Nissan Maxima Service and Repair Manual: P0506 ISC system

Description

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 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 P0506 is displayed with other DTC, first perform the trouble diagnosis for the other DTC

Nissan Maxima. DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following 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-21, "IDLE AIR VOLUME LEARNING : Special Repair Requirement", 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 −10C(14F).

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.

Diagnosis Procedure

1.CHECK INTAKE AIR LEAKAGE

  1. Start engine and let it idle.
  2. Listen for an intake air leakage after the mass air flow sensor.

2.REPLACE ECM

  1. Stop engine.
  2. Replace ECM.
    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 via the fine adjustment of the air, which is let into the intake manifold, by operating the electric throttle control actua ...

    Other materials:

    Heating (A/C OFF)
    The air conditioner does not activate. When you need to heat only, use this mode. 1. Press the AUTO button. 2. Turn the temperature control dial to set the desired temperature. The temperature of the passenger compartment will be maintained automatically. Air flow distribution and fa ...

    Tilt sensor
    Description The tilt sensor is installed to the steering column assembly. The pulse signal is input to the driver seat control unit when the tilt is operated. The driver seat control unit counts the pulse and calculates the tilt amount of the steering column. Component Function Chec ...

    Diagnosis and repair workflow
    Work Flow OVERALL SEQUENCE DETAILED FLOW\ 1.CHECK SYMPTOM Check the malfunction symptoms by performing the following items. Interview the customer to obtain the malfunction information (conditions and environment when the malfunction occurred). Check the symptom. 2.SELF-DIAGNOSIS ( ...

    Nissan Maxima Owners Manual

    Nissan Maxima Service and Repair Manual

    © 2017-2022 Copyright www.nimainfo.com
    0.0056