Nissan Frontier D22. Manual - part 322

 

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Nissan Frontier D22. Manual - part 322

 

 

DTC P0500 VSS

EC-391

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EC

5. 

CHECK INTERMITTENT INCIDENT

Perform 

EC-120, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

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>> INSPECTION END.

EC-392

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DTC P0505 ISC SYSTEM

DTC P0505 ISC SYSTEM

PFP:23781

Description

UBS00D8W

SYSTEM DESCRIPTION

This system automatically controls engine idle speed to a specified level. Idle speed is controlled through fine
adjustment of the amount of air which bypasses the throttle valve via IACV-AAC valve. The IACV-AAC valve
repeats ON/OFF operation according to the signal sent from the ECM. The camshaft position sensor detects
the actual engine speed and sends a signal to the ECM. The ECM then controls the ON/OFF time of the IACV-
AAC valve so that engine speed coincides with the target value memorized in ECM. The target engine speed
is the lowest speed at which the engine can operate steadily. The optimum value stored in the ECM is deter-
mined by taking into consideration various engine conditions, such as during warm up, deceleration, and
engine load (air conditioner, power steering and cooling fan operation). 

COMPONENT DESCRIPTION

The IAC valve-AAC valve is moved by ON/OFF pulses from the
ECM. The longer the ON pulse, the greater the amount of air that will
flow through the valve. The more air that flows through the valve, the
higher the idle speed.

CONSULT-II Reference Value in Data Monitor Mode

UBS00D8X

Sensor

Input Signal to ECM

ECM function

Actuator

Camshaft position sensor

Engine speed

Idle air control

IACV-AAC valve

Mass air flow sensor

Amount of intake air

Engine coolant temperature sensor

Engine coolant temperature

Ignition switch

Start signal

Throttle position sensor

Throttle position

Park/neutral position (PNP) switch

Park/Neutral position

Air conditioner switch

Air conditioner operation

Power steering oil pressure switch

Power steering load signal

Battery

Battery voltage

Vehicle speed sensor

Vehicle speed

Intake air temperature sensor

Intake air temperature

SEF040E

MONITOR ITEM

CONDITION

SPECIFICATION

IACV-AAC/V

Engine: After warming up

Air conditioner switch: OFF

Shift lever: P or N

No-load

Idle

Approx. 30%

2,000 rpm

DTC P0505 ISC SYSTEM

EC-393

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On Board Diagnosis Logic

UBS00D8Y

DTC Confirmation Procedure

UBS00D8Z

NOTE:
If “DTC Confirmation Procedure” has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 10.5V with igni-
tion switch “ON”.

 WITH CONSULT-II

1.

Turn ignition switch ON.

2.

Select “DATA MONITOR” mode with CONSULT-II.

3.

Wait at least 2 seconds.

4.

If 1st trip DTC is detected, go to 

EC-395, "Diagnostic Procedure"

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 WITH GST

Follow the procedure “WITH CONSULT-II”.

DTC No.

Trouble Diagnosis Name

DTC Detecting Condition

Possible Cause

P0505

IACV-AAC valve circuit

An improper voltage signal is sent to 
ECM through IACV-AAC valve.

Harness or connectors
(The IACV-AAC valve circuit is open or 
shorted.)

IACV-AAC valve

SEF058Y

EC-394

[KA24DE]

DTC P0505 ISC SYSTEM

Wiring Diagram

UBS00D90

BBWA0449E

 

 

 

 

 

 

 

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