Nissan Frontier D22. Manual - part 325

DTC P0507 ISC SYSTEM

EC-403

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EC

DTC Confirmation Procedure

UBS00D9B

NOTE:
If “DTC Confirmation Procedure” has been previously conducted, always turn ignition switch OFF and wait at
least 5 seconds before conducting the next test.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 11V at idle.

 WITH CONSULT-II

1.

Start engine and warm it up to normal operating temperature.

2.

Turn ignition switch OFF and wait at least 5 seconds.

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-405, "Diagnostic Procedure"

.

 WITH GST

Follow the procedure “WITH CONSULT-II”.

SEF174Y

EC-404

[KA24DE]

DTC P0507 ISC SYSTEM

Wiring Diagram

UBS00D9C

BBWA0449E

DTC P0507 ISC SYSTEM

EC-405

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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.

: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)

Diagnostic Procedure

UBS00D9D

1. 

CHECK POWER SUPPLY

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

10.5 - 11.5V

[Engine is running]

●

Warm-up condition

●

Engine speed is 2,000 rpm

1 - 13V

SEF015W

SEF016W

SEF342V

Voltage

: Battery voltage

SEF247W

EC-406

[KA24DE]

DTC P0507 ISC SYSTEM

2. 

DETECT MALFUNCTIONING PART

Check the following.

●

Harness connectors M59, F27

●

Fuse block (J/B) connector M27

●

10A fuse

●

Harness for open or short between IACV-AAC valve and fuse

>> Repair harness or connectors.

3. 

CHECK OUTPUT SIGNAL CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

Check harness continuity between ECM terminal 101 and terminal 1.
Refer to Wiring Diagram.

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 IACV-AAC VALVE

Disconnect IACV-AAC valve harness connector.

●

Check IACV-AAC valve resistance.

●

Check plunger for seizing or sticking.

●

Check for broken spring.

OK or NG

OK

>> GO TO 5.

NG

>> Replace IACV-AAC valve.

5. 

CHECK INTERMITTENT INCIDENT 

Perform 

EC-120, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

>> INSPECTION END.

Continuity should exist.

Resistance

: Approximately 10 

Ω [at 25°C (77°F)]

SEF249W