Nissan Silvia. Manual — part 166
Description
NMEC0756
SYSTEM DESCRIPTION
NMEC0756S01
Sensor
Input Signal to ECM
ECM func-
tion
Actuator
Camshaft position sensor
Engine speed
Charged
air pres-
sure con-
trol
Wastegate valve control sole-
noid valve
Mass air flow sensor
Amount of intake air
Engine coolant temperature sensor
Engine coolant temperature
Ignition switch
Start signal
Throttle position sensor
Throttle position
Park/Neutral position switch
Park/Neutral position
Battery
Battery voltage
Vehicle speed sensor
Vehicle speed
Knock sensor
Engine knocking condition
SEF984P
This system controls charged air pressure corresponding to the
driving conditions through wastegate valve control solenoid valve.
The wastegate valve control solenoid valve repeats ON/OFF
operation according to the signal sent from the ECM. The ECM
controls the ON/OFF time of the wastegate valve control solenoid
valve according to the data memorized in the ECM. The optimum
value stored in the ECM is determined by taking into consideration
various engine conditions, such as engine speed, throttle valve
opening angle, gear position, etc., and fuel octane rating. Knock
sensor signal is used to determine the fuel octane rating.
SEC386C
COMPONENT DESCRIPTION
NMEC0756S02
Wastegate Valve Control Solenoid Valve
NMEC0756S0201
The wastegate valve control solenoid valve is moved by ON/OFF
pulses from the ECM. The longer the ON pulse, the higher the
charged air pressure is provided.
CONSULT-II Reference Value in Data Monitor
Mode
NMEC0757
MONITOR ITEM
CONDITION
SPECIFICATION
W/G CONT S/V
I
Engine: After warming up
I
Air conditioner switch: OFF
I
Shift lever: N
I
No-load
Idle
0%
Revving engine up to 4,000 rpm
20%
GI
MA
EM
LC
FE
CL
MT
AT
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
WASTEGATE VALVE CONTROL SOLENOID VALVE
Description
EC-179
ECM Terminals and Reference Value
=NMEC0758
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.
TERMI-
NAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
115
OR/B
Wastegate valve control
solenoid valve
[Engine is running]
I
Idle speed
BATTERY VOLTAGE
(11 - 14V)
[Engine is running]
I
Warm-up condition
I
Rev engine up to 4,000 rpm
Approximately 0V
WASTEGATE VALVE CONTROL SOLENOID VALVE
ECM Terminals and Reference Value
EC-180
Wiring Diagram
NMEC0759
TEC813
GI
MA
EM
LC
FE
CL
MT
AT
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
WASTEGATE VALVE CONTROL SOLENOID VALVE
Wiring Diagram
EC-181
Diagnostic Procedure
NMEC0760
1
CHECK OVERALL FUNCTION
1. Turn ignition switch “OFF”.
2. Disconnect air passage hose connected to wastegate valve control solenoid valve.
SEC394C
3. Start engine.
4. Make sure that charged air pressure exists under the following conditions.
SEC395C
OK or NG
OK
©
GO TO 2.
NG (With CONSULT-II)
©
GO TO 3.
NG (Without CONSULT-
II)
©
GO TO 4.
2
CHECK WASTEGATE VALVE ACTUATOR
1. Stop engine.
2. Check wastegate valve actuator. Refer to EM-62, “WASTEGATE VALVE ACTUATOR”.
OK or NG
OK
©
INSPECTION END
NG
©
Replace wastegate valve actuator.
WASTEGATE VALVE CONTROL SOLENOID VALVE
Diagnostic Procedure
EC-182
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