Removing a fuse to reset the ECU? - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

JRP · 09-13-2013, 05:37 PM

For Toyota's, you can remove the EFI fuse for 5 minutes to reset the ECU; is there a fuse on the 86 I can remove to reset the ECU? I'm hoping not to have to remove the negative cable from the battery. I searched but couldn't find anything on this site and my FR-S has 4 EFI fuses, and I'm not even sure removing all or some of them would reset the ECU. I want to reset the ECU because I put on a new catback and intake and feel it won't hurt to reset the ECU.

Hardrock4445 · 09-13-2013, 05:39 PM

The time it takes you to find that information, ou could have already removed and crossed the battery cables for 10 minutes, reconnect and be done.

onefitz · 09-13-2013, 05:42 PM

Just pull the negative.

Sportsguy83 · 09-13-2013, 06:08 PM

Quote:

Originally Posted by Hardrock4445

The time it takes you to find that information, ou could have already removed and crossed the battery cables for 10 minutes, reconnect and be done.

I guess if he plans on do it more than say 5 times, it will be worth finding the info out one time over removing bat. connector every time.

JRP · 09-13-2013, 06:13 PM

Actually I'm sitting at my desk at work so I have the time to wait to see if someone has the answer. I'm trying to avoid reprogramming the radio, syncing my phone etc. Pulling the negative takes more time than pulling a fuse.

Lytheum · 09-13-2013, 06:17 PM

the brz radio saves my settings when unhooking the battery. i do have to turn the gear indicator back on everytime though.

JRP · 09-13-2013, 06:43 PM

In looking at the wiring diagram found on this forum, it looks like the 7.5 amp EFI +B fuse is the one to pull which is the same for a Toyota. This runs from the battery directly to the BATT pin on the ECM.

Hardrock4445 · 09-13-2013, 08:14 PM

Yeah, only thing you loose is shift indicator and MPG counters. Which I believe you loose over fuse pull as well. But more power to you for figuring it out. I re read that post and it kind of sounds like it, but I wasn't being an ass. lol

JRP · 09-24-2013, 02:20 PM

Quote:

Originally Posted by Hardrock4445

Yeah, only thing you loose is shift indicator and MPG counters. Which I believe you loose over fuse pull as well. But more power to you for figuring it out. I re read that post and it kind of sounds like it, but I wasn't being an ass. lol

Just as a follow up on this; I pulled the fuse and it did do a reset and I didn't loose anything like mpg counters, etc. After the fuse pull, the first time I hit the key it didn't even crank, the second time it did. I ended up doing the fuse pull a second time because I did not idle the car for the recommended 5 minutes and the car was running pretty poorly. After the second time all was fine.

21_nola_05 · 05-15-2014, 04:47 PM

Quote:

Originally Posted by JRP

Just as a follow up on this; I pulled the fuse and it did do a reset and I didn't loose anything like mpg counters, etc. After the fuse pull, the first time I hit the key it didn't even crank, the second time it did. I ended up doing the fuse pull a second time because I did not idle the car for the recommended 5 minutes and the car was running pretty poorly. After the second time all was fine.

witch fuse did you pull exacly ? thx

calibrz · 05-15-2014, 06:26 PM

Quote:

Originally Posted by 21_nola_05

witch fuse did you pull exacly ? thx

just pull the negative cable, much easier. done it multiple times without any issues.

Sphirit · 05-16-2014, 05:01 AM

any issues with keyless entry sistem?

steve99 · 05-16-2014, 09:33 AM

What is actually achieved by resetiing ecu ?

Other than resetting DTC [cel codes] and a couple of counters like time since dtc reset and distance since dtc reset.

Fuel trims and knock learning parameters appear to be a continuous learning process so i am unsure what you guys reckon you are achieving by resetting the ecu.

As far as i can work out the ecu will learn as far as its parameters and limits allow on its current tune any changes that are made ie difference in fuel or small mods.

Yes resetting the ecu will set these parameters back to the default levels but they would 'learn' anyway, would it learn faster ? the ecu is monitoting parameters and learning all the time it never stops doing so.

watch the ecu learn differences in ethanol content on e85 tunes or it learn new timing when you put in 91 or 87 octane, unlikely resetting ecu will achieve much. It will learn this stuff in seconds.

Sellout · 05-16-2014, 10:33 AM

Quote:

Originally Posted by steve99

What is actually achieved by resetiing ecu ?

In a word, nothing.

09-13-2013, 05:37 PM	#1
JRP Senior Member Join Date: May 2013 Drives: 2013 Perl White FR-S Location: Federal Way, WA Posts: 100 Thanks: 34 Thanked 11 Times in 7 Posts Mentioned: 6 Post(s) Tagged: 0 Thread(s)	Removing a fuse to reset the ECU? For Toyota's, you can remove the EFI fuse for 5 minutes to reset the ECU; is there a fuse on the 86 I can remove to reset the ECU? I'm hoping not to have to remove the negative cable from the battery. I searched but couldn't find anything on this site and my FR-S has 4 EFI fuses, and I'm not even sure removing all or some of them would reset the ECU. I want to reset the ECU because I put on a new catback and intake and feel it won't hurt to reset the ECU. __________________ Jim

09-13-2013, 05:39 PM	#2
Hardrock4445 Senior Member Join Date: Aug 2012 Drives: 2013 Scion FR-S Location: Syracuse Posts: 719 Thanks: 274 Thanked 277 Times in 161 Posts Mentioned: 6 Post(s) Tagged: 0 Thread(s)	The time it takes you to find that information, ou could have already removed and crossed the battery cables for 10 minutes, reconnect and be done. __________________ Mods: Perrin CAI, JDL EL header, DC sports Catless front pipe, top speed auto pro-1 cat-back, H&R sport line springs, Headlight blackout, "Demon eyes"

09-13-2013, 06:13 PM	#5
JRP Senior Member Join Date: May 2013 Drives: 2013 Perl White FR-S Location: Federal Way, WA Posts: 100 Thanks: 34 Thanked 11 Times in 7 Posts Mentioned: 6 Post(s) Tagged: 0 Thread(s)	Actually I'm sitting at my desk at work so I have the time to wait to see if someone has the answer. I'm trying to avoid reprogramming the radio, syncing my phone etc. Pulling the negative takes more time than pulling a fuse. __________________ Jim

09-13-2013, 06:17 PM	#6
Lytheum Senior Member Join Date: Mar 2012 Drives: 2013 BRZ Premium 6MT Location: Ohio Posts: 427 Thanks: 49 Thanked 103 Times in 54 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	the brz radio saves my settings when unhooking the battery. i do have to turn the gear indicator back on everytime though. __________________ 2013 Subaru BRZ Premium 6MT -STOCK!

09-13-2013, 06:43 PM	#7
JRP Senior Member Join Date: May 2013 Drives: 2013 Perl White FR-S Location: Federal Way, WA Posts: 100 Thanks: 34 Thanked 11 Times in 7 Posts Mentioned: 6 Post(s) Tagged: 0 Thread(s)	In looking at the wiring diagram found on this forum, it looks like the 7.5 amp EFI +B fuse is the one to pull which is the same for a Toyota. This runs from the battery directly to the BATT pin on the ECM. __________________ Jim

09-13-2013, 05:42 PM	#3
onefitz Senior Member Join Date: Dec 2012 Drives: 13 GBS BRZ Location: LA Posts: 152 Thanks: 345 Thanked 112 Times in 59 Posts Mentioned: 5 Post(s) Tagged: 0 Thread(s)	Just pull the negative.

09-13-2013, 08:14 PM	#8
Hardrock4445 Senior Member Join Date: Aug 2012 Drives: 2013 Scion FR-S Location: Syracuse Posts: 719 Thanks: 274 Thanked 277 Times in 161 Posts Mentioned: 6 Post(s) Tagged: 0 Thread(s)	Yeah, only thing you loose is shift indicator and MPG counters. Which I believe you loose over fuse pull as well. But more power to you for figuring it out. I re read that post and it kind of sounds like it, but I wasn't being an ass. lol __________________ Mods: Perrin CAI, JDL EL header, DC sports Catless front pipe, top speed auto pro-1 cat-back, H&R sport line springs, Headlight blackout, "Demon eyes"

05-16-2014, 05:01 AM	#12
Sphirit Member Join Date: May 2013 Drives: GT86 Location: Spain Posts: 73 Thanks: 7 Thanked 6 Times in 4 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	any issues with keyless entry sistem?

05-16-2014, 09:33 AM	#13
steve99 Banned Join Date: Dec 2013 Drives: FT86 Location: Australia Posts: 7,996 Thanks: 1,035 Thanked 4,993 Times in 2,983 Posts Mentioned: 598 Post(s) Tagged: 2 Thread(s)	What is actually achieved by resetiing ecu ? Other than resetting DTC [cel codes] and a couple of counters like time since dtc reset and distance since dtc reset. Fuel trims and knock learning parameters appear to be a continuous learning process so i am unsure what you guys reckon you are achieving by resetting the ecu. As far as i can work out the ecu will learn as far as its parameters and limits allow on its current tune any changes that are made ie difference in fuel or small mods. Yes resetting the ecu will set these parameters back to the default levels but they would 'learn' anyway, would it learn faster ? the ecu is monitoting parameters and learning all the time it never stops doing so. watch the ecu learn differences in ethanol content on e85 tunes or it learn new timing when you put in 91 or 87 octane, unlikely resetting ecu will achieve much. It will learn this stuff in seconds.

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