LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Toyota >> 2004 >> Corolla LE, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (SFI) >> SFI System >> On-Vehicle Inspection
April 5, 2026: LEMON Manuals is launched! Read the announcement.

On-Vehicle Inspection

  1. INSPECTION THROTTLE BODY IDLE SPEED CONTROL VALVE ASSY 
    NOTE:
    • It is impossible to check the resister value and the operation of ISC valve by itself, because the ISC valve has an IC circuit inside it, which transforms the duty signal from the ECM to the derive signal.
    • After checking, erase the DTC.
    • Clear the DTC after inspection.

    HINT:

    When the ISC valve system has malfunctions except for its adherence, DTC P0505 is detected.

    1. Operation inspection.
      1. Connect the ISC connector to the ISC valve.
      2. Check the ISC valve movement when the ignition switch is turned ON.

        Movement: Half open --> fully close --> fully open --> half open 

    HINT:

    ISC valve moves within 0.5 second.

    Fig 1: Inspecting Throttle Body Idle Speed Control Valve Assy
    G02898408Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002