Nissan Rogue Service Manual: P0506 ISC system
Description
The ECM controls the engine idle speed to a specified level through 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 varied 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 Description
DTC DETECTION LOGIC
| DTC No. | CONSULT screen terms (Trouble diagnosis content) | DTC detecting condition |
| P050 | ISC SYSTEM (Idle air control system RPM lower than expected) | The idle speed is less than the target idle speed by 100 rpm or more. |
POSSIBLE CAUSE
- Electric throttle control actuator
- Intake air leak
FAIL-SAFE
Not applicable
DTC CONFIRMATION PROCEDURE
1.CHECK DTC PRIORITY
If DTC P0506 is displayed with other DTC, first perform the trouble diagnosis for other DTC.
Is applicable DTC detected? YES >> Perform diagnosis of applicable. Refer to EC-93, "DTC Index".
NO >> GO TO 2.
2.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following procedure before conducting the next test.
- Turn ignition switch OFF and wait at least 10 seconds.
- Turn ignition switch ON.
- Turn ignition switch OFF and wait at least 10 seconds.
If the target idle speed is out of the specified value, perform EC-141, "Work Procedure", 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 above −10°C (14°F).
>> GO TO 3.
3.PERFORM DTC CONFIRMATION PROCEDURE
- Start engine and warm it up to normal operating temperature.
- Turn ignition switch OFF and wait at least 10 seconds.
- Start engine and run it for at least 1 minute at idle speed.
- Check 1st trip DTC.
Is 1st trip DTC detected? YES >> Proceed to EC-353, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis Procedure
1.CHECK DTC PRIORITY
If DTC P0506 is displayed with other DTC, first perform the trouble diagnosis for other DTC.
Is applicable DTC detected? YES >> Perform diagnosis of applicable. Refer to EC-93, "DTC Index".
NO >> GO TO 2.
2.CHECK INTAKE AIR LEAK
- Start engine and let it idle.
- Listen for an intake air leak after the mass air flow sensor.
Is intake air leak detected? YES >> Discover air leak location and repair.
NO >> Replace ECM. Refer to EC-499, "Removal and Installation".
P0500 VSS
Description
ECM receives vehicle speed signals from two different paths via CAN
communication line: One is from the
ABS actuator and electric unit (control unit) via the combination unit and the
...
P0507 ISC system
Description
The ECM controls the engine idle speed to a specified level through the fine
adjustment of the air, which is let
into the intake manifold, by operating the electric throttle control ac ...
Other materials:
Wiring diagram
REAR WINDOW DEFOGGER SYSTEM
Wiring Diagram
...
Periodic maintenance
IDLE SPEED
Inspection
1.CHECK IDLE SPEED
With CONSULT
Check idle speed in “DATA MONITOR” mode of “ENGINE” using CONSULT.
With GST
Check idle speed with Service $01 of GST.
>> INSPECTION END
IGNITION TIMING
Inspection
1.CHECK IGNITION TIMING
Attach timing light (A) to th ...
Harness connector
Description
HARNESS CONNECTOR (TAB-LOCKING TYPE)
The tab-locking type connectors help prevent accidental looseness
or disconnection.
The tab-locking type connectors are disconnected by pushing or
lifting the locking tab(s). Refer to the figure
below.
Refer to the next p ...
