Nissan Silvia. Manual — part 164
7
CHECK IACV-AAC VALVE
Refer to “Component Inspection”, EC-172.
OK or NG
OK
©
GO TO 8.
NG
©
Replace IACV-AAC valve.
8
CHECK INTERMITTENT INCIDENT
Refer to “TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT”, EC-82.
©
INSPECTION END
GI
MA
EM
LC
FE
CL
MT
AT
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
IDLE AIR CONTROL VALVE (IACV) — AUXILIARY AIR CONTROL (AAC) VALVE
Diagnostic Procedure (Cont’d)
EC-171
SEC442C
Component Inspection
=NMEC0748
IACV-AAC VALVE
NMEC0748S01
1.
Disconnect IACV-AAC valve harness connector.
2.
Remove IACV-AAC valve.
I
Check IACV-AAC valve resistance.
Resistance:
Approximately 10
Ω
[at 20°C (68°F)]
I
Check plunger for seizing or sticking.
I
Check for broken spring.
3.
Supply battery voltage between IACV-AAC valve connector
terminals.
Plunger should move.
If NG, replace IACV-AAC valve.
IDLE AIR CONTROL VALVE (IACV) — AUXILIARY AIR CONTROL (AAC) VALVE
Component Inspection
EC-172
SEF095X
Component Description
NMEC0749
The valve timing control system is utilized to control intake valve
opening and closing timing. Engine coolant temperature signals,
engine speed and throttle position are used to determine intake
valve timing.
The intake camshaft sprocket position is regulated by oil pressure
controlled by the intake valve timing control.
When ECM sends ON signal to intake valve timing control solenoid
valve, oil pressure is transmitted to camshaft sprocket. Then, intake
side camshaft is advanced.
SEC450C
Operation
NMEC0750
Engine operating condition
Intake valve timing
control solenoid valve
Intake valve opening
and closing time
Valve overlap
Engine speed
B/FUEL SCHDL
Neutral switch
Below 1,050 rpm
Above 1.3 msec (M/T)
OFF
ON
Advance
Increased
Above 1.5 msec (A/T)
1,050 - 5,700 rpm
—
Conditions other than those above
OFF
Normal
Normal
GI
MA
EM
LC
FE
CL
MT
AT
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
INTAKE VALVE TIMING CONTROL SOLENOID VALVE
Component Description
EC-173
CONSULT-II Reference Value in Data Monitor
Mode
NMEC0751
MONITOR ITEM
CONDITION
SPECIFICATION
INT/V TIM SOL
I
Engine: After warming up
I
Lift up drive wheels and shift to
suitable gear position other than
“P” or “N”
Idle
OFF
Quickly depress the accelerator
pedal, then quickly release it.
OFF
,
ON
,
OFF
ECM Terminals and Reference Value
NMEC0752
Specification data are reference values and are measured between each terminal and engine 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 grond other than ECM terminals, such as the ground.
TER-
MINAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
105
R/L
Intake valve timing control
solenoid valve
[Engine is running]
I
Idle speed
BATTERY VOLTAGE
(11 - 14V)
INTAKE VALVE TIMING CONTROL SOLENOID VALVE
CONSULT-II Reference Value in Data Monitor Mode
EC-174
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