A12 FANC not sending signal

s300 and SManager software questions & answers
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2x0
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Joined: Sat Feb 04, 2017 6:51 pm

A12 FANC not sending signal

Post by 2x0 »

I have been using my s300v3 in a p28 to control my fan via A12 signal from the ecu. Recently I am getting no voltage output from A12 even when Hondata shows that FANC is active. Any ideas what to check?

I updated the software and when trying to update USB drivers I get an error that it failed to update.
'91 CRX, B18c1, T3/T4, 17psi on e85, FIC 1000cc's, S300 V3 P28
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Spunkster
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Re: A12 FANC not sending signal

Post by Spunkster »

You do not need to update USB drivers, as they have nothing to do with this issue.

Are you using a relay to operate the fans?
2x0
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Re: A12 FANC not sending signal

Post by 2x0 »

Yes I am using a relay. I tested for a signal at the relay and also at the ecu and I got nothing.

It has worked okay for years and just suddenly stopped.
'91 CRX, B18c1, T3/T4, 17psi on e85, FIC 1000cc's, S300 V3 P28
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Re: A12 FANC not sending signal

Post by Spunkster »

If you use another output form the ecu using the aux outputs, does the relay work and turn on the fans when conditions are met? If the relay is bad then it may have damaged the ECU output.
2x0
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Re: A12 FANC not sending signal

Post by 2x0 »

The relay I had on it was bad and I replaced it. So I’m guessing that it damaged the output then.
'91 CRX, B18c1, T3/T4, 17psi on e85, FIC 1000cc's, S300 V3 P28
2x0
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Re: A12 FANC not sending signal

Post by 2x0 »

Is there a way to repair the output, or to know which components were damaged? Or will it require a new ecu.

Otherwise I will need to run the fan from a manual switch.
'91 CRX, B18c1, T3/T4, 17psi on e85, FIC 1000cc's, S300 V3 P28
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Spunkster
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Re: A12 FANC not sending signal

Post by Spunkster »

You can try and trace it to a components, but that could be very time intensive and may still not fix it. We do not repair ECU's so it is probably best to use a different ECU with the s300.
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