Nissan Altima L32. Manual - part 562
P0507 ISC SYSTEM
EC-1369
< COMPONENT DIAGNOSIS >
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P0507 ISC SYSTEM
Description
INFOID:0000000004362209
The ECM controls the engine idle speed to a specified level via the fine adjustment of the air, which is let into
the intake manifold, by operating the electric throttle control actuator. The operating of the throttle valve is var-
ied to allow for optimum control of the engine idling speed. The crankshaft position sensor (POS) detects the
actual engine speed and sends a signal to the ECM.
The ECM controls the electric throttle control actuator so that the engine speed coincides with the target value
memorized in the ECM. The target engine speed is the lowest speed at which the engine can operate steadily.
The optimum value stored in the ECM is determined by taking into consideration various engine conditions,
such as during warming up, deceleration and engine load (air conditioner, power steering and cooling fan
operation, etc.).
DTC Logic
INFOID:0000000004362210
DTC DETECTION LOGIC
NOTE:
If DTC P0507 is displayed with other DTC, first perform the trouble diagnosis for the other DTC.
DTC CONFIRMATION PROCEDURE
1.
PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next test.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
If the target idle speed is out of the specified value, perform
EC-1053, "IDLE AIR VOLUME LEARNING :
, before conducting DTC Confirmation Procedure.
TESTING CONDITION:
• Before performing the following procedure, confirm that battery voltage is more than 11 V at idle.
• Always perform the test at a temperature approximately
−10°C(14°F).
>> GO TO 2.
2.
PERFORM DTC CONFIRMATION PROCEDURE
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.
4. Turn ignition switch OFF and wait at least 10 seconds.
5. Restart engine and run it for at least 1 minute at idle speed.
6. Check 1st trip DTC.
Is 1st trip DTC detected?
YES
>> Go to
EC-1369, "Diagnosis Procedure"
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000004362211
1.
CHECK PCV HOSE CONNECTION
Confirm that PCV hose is connected correctly.
Is the inspection result normal?
YES
>> GO TO 2.
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P0507
Idle speed control sys-
tem RPM higher than
expected
The idle speed is more than the target idle
speed by 200 rpm or more.
• Electric throttle control actuator
• Intake air leakage
• PCV system