Infiniti I30 (A33). Manual — part 279
SEF058Y
PROCEDURE FOR MALFUNCTION A
NHEC0253S01
TESTING CONDITION:
Before performing the following procedure, confirm that bat-
tery voltage is more than 10.5V with ignition switch “ON”.
With CONSULT-II
NHEC0253S0101
1)
Turn ignition switch “ON”.
2)
Select “DATA MONITOR” mode with CONSULT-II.
3)
Start engine and let it idle.
4)
Keep engine speed at 2,500 rpm for three seconds, then let it
idle for three seconds.
Do not rev engine to more than 3,000 rpm.
5)
Perform step 4 once more.
6)
If 1st trip DTC is detected, go to “Diagnostic Procedure”,
EC-433.
With GST
NHEC0253S0102
Follow the procedure “With CONSULT-II” above.
SEF174Y
PROCEDURE FOR MALFUNCTION B
NHEC0253S02
TESTING CONDITION:
I
Before performing the following procedure, confirm that
battery voltage is more than 11V at idle.
I
Always perform the test at a temperature above −10°C
(14°F).
With CONSULT-II
NHEC0253S0201
1)
Open engine hood.
2)
Start engine and warm it up to normal operating temperature.
3)
Turn ignition switch “OFF” and wait at least 10 seconds.
4)
Turn ignition switch “ON” again and select “DATA MONITOR”
mode with CONSULT-II.
5)
Start engine and run it for at least 1 minute at idle speed.
6)
If 1st trip DTC is detected, go to “Diagnostic Procedure”,
EC-433.
With GST
NHEC0253S0202
Follow the procedure “With CONSULT-II” above.
GI
MA
EM
LC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0505 IDLE AIR CONTROL VALVE (IACV) — AUXILIARY AIR CONTROL
(AAC) VALVE
DTC Confirmation Procedure (Cont’d)
EC-431
Wiring Diagram
NHEC0254
MEC817C
SEF625XB
DTC P0505 IDLE AIR CONTROL VALVE (IACV) — AUXILIARY AIR CONTROL
(AAC) VALVE
Wiring Diagram
EC-432
Diagnostic Procedure
NHEC0255
1
CHECK IACV-AAC VALVE POWER SUPPLY CIRCUIT
1. Stop engine.
2. Disconnect IACV-AAC valve harness connector.
SEC008C
3. Turn ignition switch “ON”.
4. Check voltage between IACV-AAC valve terminals 2, 5 and ground with CONSULT-II or tester.
SEF343X
OK or NG
OK
©
GO TO 3.
NG
©
GO TO 2.
2
DETECT MALFUNCTIONING PART
Check the following.
I
Harness connectors E15, F18
I
Harness for open or short between IACV-AAC valve and ECM relay
©
Repair harness or connectors.
GI
MA
EM
LC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0505 IDLE AIR CONTROL VALVE (IACV) — AUXILIARY AIR CONTROL
(AAC) VALVE
Diagnostic Procedure
EC-433
3
CHECK IACV-AAC VALVE OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch “OFF”.
2. Disconnect ECM harness connector.
3. Check harness continuity between ECM terminals and IACV-AAC valve terminals as follows.
Refer to Wiring Diagram.
MTBL0354
Continuity should exist.
4. Also check harness for short to ground and short to power.
OK or NG
OK
©
GO TO 4.
NG
©
Repair open circuit or short to ground or short to power in harness or connectors.
4
CHECK AIR CONTROL VALVE (POWER STEERING) OPERATION-I
1. Reconnect ECM harness connector and IACV-AAC valve harness connector.
2. Disconnect vacuum hose connected to air control valve (Power steering) at intake air duct.
3. Start engine and let it idle.
4. Check vacuum hose for vacuum existence.
SEF971X
Vacuum slightly exists or does not exist.
OK or NG
OK
©
GO TO 5.
NG
©
Replace air control valve (Power steering).
DTC P0505 IDLE AIR CONTROL VALVE (IACV) — AUXILIARY AIR CONTROL
(AAC) VALVE
Diagnostic Procedure (Cont’d)
EC-434
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