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Discussion Starter · #1 ·
Probably looking for an answer from CharlieX. Is there an easy way to determine if the ECU remains "on" after engine shut down.
Michael
 

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Discussion Starter · #3 ·
Charlie, here is exactly what and why I am asking.
In excess of 190'F at engine shut down the ECU remains active to monitor for temperatures in excess of 230'F to turn on the re-circulation pump. I want to know if the ECU has reached the 190'F set point and remains on so that I know there could be a chance that the re-circulation pump will kick in. I have a shut off valve in the heater supply and if the ECU is still on I will open that valve, if not I can leave it closed.
Michael
 

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Discussion Starter · #5 ·
Since there is only one engine temperature sensor for all functions I would conclude that if the dash temp readout displays under 190'F the ECU would turn off and there could be no chance of the Re-circ. pump coming on. Over 190'F on the readout means the ECU is on. Would you agree?
Michael
 

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Discussion Starter · #7 ·
I was not sure if the displayed temp was the same as the ECU used for its threshold.
Two engineers comunicating can be tough ;-)
Yep i think we're saying the same thing, if the temp's are above the threshold for the recirc pumps, the ecu stays on, but if they're not it turns off after 15 or so seconds.

There would be no point staying on and monitoring temps at low temps for it to reach 230F since that'd be impossible.

it'll stay on for about 20 minutes at most.
 

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Discussion Starter · #9 ·
With the engineer mentality I am never comfortable unless there is proof. I wish there could be an LED that would indicate ECU is powered. Some how I don't trust that just because the temp. shows 189 the ECU is off or at 191' it is on:shrug:
 

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Discussion Starter · #11 ·
That would be very helpful, thanks
totally agree on that one, its problematic for me because its possible to get the ecu into a state where you can't turn it off without disconnecting the battery.

i'm not by my bench ecu but when i am i'll see whats lit up when its on.
 
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