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ECU's and Electronics
Vettech:
Definitely not Corvette related, however, this concerns ECU in Fords.
Had an ˋ03 BA Fairmont since ˋ06, only complaint is that it eats headlight bulbs like lollies.
Recently car cuts out and engine stops, this occurs stopped at idle, reversing in the carpark or at 110 down the highway.
Alt is located under a coolant hose and the Power steering pump/switch and hoses etc.
All of these have leaked thru the Alt, plus grease, oil, road grime etc etc. The charge voltage goes from 14.5 up and up, car cuts out at ˜23Volts.
Problem has become VERY bad, suspected the Alt - so I fitted a new one, everything looked ok. The old Alt internals were something to behold.
Put a meter on battery but alas, somethig is driving the Alt output up and up, car cuts out.
This scenerio may now explain why the light bulbs are blowing. In the past I have measured the volts across the battery, 14,5 is a bit high, but not excessive.
I have done this may times and never seen this sudden voltage rise - I hate intermittent faults.
QUESTION. Anyone had a issue like this?
Is it safe to assume its the ECM?
Anyone heard of the cause being Electrolitic Caps in the ECM being at fault?
Iˋm at the point where I pull the ECM apart, or take it to Ford or similar to fix it - by the way Ford Tech Dept could not give me even a clue, but want to charge $100 per hour to see if they can locate the fault..
Any ideas or info would be greatly appreciated. Tks.
stingray:
Hi Doug, the $100/hour is good for the apprentice to learn on, try a same model ford blog and see what info you may get from owners, good luck
bfit:
Ford ECU now that could be contradiction in terminology for the uninformed.
Ford ECU =Error Correction Unit
Buy a Chev , all sorted
Bfit
bfit:
--- Quote from: Vettech on September 21, 2018, 12:35:26 PM ---Definitely not Corvette related, however, this concerns ECU in Fords.
Had an ˋ03 BA Fairmont since ˋ06, only complaint is that it eats headlight bulbs like lollies.
Recently car cuts out and engine stops, this occurs stopped at idle, reversing in the carpark or at 110 down the highway.
Alt is located under a coolant hose and the Power steering pump/switch and hoses etc.
All of these have leaked thru the Alt, plus grease, oil, road grime etc etc. The charge voltage goes from 14.5 up and up, car cuts out at ˜23Volts.
Problem has become VERY bad, suspected the Alt - so I fitted a new one, everything looked ok. The old Alt internals were something to behold.
Put a meter on battery but alas, somethig is driving the Alt output up and up, car cuts out.
This scenerio may now explain why the light bulbs are blowing. In the past I have measured the volts across the battery, 14,5 is a bit high, but not excessive.
I have done this may times and never seen this sudden voltage rise - I hate intermittent faults.
QUESTION. Anyone had a issue like this?
Is it safe to assume its the ECM?
Anyone heard of the cause being Electrolitic Caps in the ECM being at fault?
Iˋm at the point where I pull the ECM apart, or take it to Ford or similar to fix it - by the way Ford Tech Dept could not give me even a clue, but want to charge $100 per hour to see if they can locate the fault..
Any ideas or info would be greatly appreciated. Tks.
--- End quote ---
You know and uncontrolled alternator can do a 100V, that will fry most boards.
Vettech:
Thanks Alan, yes I've tried lots, rang experts, including Ford and other private companies specialising in ECU repair.
I get conflicting statements, BUT none can emphatically confirm that the ECU controlls the Alt output.
I found my Autel AL519 Can/OBDII decoder, and put it on the car, says no Codes, did all sorts of checks - nothing, but I have an Airbag/restraints light lit on the dash, and I know its in the yellow connector under the drivers seat, Soool!?!....
Bates the following questions.
1. Why does the ECU not know of the seat belt light.
2. Does the ECU actually controll the Alt output.
3. The two wires (smaller) to the Alt - what do they actually do!?!?.
Ahhhhhhhh!.... tomorrow I think I'll be looking for a circuit diagram, maybe a call to Bosch or the like.
Pity we dont have an Auto Electrician in the club??...........
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