PART
Check the following.
●
Harness connectors F32, F221
●
Harness for open or short between ignition coil and ECM
>> Repair open circuit or short to ground or short to power in harness or connectors.
16.
CHECK IGNITION COIL WITH POWER TRANSISTOR
Refer to
EC-652, "Component Inspection"
OK or NG
OK
>> GO TO 17.
NG
>> Replace ignition coil with power transistor.
17.
CHECK INTERMITTENT INCIDENT
Refer to
EC-157, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"
OK or NG
OK
>> Replace IPDM E/R.
NG
>> Repair open circuit or short to ground or short to power in harness connectors.
Continuity should exist.
Continuity should exist.
EC-652
IGNITION SIGNAL
Revision: 2005 August
2005 Murano
Component Inspection
ABS004OC
IGNITION COIL WITH POWER TRANSISTOR
CAUTION:
Do the following procedure in the place where ventilation is good without the combustible.
1.
Turn ignition switch OFF.
2.
Disconnect ignition coil harness connector.
3.
Check resistance between ignition coil terminals as follows.
4.
If NG, Replace ignition coil with power transistor.
If OK, go to next step.
5.
Turn ignition switch OFF.
6.
Reconnect all harness connectors disconnected.
7.
Remove fuel pump fuse in IPDM E/R to release fuel pressure.
NOTE:
Do not use CONSULT-II to release fuel pressure, or fuel pres-
sure applies again during the following procedure.
8.
Start engine.
9.
After engine stalls, crank it two or three times to release all fuel
pressure.
10. Turn ignition switch OFF.
11. Remove ignition coil harness connectors to avoid the electrical
discharge from the ignition coils.
12. Remove ignition coil and spark plug of the cylinder to be
checked.
13. Crank engine for 5 seconds or more to remove combustion gas in the cylinder.
14. Connect spark plug and harness connector to ignition coil.
15. Fix ignition coil using a rope etc. with gap of 13 - 17 mm
between the edge of the spark plug and grounded metal portion
as shown in the figure.
16. Crank engine for about 3 seconds, and check whether spark is
generated between the spark plug and the grounded part.
CAUTION:
●
Do not approach to the spark plug and the ignition coil
within 50cm. Be careful not to get an electrical shock
while checking, because the electrical discharge voltage
becomes 20kV or more.
●
It might cause to damage the ignition coil if the gap of more than 17 mm is taken.
NOTE:
When the gap is less than 13 mm, the spark might be generated even if the coil is malfunctioning.
17. If NG, Replace ignition coil with power transistor.
CONDENSER
1.
Turn ignition switch OFF.
2.
Disconnect condenser harness connector.
Terminal No. (Polarity)
Resistance
Ω
[at 25
°
C (77
°
F)]
1 and 2
Except 0 or
∞
1 and 3
Except 0
2 and 3
Spark should be generated.
PBIB0847E
PBIB2087E
PBIB2325E
IGNITION SIGNAL
EC-653
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Revision: 2005 August
2005 Murano
3.
Check resistance between condenser terminals 1 and 2.
Removal and Installation
ABS004OD
IGNITION COIL WITH POWER TRANSISTOR
Refer to
Resistance
Above 1 M
Ω
at 25
°
C (77
°
F)
PBIB0794E
EC-654
VIAS
Revision: 2005 August
2005 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-655
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Revision: 2005 August
2005 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-656
VIAS
Revision: 2005 August
2005 Murano
Wiring Diagram
ABS004S8
TBWB0287E
VIAS
EC-657
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EC
Revision: 2005 August
2005 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]
●
More than a few seconds after turning igni-
tion switch OFF
BATTERY VOLTAGE
(11 - 14V)
119
120
R/B
R/B
Power supply for ECM
[Ignition switch: ON]
BATTERY VOLTAGE
(11 - 14V)
EC-658
VIAS
Revision: 2005 August
2005 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 3,600 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
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