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Author Topic: Lost power. Ecu not turning on  (Read 661 times)
dilly
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« on: April 02, 2019, 05:07:25 AM »

Was driving to work a few minutes ago and car shut off. Check engine light does not illuminate either. I checked the engine control fuses and those check out. Also changed the ecu on the side of the road and nothing..
04 Jetta gli 1.8t
Ecu isn’t turning on so I can’t check codes....
Any ideas?
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adam-
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« Reply #1 on: April 02, 2019, 05:19:27 AM »

Relay?
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dilly
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« Reply #2 on: April 02, 2019, 05:26:07 AM »

Relay?
Well shit. Didn’t think of that on the road in this freezing temp.
Got a ride to work guess I have to wait now and see and try my spare relays I have from the other parts cars
Thanks for the input man
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Risky
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« Reply #3 on: April 02, 2019, 06:33:46 AM »

Check your battery connections...may sound stupid but I've had this happen to me at a red light. Had changed the battery two weeks prior, connection had just come loose for the negative terminal. Tightened it and was on my way. Other than that, I agree with Adam about the relay.
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dilly
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« Reply #4 on: April 02, 2019, 03:21:22 PM »

To get off the side of the road I jumped the relay from the sai hot wire and the car runs
Changed the relay under the dash and still nothing. I get continuity on the ground signal wire for the relay to the ecu

There is no voltage on the two 12v wires for the main relay unless obviously if I jump it to a battery hot

I’m out of ideas
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adam-
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« Reply #5 on: April 02, 2019, 11:52:31 PM »

It's the relay in the bay.
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dilly
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« Reply #6 on: April 03, 2019, 09:25:46 PM »

It's the relay in the bay.
i bought a new relay from vw and changing that by itself didn't do anything.
checked the fuses with a volt meter in continuity mode  blah blah nothing.
took every fuse from a know working parts car and swapped them over and now the car turns on fine etc.
BUT
odd thing is that i think the EPC light is supposed to stay illuminated when key is on. when i turn the key to the on position, it blinks quick then turns off(blinks as in turn on for a split second then shuts off)
can someone verify this for me?
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cessnas
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« Reply #7 on: April 04, 2019, 03:55:28 AM »

The ESP, EML and Traction controll lights are controlled by the ECU if i remember correctly. Why not just measure with on multimeter if the ECU is getting power?
Might be water ingress into the ECU aswell thats causing the problems
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dilly
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« Reply #8 on: April 04, 2019, 01:00:09 PM »

Ecu gets power.. car runs and no errors.
I’m just concerned as to why the epc light just flashes quick instead of staying on when key on
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dilly
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« Reply #9 on: April 04, 2019, 04:02:06 PM »

Interesting outcome here. Decided to make a few changes to my file and reflashed. Epc light now stays on solid with key on like it is supposed to. I guess consider this problem solved?
Weird behavior
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adam-
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« Reply #10 on: April 04, 2019, 11:53:12 PM »

So, what did you change?
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dilly
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« Reply #11 on: April 05, 2019, 10:40:08 AM »

My changes weren’t influenced by this issue
Just made some changes regarding readiness.
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