2004 NISSAN TERRANO Service Repair Manual

12 CHECK INTERMITTENT INCIDENT
Refer to ªTROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENTº, EC-78.EINSPECTION END
HEAT UP SWITCHZD30DDTi
Diagnostic Procedure (Cont'd)
EC-270
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Description
SYSTEM DESCRIPTION
SensorInput Signal to ECM ECM
Function Actuator
Ignition switch Start signal Swirl
control valve
control Swirl control valve control solenoid valve
"Vacuum signal
Swirl control valve actuator "
Swirl control valve
Crankshaft position sensor (TDC) Engine speed
PNP switch Park/Neutral position signal
Engine coolant temperature sensor Engine coolant temperature
This system has a swirl control valve in the throttle body.
While idling and during low engine speed operation, the swirl con-
trol valve closes. Thus the velocity of the air in the intake passage
increases, promoting the vaporization of the fuel and producing a
swirl in the combustion chamber.
Because of this operation, this system tends to increase the burn-
ing speed of the gas mixture, improve fuel consumption, and
increase the stability in running conditions.
Also, except when idling and during low engine speed operation,
this system opens the swirl control valve. In this condition, this
system tends to increase power by improving intake efficiency via
reduction of intake flow resistance, intake flow.
The solenoid valve controls swirl control valve's shut/open condi-
tion. This solenoid valve is operated by the ECM.
PNP switch Engine speed
Engine cool-
ant tempera- ture Swirl control
valve control
solenoid valve Swirl control
valve
OFF Less than
1,250 rpm
Less than
50ÉC (122ÉF) OFF Open
More than
50ÉC (122ÉF) ON Closed
More than
1,250 rpm Less than
50ÉC (122ÉF) OFF Open
More than
50ÉC (122ÉF) OFF Open
ON Ð Ð OFF Open
SEF452Z
SWIRL CONTROL VALVE CONTROL SOLENOID VALVEZD30DDTi
EC-271
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COMPONENT DESCRIPTION
Swirl control valve control solenoid valve
The swirl control valve control solenoid valve responds to signals
from the ECM. When the ECM sends an ON (ground) signal, the
solenoid valve is bypassed to apply vacuum pump vacuum to the
swirl control valve actuator. This operation closes the swirl control
valve. When the ECM sends an OFF signal, the vacuum signal is
cut and the swirl control valve opens.
CONSULT-II Reference Value in Data Monitor
Mode
Specification data are reference values.
MONITOR ITEMCONDITION SPECIFICATION
SWRL CONT S/V I
Lift up the vehicle
I Engine: After warming up, let it
idle for more than 1 second.
I Air conditioner switch: OFF
I No-load Shift lever: Except ªPº and ªNeutralº
position
ON
Shift lever: ªNeutralº position OFF
ECM Terminals and Reference Value
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 damage the
ECM's transistor. Use a ground other than ECM terminals, such as the ground.
TER-
MINAL NO. WIRE
COLOR ITEM CONDITION D ATA
(DC Voltage and Pulse Signal)
54 R Swirl control valve control
solenoid valve Engine is running.
Warm-up condition
At idle speed for more than 1 second.
Lift up the vehicle
Gear position is except ªPº and ªNeutralº
Approximately 0.1V
Engine is running.
Idle speed
Lift up the vehicle
Gear position is ªPº or ªNeutralº BATTERY VOLTAGE
(11 - 14V)
MEC006E
SWIRL CONTROL VALVE CONTROL SOLENOID VALVEZD30DDTi
Description (Cont'd)
EC-272
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Wiring Diagram
YEC199A
SWIRL CONTROL VALVE CONTROL SOLENOID VALVEZD30DDTi
EC-273
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Diagnostic Procedure
1 INSPECTION START
Do you have CONSULT-II?YesorNo
Ye s EGO TO 2.
No EGO TO 3.
2 CHECK OVERALL FUNCTION
With CONSULT-II
1. Start engine and let it idle.
2. Select ªSWIRL CONT S/V 1º in ªACTIVE TESTº mode with CONSULT-II.
3. Touch ªONº and ªOFFº alternately on CONSULT-II screen.
4. Make sure that swirl control valve actuator rod moves according to ªSWIRL CONT S/V 1º indication.
MEC007E
MEC008E
OK or NG
OK EINSPECTION END
NG EGO TO 4.
SWIRL CONTROL VALVE CONTROL SOLENOID VALVEZD30DDTi
EC-274
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3 CHECK OVERALL FUNCTION
Without CONSULT-II
1. Lift up the vehicle.
2. Start engine and warm it up to normal operating temperature.
3. Run engine at idle speed.
4. Make sure that swirl control valve actuator rod moves when shifting the shift lever to ªPº or ªNeutralº position and then to posi- tions other than ªPº and ªNeutralº.
MEC008E
OK or NG
OK EINSPECTION END
NG EGO TO 5.
SWIRL CONTROL VALVE CONTROL SOLENOID VALVEZD30DDTi
Diagnostic Procedure (Cont'd)
EC-275
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4 CHECK VACUUM SOURCE
With CONSULT-II
1. Turn ignition switch ªOFFº.
2. Disconnect vacuum hose connected to swirl control valve actuator.
3. Start engine and let it idle.
4. Select ªSWIRL CONT S/V 1º in ªACTIVE TESTº mode with CONSULT-II.
5. Touch ªONº and ªOFFº alternately on CONSULT-II screen.
6. Check vacuum hose for vacuum existence under the following conditions.
MEC007E
MEC009E
MTBL1326
OK or NG
OK EGO TO 7.
NG EGO TO 6.
SWIRL CONTROL VALVE CONTROL SOLENOID VALVEZD30DDTi
Diagnostic Procedure (Cont'd)
EC-276
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5 CHECK VACUUM SOURCE
Without CONSULT-II
1. Turn ignition switch ªOFFº.
2. Disconnect vacuum hose connected to swirl control valve actuator.
3. Lift up the vehicle.
4. Start engine and warm it up to normal operating temperature.
5. Run engine at idle speed
6. Check vacuum hose for vacuum existence under the following conditions.
MEC009E
MTBL1327
OK or NG
OK EGO TO 7.
NG EGO TO 6.
SWIRL CONTROL VALVE CONTROL SOLENOID VALVEZD30DDTi
Diagnostic Procedure (Cont'd)
EC-277
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