Nissan Silvia. Manual — part 163
ECM Terminals and Reference Value
NMEC0745
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)
113
SB
IACV-AAC valve
[Engine is running]
I
Warm-up condition
I
Idle speed
Approximately 10V
SEC372C
[Engine is running]
I
Warm-up condition
I
Idle speed
I
Both A/C switch and blower fan switch are “ON”
(Compressor is operating)
I
Rear window defogger switch is “ON”.
Approximately 11V
SEC373C
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
ECM Terminals and Reference Value
EC-167
Wiring Diagram
NMEC0746
TEC815
IDLE AIR CONTROL VALVE (IACV) — AUXILIARY AIR CONTROL (AAC) VALVE
Wiring Diagram
EC-168
Diagnostic Procedure
NMEC0747
1
INSPECTION START
Do you have CONSULT-II?
Yes or No
Yes
©
GO TO 2.
No
©
GO TO 3.
2
CHECK OVERALL FUNCTION
With CONSULT-II
1. Start engine and warm it up to normal operating temperature.
2. Perform “IACV-AAC/V OPENING” in ACTIVE TEST mode with CONSULT-II.
3. Check engine speed varies corresponding to IACV-AAC VALVE opening percent.
SEC334C
OK or NG
OK
©
INSPECTION END
NG
©
GO TO 4.
3
CHECK OVERALL FUNCTION
Without CONSULT-II
1. Start engine and warm it up to normal operating temperature.
2. Check idle speed.
M/T: 800
±
50 rpm
A/T: 800
±
50 rpm (in “P” or “N” position)
If NG, adjust idle speed. Refer to “Basic Inspection”, EC-50.
3. Stop engine and disconnect throttle position sensor harness connector.
4. Restart engine and let it idle after revving it to 2,000 to 3,000 rpm a few times.
5. Check idle speed again.
750
±
50 rpm
OK or NG
OK
©
INSPECTION END
NG
©
GO TO 4.
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
EC-169
4
CHECK POWER SUPPLY
1. Stop engine.
2. Disconnect IACV-AAC valve harness connector.
SEC384C
3. Turn ignition switch “ON”.
4. Check voltage between terminal 2 and ground with CONSULT-II or tester.
SEC441C
Voltage: Battery voltage
OK or NG
OK
©
GO TO 3.
NG
©
GO TO 2.
5
DETECT MALFUNCTIONING PART
Check the following.
I
Harness connectors M60, F4
I
Fuse block (J/B) connector M7
I
10A fuse
I
Harness for open or short between IACV-AAC valve and fuse
©
Repair harness or connectors.
6
CHECK OUTPUT SIGNAL CIRCUIT
1. Turn ignition switch “OFF”.
2. Disconnect ECM harness connector.
3. Check harness continuity between ECM terminal 113 and IACV-AAC valve terminal 1. Refer to Wiring Diagram.
Continuity should exist.
4. Also check harness for short to ground and short to power.
OK or NG
OK
©
GO TO 7.
NG
©
Repair open circuit or short to ground or short to power in harness or connectors.
IDLE AIR CONTROL VALVE (IACV) — AUXILIARY AIR CONTROL (AAC) VALVE
Diagnostic Procedure (Cont’d)
EC-170
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