ECU reset after AFM change

**JetspeedCamry** · 29-05-2006, 04:26 PM

Just wondering, when swapping an AFM to another, is it necesary to reset the ECU for it to run correctly?

Thanks!

**Hydra** · 29-05-2006, 04:32 PM

It can't hurt. I would imagine that the ECU could have "learnt" the old AFM and the new AFM may differ slightly. But then, it may compensate for the changes anyway.

The only way to tell is to try it for yourself

**1200det** · 29-05-2006, 04:33 PM

usually a good idea to disconnect the battery when unplugging electricals like the AFM and in turn this will reset the ECU anyhow , So why not hit 2 birds with 1 stone

essentially no you wouldnt need a ECU reset if its a standard AFM replacement , but saying that a ECU reset and learn is always a good idea every now and then anyhow.

.

**JetspeedCamry** · 29-05-2006, 04:38 PM

Ok. Thanks guys. Ill reset it, via battery disconnect

**Mr Revhead** · 30-05-2006, 07:13 PM

so why does a factoru ecu need to be reset?
i have yet to EVER see any proof its needed or makes any difference.

they are made to run within rather limited parameters. if they could "learn" why do we need aftermarket ecus?

**Hydra** · 30-05-2006, 07:21 PM

They have to be able to compensate for variables like fuel, air temp etc. These are dynamic so the ECU must change the timing etc to compensate.

Every time I have reset the ECU, my idle jumps up just past 2000 on the first start, while afterwards it does not.

Above all else, an ECU reset is to remove the error codes