90 MAP system Code 43 help needed

[Richard Wakeling]

Hi Mike,

    I have had this and I too was scratching my head for a while. Someone had fitted the
wrong Knock sensor. They looked identical just the resistance was different. On our
early Aussie Holdens the lower resistance type is used typically 3.8K ohms and on our
latter Eco Tec engines  the resistance is much higher 100K ohms. What is puzzling is why
a code 43 was not set initially when the wrong 100K sensor was first installed.
    I hope this is what's setting your code 43.

Cheers Richard.

mike.hoenes at ncmail.net wrote:

> I need a guru on this one.
>  My ECM is setting a code 43 - which on this setup is indicative of something wrong
> with the Knock Sensor circuit.
> I have replaced the sensor, the ECM, the distributor pickup, checked all the wiring,
> and I have checked all the "sense" voltages in the Knock Sensor circuit. All the
> voltages indicate that everything is normal and that it should not set the code.
> Does anyone know of another reason it sets a code 43?
> The system worked fine for about 6 months beofe it started setting the code.
>
> TIA
> mike
>
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