Nissan Silvia. Instruction — part 174
Diagnostic Procedure
=NMEC0787
1
CHECK OVERALL FUNCTION
1. Start engine and warm it up to normal operating temperature.
2. Check idle speed.
800
±
50 rpm (in “N” position)
If NG, adjust idle speed.
3. Turn air conditioner switch and blower fan switch “ON”.
4. Recheck idle speed.
SEF742U
800 rpm or more (in “P” or “N” position)
OK or NG
OK
©
INSPECTION END
NG
©
GO TO 2.
2
CHECK AIR CONDITIONER FUNCTION
Check if air conditioner compressor functions normally.
OK or NG
OK
©
GO TO 3.
NG
©
Refer to “TROUBLE DIAGNOSES”, HA-19.
3
CHECK POWER SUPPLY
1. Turn air conditioner switch and blower fan switch “OFF”.
2. Stop engine.
3. Disconnect IACV-FICD solenoid valve harness connector.
SEC384C
4. Disconnect A/C relay.
5. Check harness continuity between A/C relay terminal 3 and IACV-FICD solenoid valve terminal 2. Refer to Wiring Dia-
gram.
Continuity should exist.
6. Also check harness for short to ground and short to power.
OK or NG
OK
©
GO TO 5.
NG
©
GO TO 4.
GI
MA
EM
LC
FE
CL
MT
AT
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
IACV-FICD SOLENOID VALVE
Diagnostic Procedure
EC-211
4
DETECT MALFUNCTIONING PART
Check the following.
I
Harness for open or short between IACV-FICD solenoid valve and harness connector F4
©
Repair harness or connectors.
5
CHECK GROUND CIRCUIT
1. Check harness continuity between IACV-FICD solenoid valve terminal 1 and engine ground. Refer to Wiring Diagram.
Continuity should exist.
2. Also check harness for short to power.
OK or NG
OK
©
GO TO 6.
NG
©
Repair open circuit or short to power in harness or connectors.
6
CHECK IACV-FICD SOLENOID VALVE
Refer to “Component Inspection”, EC-212.
OK or NG
OK
©
GO TO 7.
NG
©
Replace IACV-FICD solenoid valve.
7
CHECK INTERMITTENT INCIDENT
Refer to “TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT”, EC-82.
©
INSPECTION END
SEC436C
Component Inspection
NMEC0788
IACV-FICD SOLENOID VALVE
NMEC0788S01
Disconnect IACV-FICD solenoid valve harness connector.
I
Check for clicking sound when applying 12V direct current to
terminals.
SEF097K
I
Check plunger for seizing or sticking.
I
Check for broken spring.
IACV-FICD SOLENOID VALVE
Diagnostic Procedure (Cont’d)
EC-212
SEC391C
Component Description
NMEC0789
The power steering oil pressure switch is attached to the power
steering high-pressure tube and detects a power steering load.
When a power steering load is detected, it signals the ECM. The
ECM adjusts the IACV-AAC valve to increase the idle speed and
adjust for the increased load.
CONSULT-II Reference Value in Data Monitor
Mode
NMEC0790
Specification data are reference values.
MONITOR ITEM
CONDITION
SPECIFICATION
PW/ST SIGNAL
I
Engine: After warming up, idle
the engine
Steering wheel in neutral position
(forward direction)
OFF
The steering wheel is fully turned
ON
ECM Terminals and Reference Value
NMEC0791
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)
43
PU/W
Power steering oil pressure
switch
[Engine is running]
I
Steering wheel is fully turned
Approximately 0V
[Engine is running]
I
Steering wheel is not turned
Approximately 5V
GI
MA
EM
LC
FE
CL
MT
AT
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
POWER STEERING OIL PRESSURE SWITCH
Component Description
EC-213
Wiring Diagram
NMEC0792
TEC819
POWER STEERING OIL PRESSURE SWITCH
Wiring Diagram
EC-214
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