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ok, some breakdown
Posted by Siegfried (more from Siegfried) on Fri, 18 Mar 2011 11:07:33
In Reply to: Re: if you've got a good known ECU - try it 1st (n/m), imagesinthewind, Thu, 17 Mar 2011 16:53:18
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Images,
It is the EFI (fuel management) ECU that runs Shift Up control light. Given the fact of other performance issues I'd start with that ECU swap if you don't special tools to trace its inputs and outputs.
Another thought: it can be RPM input (RPM hall sensor by the crankshaft pulley -> EZK (ignition) ECU -> EFI ECU) that fools your Jetronic ECU about current engine RPM value, but as far as I know there must be a special bit set in ECU ROM to enable Shift Up light functionality - and with your particular setup this bit is to be in the 'disabled' state - so ECU failure looks the most probable for me.
Good luck,
Zig
posted by 77.37.1...
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