Nissan Frontier D22. Instruction — part 323
DTC P0505 ISC SYSTEM
EC-395
[KA24DE]
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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 ECM terminals, such as the ground.
: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)
Diagnostic Procedure
UBS00D91
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-396
[KA24DE]
DTC P0505 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
EC-120, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"
>> INSPECTION END.
Continuity should exist.
Resistance
: Approximately 10
Ω [at 25°C (77°F)]
SEF249W
DTC P0506 ISC SYSTEM
EC-397
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EC
DTC P0506 ISC SYSTEM
PFP:23781
Description
UBS00D92
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
UBS00D93
On Board Diagnosis Logic
UBS00D94
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 No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P0506
Idle speed control sys-
tem RPM lower than
expected
The idle speed is less than the target idle
speed by 100 rpm or more.
●
Harness or connectors
(The IACV-AAC valve circuit is open or
shorted)
●
IACV-AAC valve
EC-398
[KA24DE]
DTC P0506 ISC SYSTEM
DTC Confirmation Procedure
UBS00D95
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 10 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-400, "Diagnostic Procedure"
.
WITH GST
Follow the procedure “WITH CONSULT-II”.
SEF174Y
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