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barge

Link WRX sti 2004 PnP Voltage Supply

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Is there any way to supply a regulated 12V to the ECU so that it maintains comms connection during cranking without messing up all the VBatt type compensations in the ECU?

Even with a stock size battery I "think" i am getting too much voltage drop during cranking to maintain comms. Unless there is a good method of logging and trigger scoping in the ECU on it's own during a crank I'd like to remain connected during cranking.

I've seen some other threads about bad grounds, starter noise, etc. All the grounding is to stock points and there's not much I can do about the factory starter.

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Is this a new install or has it just started playing up?  Does it just drop comms or does it not start either?

 

14 hours ago, barge said:

Unless there is a good method of logging and trigger scoping in the ECU on it's own during a crank I'd like to remain connected during cranking.

You can set up ECU logging to record batt voltage so you can see whats going on during cranking without beieng connected.

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It's been running for a while. It has always dropped comms during a startup.

Now that it's cold I'm working on cold start and I'd like to check the trigger levels and such.

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