> I need to identify two 42 pin chips in the ECU of my vehicle but
> these are custom numbered. All I know is that a 4.19MHz crystal
> is connected to pins 15/16 of one and pins 16/17 of the other.
>
> I initially thought they were 8031/51 but these are 40 pin chips right?

        Unfortunately many ECU chips are custom chips based on popular
microcontrollers but modified especially for the purpose of being in a car.
With that said, have you visited your local car wrecking yard? In my area
you can get replacement ECU's right out of wrecked cars yourself, the price
is often very reasonable. TTYL

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