ECU reset

**suede** · 10-11-2010, 10:35 PM

simple question that i can not find the answer to....

whats the best way to reset the ECU....

cars gas milage has went to shit, found out the trans shop put a o2 wire over a header and melted through that so it runs wicked rich and killed the o2s so i got a new harnes and o2s to go in here shortly, and figured itd pry be best to just reset the ecu while i was at it... I believe the easiest way is to unhook the battery for awhile, but i also remember something about pulling a fuse and a sequence that went with it all

**Smittro** · 10-12-2010, 04:43 AM

Sup Wade! I've always just disconnected my batt then a full warm up idle. Maybe someone will chime in on the fuses.. Subscribed...

**Cutlass** · 10-12-2010, 05:19 AM

You can reset the fuel trims with a scan tool or HPtuners.

**Smittro** · 10-12-2010, 06:50 AM

Originally Posted by Cutlass

You can reset the fuel trims with a scan tool or HPtuners.

Will idle relearn not work?

**suede** · 10-12-2010, 08:50 AM

Originally Posted by Smittro

Will idle relearn not work?

this....

i figured this would sorta reset most all that jazz

**pajeff02** · 10-12-2010, 09:00 AM

I had to re-set my LTFT's manually with HP Tuners.

**98TransAmWs-6** · 10-12-2010, 10:45 PM

I believe you can pull the PCM and BAT fuses for 5 minutes and it resets the ecu. I did it this way when I was cleaning my MAF and I forgot to plug it back in before I started my car again.

**Smittro** · 10-13-2010, 04:24 AM

Originally Posted by suede

this....

i figured this would sorta reset most all that jazz

Same here.. Tho I'm a v6 I'm still obdII.. This is honestly the first time I've heard about needing a scanner or tuner software after (I have 2 front 02's too) changing front 02's.

**Smittro** · 10-13-2010, 04:32 AM

Originally Posted by 98TransAmWs-6

I believe you can pull the PCM and BAT fuses for 5 minutes and it resets the ecu.
I did it this way when I was cleaning my MAF and I forgot to plug it back in before I started my car again.

Except for the fuses part (new to me), I've just discon the batt few times myself..

I fired it up once and left a couple things unpluged.. Ran like D*CK!

After scratching my head for a minute I shut it down and looked it over..

Pluged in the sensors and was back in business..

However the ECM had logged the mistakes and I then had the codes cleared.

For the rear 02. I just let it reset on it's own which it will do after so many startup and shut down's..

**suede** · 10-15-2010, 09:58 PM

well i was really hoping not to screw up the new o2s but i guess, ill give the pcm fuse and batery trick a try and see where it gets me

**RyanJM** · 10-15-2010, 11:35 PM

I have always just disconnected the vary for a few min then let it warm up and go put 50 miles on it and it should relearn everything, has worked on all my other cars and my TA when I had to replace the maf.