Engine Stops After Battery Disconnect

[TheGoat4R]

I have a 2020 ORP and, like everyone else, am busy installing lights, radios, etc. The first thing I do every time I start tearing into things is disconnect the negative battery cable. I've had the dash apart several times, removed the front seats, etc., so disconnecting power is always the first step.

What I've noticed is, every time I disconnect the battery - even if that's all I do - the engine stops after about 5 seconds after I put it all back together and fire it up. I can then immediately restart and it continues to run normally. Again, this happens even if I don't disconnect or work on any other systems. Simply disconnecting the battery causes it to happen.

Anyone else seeing this? Any idea what causes it? Should I be worried?

Thanks for your help

 

[justwoody1]

I/ve been disconnecting my battery four 4 years now and was assuming it was normal since mine does it every time. Probably got something to do with the ECU resetting.

 

[Sothras]

Yeah, it has done it every-time also. Normal?

 

[nb rob]

it does it every time you disconnect the battery. First startup dies.

totally normal.

 

[Rbrtito]

That’s normal on the 4 runner on the first start it dies but will start up problem on the 2nd try

 

[Nuke]

Yeah, it has done it every-time also. Normal?

I noticed the same when I installed my intake. It raised an eyebrow but nothing more, assuming the ECU had a case of "momentary stupid". Good to hear it's normal.

 

[Smitty19TRD]

Normal. Mine does it as well.

 

[Whippersnapper02]

Normal. My 2010 Tacoma did this as well.

 

[drewsro]

It's a Toyota thing. My wife's RAV4 did it when I changed the battery and my Corolla did it too when I had that.

 

[itr1275]

Yup. That's expected behavoir. I had it happen on my 2011 and saw in noted in my 2020 owners manual.

I will see if I can find it.

 

[Sky]

2019 Owner's Manual.>

■When recharging or replacing the battery

●The engine may not start on the first attempt after the battery has been recharged or replaced.
but will start normally after the second attempt. This is not a malfunction.

 

[itr1275]

Found it. Page 515.

https://www.toyota.com/t3Portal/document/om-s/OM35B54U/xhtml/OM35B54U.html?locale=en

●The engine may not start on the first attempt after the battery has recharged
but will start normally after the second attempt. This is not a malfunction.

 

[TheGoat4R]

Thanks

Thanks to all for clearing that up. Special thanks to itr1275 for the link to the owner's manual. Got that and a PDF copy tucked away for future reference.

Barry

 

[Run Forrest Run]

Thanks so much for this thread. Just had this happen for the first time on my 2020 ORP after BMC. All is good again!

 

[Lester Lugnut]

Pretty much all 5th Gens do this.

 

[patkelly4370]

Thanks so much for this thread. Just had this happen for the first time on my 2020 ORP after BMC. All is good again!

This.
I haven't disconnected my battery yet, but this thread will keep me from starting a new one.

Sent from my SM-G955U using Tapatalk

 

[amir_gh]

Same with my 2016 limited. I have disconnected my negative terminal twice. Engine stops on first attempt.

 

[Knuckl3dragg3r]

Bless you guys for starting threads like this, haha. Just did a terminal swap to the SDHQ ones... something super simple, checked the leads and grounds three times before firing it up and had this happen. Heart about jumped through my throat. Killed it, tried again and it fired up no problem (as designed apparently) and this thread was the first thing I found immediately after. Never had another vehicle do that, not that I'm a regular wrencher...