Nissan Frontier D22. Instruction — part 322
DTC P0500 VSS
EC-391
[KA24DE]
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EC
5.
CHECK INTERMITTENT INCIDENT
Perform
EC-120, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"
>> INSPECTION END.
EC-392
[KA24DE]
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
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Engine: After warming up
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Air conditioner switch: OFF
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Shift lever: P or N
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No-load
Idle
Approx. 30%
2,000 rpm
—
DTC P0505 ISC SYSTEM
EC-393
[KA24DE]
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EC
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"
.
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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