engine shutoff on initial start

I have a curious problem I've noticed.
If I disconnect the ground wire to the battery, then reconnect it, something weird happens.
On the initial startup the truck turns on, but 2 seconds later just shuts off. The second startup after that is completely normal and it runs fine.
I was curious if there was some sort of safety mechanism at play on the 2011, or the system is resetting or something. I can reproduce the problem so it wasn't a one time thing.

Has anyone heard of this?

 

Maybe looking for minimum battery voltage to run? Could be a 'two time test' thing?

 

Mine has a hard time starting right after I disconnect the battery. Try turning the key to "on" for a few seconds before you actually start it.

 

my 07 would do the same thing.

 

ive had this problem maybe 10 times over the last year and a half if it doesn't start quick i shut back off and retry fires up everytime. Dont know what the deal is though...

 

Power to ECU? ECU runup?

 

after you disconnect the battery?

i have a pretty good guess based on experience with flashing other japanese vehicle ecus...

throttle by wire requires the throttle body to calibrate itself. several other make vehicles require 10 seconds with the key ON, but engine not started, for the TB to calibrate itself after a battery disconnect. otherwise, i guess, the TB will try to calibrate while running and this can cause a stall condition.

i've actually heard the rotary throttle body actuator move on other vehicles during this process.

 

i got the same problem. i've been dealing with it for the past couple months. i just turn it to the "on" position and wait a few seconds.

 

Probably has something to do with a fuel pump safety cutoff. There's probably a relay that whenever power is inturrupted the key needs to be cycled through once. Totally just a guess though.

RZ Rob

 

At least I am not alone with this situation.
I was surprised there was no mention of this in the manual, especially since disconnecting the battery is such a common thing.

I may ask the local dealership mechanic who is a reasonable guy, see what he knows about this.

 

Whenever you disconnect the battery, the ecu has to reset and recalibrate. I'd be more worried if it didn't cut off at initial start or at least have really high idle.