Question about Toyota Corolla

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ECU light is on..and since this happened, there is mild vibration while driving the car and the fuel consumption has also increased. Got it checked and was informed it is due to coil not firing but replacing with a new coil did not help and was told it could be that either there is really a problem with ECU or with the wiring that connnects to the coil - which of these is more likely..any views?

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  • svaraons Nov 06, 2008

    thanks emissionwiz for the immediate response, sorry did not get that detail from the mechanic - but if the problem is in ECU, would it require ECU to be replaced as this could cost much more than replacing the coil or wiring I suppose

  • demuthses Nov 10, 2008

    the car is running rough, low power and using alot of gas. the error code is 303 third cylinder misfiring. but i've replace the plugs and the coil and the same symptoms continue. what is a ecu/ecm?

  • yadayada
    yadayada May 11, 2010

    What is the code in memeory of ECM?



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The ECM or ECU however you call it is very seldom the problem (about 4% of the time), and in your case I doubt that it is for sure, get the codes for me ok?

Posted on Nov 07, 2008


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