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Low volts
Posted: Sun Nov 05, 2017 6:48 pm
by Unocam
Hello everyone i had a question that i can not find concerning my hondata s300 v2. My issues is according to smanager my battery is showing anywhere from 3 to 7 volts, from my battery i read 13 volts on my multimeter. I just had the battery and the alternator tested both are good. I also checked my grounds i have a total of 4 now. This issue is causing my car to just want to just die it might idle at less then 1000 rpms. And run really rich according to my wideband. Please help me id really appreciate the help.
Re: Low volts
Posted: Mon Nov 06, 2017 12:21 pm
by Spunkster
Have you used a multimeter to check the voltage at the ECU pins?
Re: Low volts
Posted: Mon Nov 06, 2017 12:54 pm
by Unocam
Yeah it reads 12.4 on pin a25. I have a video of the smanager showing the battery voltage going crazy.
Re: Low volts
Posted: Mon Nov 06, 2017 12:59 pm
by Unocam
Re: Low volts
Posted: Mon Nov 06, 2017 1:58 pm
by Spunkster
Can you post the calibration used as well as a datalog showing the issue.
Re: Low volts
Posted: Mon Nov 06, 2017 3:27 pm
by Unocam
Re: Low volts
Posted: Mon Nov 06, 2017 4:59 pm
by Unocam
I also just put the ecu in another car with a stock p28 calibration and got the same low voltage at 7.9 volts on smanager. Could the ecu board itself gone bad?
Re: Low volts
Posted: Mon Nov 06, 2017 5:37 pm
by Spunkster
You should try your s300 in a different ECU to see if it is the ECU that is the problem. Also is J12 cut on the ECU?
Re: Low volts
Posted: Mon Nov 06, 2017 7:34 pm
by Unocam
That is my next step is to try another ecu. And yes j12 is removed. Thank you for all your help
Re: Low volts
Posted: Tue Nov 07, 2017 10:36 pm
by Unocam
Final update i replaced the ecu and had my s300 implanted in a new p28 and its fixed now i guess a capacitor or something went bad. They are 20 year old ecus