Nissan Frontier D22. Manual — part 471
DTC P0505 ISC SYSTEM
EC-987
[VG33E]
C
D
E
F
G
H
I
J
K
L
M
A
EC
3.
Turn ignition switch ON again and select “DATA MONITOR”
mode with CONSULT-II.
4.
Start engine and run it for at least 1 minute at idle speed.
5.
If 1st trip DTC is detected, go to
EC-989, "Diagnostic Procedure"
.
With GST
Follow the procedure “With CONSULT-II”.
SEF174Y
EC-988
[VG33E]
DTC P0505 ISC SYSTEM
Wiring Diagram
UBS00DMG
BBWA1091E
DTC P0505 ISC SYSTEM
EC-989
[VG33E]
C
D
E
F
G
H
I
J
K
L
M
A
EC
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 the ECM terminals, such as the ground.
: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)
Diagnostic Procedure
UBS00DMH
1.
CHECK IACV-AAC VALVE POWER SUPPLY CIRCUIT
1.
Stop engine.
2.
Disconnect IACV-AAC valve harness connector.
3.
Turn ignition switch ON.
4.
Check voltage between terminal 2 and ground with CONSULT-II
or tester.
OK or NG
OK
>> GO TO 3.
NG
>> GO TO 2.
TER-
MINAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
101
OR/L
IACV-AAC valve
[Engine is running]
●
Warm-up condition
●
Idle speed
NOTE:
The pulse cycle changes depending on rpm
at idle
8 - 11V
[Engine is running]
●
Warm-up condition
●
Engine speed is 3,000 rpm
7 - 10V
SEF005V
SEF692W
BBIA0427E
Voltage: Battery voltage
SEF651W
EC-990
[VG33E]
DTC P0505 ISC SYSTEM
2.
DETECT MALFUNCTIONING PART
Check the following.
●
Harness connectors M81, F36
●
Harness connectors F37, F101
●
Fuse block (J/B) connector M27
●
10A fuse
●
Harness for open or short between IACV-AAC valve and fuse
>> Repair open circuit or short to ground or short to power in harness or connectors.
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 terminal 101 and IACV-AAC valve terminal 1.
Refer to Wiring Diagram.
4.
Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 5.
NG
>> GO TO 4.
4.
DETECT MALFUNCTIONING PART
Check the following.
●
Harness connectors F101, F37
●
Harness for open or short between IACV-AAC valve and ECM
>> Repair open circuit or short to ground or short to power in harness or connectors.
5.
CHECK IACV-AAC VALVE
1.
Disconnect IACV-AAC valve harness connector.
2.
Remove IACV-AAC valve.
–
Check IACV-AAC valve resistance.
–
Check plunger for seizing or sticking.
–
Check for broken spring.
3.
Supply battery voltage between IACV-AAC valve connector ter-
minals.
Plunger should move.
OK or NG
OK
>> GO TO 6.
NG
>> Replace IACV-AAC valve.
6.
CHECK INTERMITTENT INCIDENT
EC-696, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"
>> INSPECTION END.
Continuity should exist.
Resistance: Approximately 10
Ω [at 20°C (68°F)]
SEF202V
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