Nissan Terrano model r20 series 2004. Instruction — part 137
12
CHECK INTERMITTENT INCIDENT
Refer to “TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT”, EC-78.
E
INSPECTION END
HEAT UP SWITCH
ZD30DDTi
Diagnostic Procedure (Cont’d)
EC-270
Description
SYSTEM DESCRIPTION
Sensor
Input 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
50°C (122°F)
OFF
Open
More than
50°C (122°F)
ON
Closed
More than
1,250 rpm
Less than
50°C (122°F)
OFF
Open
More than
50°C (122°F)
OFF
Open
ON
—
—
OFF
Open
SEF452Z
SWIRL CONTROL VALVE CONTROL SOLENOID VALVE
ZD30DDTi
EC-271
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 ITEM
CONDITION
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 “P” and “Neutral”
position
ON
Shift lever: “Neutral” 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
DATA
(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 “P” and “Neutral”
Approximately 0.1V
Engine is running.
Idle speed
Lift up the vehicle
Gear position is “P” or “Neutral”
BATTERY VOLTAGE
(11 - 14V)
MEC006E
SWIRL CONTROL VALVE CONTROL SOLENOID VALVE
ZD30DDTi
Description (Cont’d)
EC-272
Wiring Diagram
YEC199A
SWIRL CONTROL VALVE CONTROL SOLENOID VALVE
ZD30DDTi
EC-273
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