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3rdgenls1

How to tell it ecu is fried

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I have a question, I had my car parked since December and installed my battery(new) went to start but noticed few things

1) the fan relay is clicking and the fan is rotating super slow

2) The fuel pump is not priming 

3) and the car does not start 

Does this indicate my ecu is bad 

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Could just be a low voltage supply issue to the ECU or the main fuse to the ECU is blown..

Check the power supply and grounds to the ECU and see what you have there.

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Battery is at 12.65 sitting and 10.21 crank ruffle

It was perfectly fine when i parked it then i go to pull it out of my garage since sitting for a few months and all these issues

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To see if the ECU is powering up check for the LED on the board turning on. Is it a plugin or a wirein? What application?

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Lift the lid on the ECU and look for the green LED this should light at key on if not it most likely not getting power.

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It is lighting up but it flashes, insink with the fan relay. Its definitely getting power, i replaced the fan relay, and im going to get a new main relay and see if its that.

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Hi,

10.21 volts cranking is getting low.

Are you reading that voltage with a multi meter at the battery or on your laptop under RUNTIME VALUES.

If you are reading that voltage at the battery the voltage at the ECU will be lower and it will not connect to your laptop.

Try putting a charger on the battery, turn the ignition on, do not try to start it, see if the relay still clicks, check if you are able to connect the ECU to your laptop.

Make sure your charger has at least 4 amps plus.

If not use another battery or vehicle with jumper leads.

Regards

Dave.

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5 hours ago, 3rdgenls1 said:

Thanks, got find out why it corroded like that its only 1 years old.  

It doesn't take long for that to happen if it's in a humid environment, moreso if it's located somewhere that gets hold/cold on a regular basis.

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