Question about 2001 Hyundai Accent

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Occasionally the engine will turn over but not start would you think it is anything to do with the ignition switch and key immobilizing the start up or is it likely to be something else.

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2001 Accent did not come with any 'immobilizer' features, other than burglar alarm and starter kill (then the engine would not crank at all). Sounds like you may have a fuel pump/pressure problem. You'll need to connect a fuel pressure gauge to it to see if that's where the problem is. Did the 'Check Engine' Light come ON? Whenever the 'CHECK ENGINE' light comes on, the ECU (Engine Control Unit) sets a Diagnostic Trouble Code (DTC). These codes identify the particular engine management system which caused the light to come on. You'll need to use/find an OBDII (On-Board Diagnostic) Scanner to retrieve any code which have been stored in the ECU computer. Afterward, we might be able to help you DIAGNOSE and perhaps eventually fix the problem.

Posted on Oct 18, 2009

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    This warning lamp indicates that the engine is locked by the immobilizer system, and the engine start sequence must be repeat again.

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    You have an electronic immobilizer key recognition problem. Now your key chip is not recognized by the transponder antenna fitted on the ignition switch barrel.

    tdisline_775.jpg


    This warning lamp indicates that the engine is locked by the immobilizer system, and the engine start sequence must be repeat again.

    From year 1995 in Audi-VW (VAG) cars is used engine immobilizer. The VAG group immobilizer system consists of an immobilizer ECU which controls the recognition of keys and the Engine Management ECU system. Immobilizer is activated when the ignition key is removed and, together with the engine control unit, largely prevents unauthorized starting of the engine. The system uses a transmitter and receiver unit in the ignition key (transponder). Whenever an attempt is made to start the engine, it transmits a new code to the car's electronics. The immobilizing is only cancelled and car motor electronic receives permission to start engine if the key sends a right authorization code.

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    That's your immobilizer system light:
    The Immobilizer System protects your car from theft. A properly coded master or valet key must be used in the ignition switch for the engine to start.
    If an improperly coded key (or other device) is used, the engine’s fuel system is disabled.
    When you turn the ignition switch to ON (II), the Immobilizer System indicator should come on for a few seconds, then go out. If the indicator starts to blink, it means the system does not recognize the coding of the key. Turn the ignition switch to LOCK (0), remove the key, reinsert it, and turn the switch to ON (II) again.
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    Do not attempt to alter this system or add other devices to it. Electrical problems could result that may make your car undriveable.
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