Nissan Sentra manuals

Nissan Sentra Service Manual: 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 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 Logic

DTC DETECTION LOGIC

NOTE:

If DTC P0507 is displayed with other DTC, first perform the trouble diagnosis for the other DTC.

DTC No.

CONSULT screen terms (Trouble diagnosis content)

DTC detecting condition

Possible cause

P0507 ISC SYSTEM (Idle air control system 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 leak
  • PCV system

DTC CONFIRMATION PROCEDURE

1.PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following procedure before conducting 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-140, "Work Procedure", before conducting DTC Confirmation Procedure.

TESTING CONDITION:

>> 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. Start engine and run it for at least 1 minute at idle speed.
  4. Check 1st trip DTC.

Is 1st trip DTC detected? YES >> Proceed to EC-336, "Diagnosis Procedure".

NO >> INSPECTION END

Diagnosis Procedure

1.CHECK PCV HOSE CONNECTION

Confirm that PCV hose is connected correctly.

Is the inspection result normal? YES >> GO TO 2.

NO >> Repair or replace error-detected parts.

2.CHECK INTAKE AIR LEAK

  1. Start engine and let it idle.
  2. 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-485, "Removal and Installation".

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 ac ...

P050A, P050B, P050E Cold start control
Description ECM controls ignition timing and engine idle speed when engine is started with pre-warming up condition. This control promotes the activation of three way catalyst by heating the c ...

Other materials:

Service Notice and Precautions for TPMS
WARNING: Radio waves could adversely affect electric medical equipment. Those who use a pacemaker should contact the electric medical equipment manufacturer for the possible influences before use. Low tire pressure warning lamp blinks for 1 minute, then turns ON when occurring any malfu ...

Precautions for refrigerant system service
WORKING WITH HFC-134a (R-134a) CAUTION: CFC-12 (R-12) refrigerant and HFC-134a (R-134a) refrigerant are not compatible. Compressor malfunction is likely to occur if the refrigerants are mixed, refer to “CONTAMINATED REFRIGERANT” below. To determine the purity of HFC-134a (R- ...

Component parts
STARTING SYSTEM (WITH INTELLIGENT KEY) Component Parts Location Starter motor Transmission range switch (CVT Models) IPDM E/R (view with air inlet duct removed) Clutch interlock switch (M/T Models) ECM BCM (view under instrument panel, left side of vehicle) Component Descri ...

© 2014-2020 Copyright www.nisentra.com