Hondata

Try your ECU/s300 in a known working car and see if the AIT error persists, if it does then it is most likely a faulty ECU. Start there and once you have eliminated the error code see if that resolves the other issues you are having.

Been there done that, no errors in other cars, and as I said ...

in 2 of the datalogs you also have a knock sensor error even though the calibration shows you have this error disabled, which to me indicates this is not the calibration these datalogs were made with.

You will need to resolve both of these errors before doing anything else.

You are right on the ...

First you need to resolve the IAT error which could be a wiring fault, or a damaged ECU.

Second you need to look at your grounds as it sounds like it is grounding through the VTEC solenoid and that is why it fails when VTEC activates.

thanks for the quick answer...

I highly doubt there is a ...

Hello there

Im having a VERY strange issue with an Hondata S300 in a B18 integra. Car has worked fine for quite a few time, but some weeks ago, for no reason at all, the ecu completely cuts off the injectors and the spark (you can see the 0.0ms) at the point where the VTEC comes in. The ECU does ...