3rdgenls1 Posted June 17, 2019 Report Share Posted June 17, 2019 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 Quote Link to comment Share on other sites More sharing options...
Simon Posted June 17, 2019 Report Share Posted June 17, 2019 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. Quote Link to comment Share on other sites More sharing options...
3rdgenls1 Posted June 17, 2019 Author Report Share Posted June 17, 2019 Ok i will Quote Link to comment Share on other sites More sharing options...
3rdgenls1 Posted June 17, 2019 Author Report Share Posted June 17, 2019 Forgot to add that i am not able to connect to the ecu and still cant Quote Link to comment Share on other sites More sharing options...
Richard Hill Posted June 17, 2019 Report Share Posted June 17, 2019 What's the voltage across the battery terminals with ignition on and then cranking? Quote Link to comment Share on other sites More sharing options...
3rdgenls1 Posted June 18, 2019 Author Report Share Posted June 18, 2019 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 Quote Link to comment Share on other sites More sharing options...
Simon Posted June 18, 2019 Report Share Posted June 18, 2019 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? Quote Link to comment Share on other sites More sharing options...
3rdgenls1 Posted June 18, 2019 Author Report Share Posted June 18, 2019 Its a plugin i have a Honda obd1 Quote Link to comment Share on other sites More sharing options...
Simon Posted June 18, 2019 Report Share Posted June 18, 2019 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. Quote Link to comment Share on other sites More sharing options...
3rdgenls1 Posted June 21, 2019 Author Report Share Posted June 21, 2019 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. Quote Link to comment Share on other sites More sharing options...
Dave Kriedeman Posted June 21, 2019 Report Share Posted June 21, 2019 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. Quote Link to comment Share on other sites More sharing options...
3rdgenls1 Posted June 21, 2019 Author Report Share Posted June 21, 2019 I took apart the main relay and this is what i found So tomorrow ill get a new one. Quote Link to comment Share on other sites More sharing options...
Dave Kriedeman Posted June 22, 2019 Report Share Posted June 22, 2019 Hi, Yep that'll do it. Good find. Regards Dave. Quote Link to comment Share on other sites More sharing options...
3rdgenls1 Posted June 22, 2019 Author Report Share Posted June 22, 2019 Thanks, got find out why it corroded like that its only 1 years old. Quote Link to comment Share on other sites More sharing options...
Monsterbishi Posted June 22, 2019 Report Share Posted June 22, 2019 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. Quote Link to comment Share on other sites More sharing options...
3rdgenls1 Posted June 27, 2019 Author Report Share Posted June 27, 2019 Ya, that is my assumption hot and cold temperature changes. Quote Link to comment Share on other sites More sharing options...
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