Re: [doc] Progress...

[Martin Gutkowski <martin@xxxxxxxxxxxxxx>]

Hi Nick

It's my good friend and colleague Joe who repairs them and he has 
successfully repaired several in the manner you describe (Chris Hawes 
will bear witness to this - his is one of them!). I have a Renault 
manual describing the resistance on the thermistor and it drops as 
temperature increases. Plus the problem only manifests itself with a hot 
engine in that case, and Daniel's does it when the engine's cold.

Check out the values of the resistors on the pot-down on the ignition 
signal input, and as you know the IC's are CMOS. Joe couldn't believe it 
either and had to test mine running in my car - the scope doesn't lie.To 
reverse engineer the units, this has to be generated, and not many 
signal gennys'll do 35v.

Martin

Nick Tomlinson wrote:

> You must be unlucky having to repair these cases Martin because the 5 
> I've repaired were just down to the chips (although 1 did need a wire 
> over a track as the shorted idle speed motor popped a track that acted 
> like a fuse). Lucky for the owners hey.
>
> You mentioned that the thermistor was connected but did you check it's 
> resistance value back at the ecu plug to confirm that the wires are 
> OK? You can use conecting cables and between the plug and the ecu to 
> effectively break out the thermistor from the equation and use a 
> variable resistor to simulate the thermistors temperature 
> characteristics. Should be approx 50-80kohm at 15celsius and 3-4kohm 
> at 80celcius engine coolant temperature if my memory serves me right.
>
> Mind you, I don't understand about the 35v pulse that the ignition ecu 
> generating as you describe would be the problem. This would control 
> the firing of the coil and can be determined with a timing light on 
> the HT lead etc. The switching action (periodicity) of the earth/ 
> ground of the coil is measured by the Idle ECU to obtain feedback on 
> the engines running/ idle speed (white wire). Other than that I am not 
> sure what you are refering to. Please enlighten me as I am curious.
>
> Regards,
>
> NickT.





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