code 51/ quits when returning to idle

professorbob · 01-31-2012, 07:02 PM

Thanks for the Link, I will check out the HAC High Altitude Control values.
After extensive reading at this site www.autoship101.com I learned there is a relation with the brake light switch and the engine control.
I have a panel light that indicates there is a problem with the brake lights.
Just wondering if you know which fuse controls the brake light circuit so I can remove it.
Am thinking that the ECU may be affecting the fuel cutoff because it thinks that the brakes are being applied.

I plan on purchasing a replacement Throttle position sensor as well because of the fact that it is out of spec. I am hoping this will also improve the starting on first try rather than the present 4- tries.
Thanks for you help.
Robert

cre · 01-31-2012, 09:04 PM

The brake fuel trim is VERY minimal and is reliant on other sensor data from what I recall.... Otherwise, brake-boosting would be impossible in these cars but it's actually VERY easy.

Do keep in mind that those publications cover MANY years and many years of changes and evolution. A lot of it has no relevance with regard to TCCS and earlier systems.

gtgassman · 10-06-2016, 12:21 PM

Hi guys new to this forum, any update on this my son and I have been restoring a 1989. We had the head straightened and machined and a valve job done on it, reassembled the motor and are having the same issues that professerbob was having. Won't rev over 2500. changed the MAF and the TPS no vac leaks and no codes. I am going to check the grounds, but any other thoughts would be appreciated. My son is an eleventh grader in automotive tech and this has the teacher confused. Thanks

01-31-2012, 07:02 PM	#1
professorbob Intake Join Date: Nov 2007 Location: Lavonia Posts: 49	Engine Stopping update Thanks for the Link, I will check out the HAC High Altitude Control values. After extensive reading at this site www.autoship101.com I learned there is a relation with the brake light switch and the engine control. I have a panel light that indicates there is a problem with the brake lights. Just wondering if you know which fuse controls the brake light circuit so I can remove it. Am thinking that the ECU may be affecting the fuel cutoff because it thinks that the brakes are being applied. I plan on purchasing a replacement Throttle position sensor as well because of the fact that it is out of spec. I am hoping this will also improve the starting on first try rather than the present 4- tries. Thanks for you help. Robert

01-31-2012, 09:04 PM	#2
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	The brake fuel trim is VERY minimal and is reliant on other sensor data from what I recall.... Otherwise, brake-boosting would be impossible in these cars but it's actually VERY easy. Do keep in mind that those publications cover MANY years and many years of changes and evolution. A lot of it has no relevance with regard to TCCS and earlier systems. __________________ If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar --->

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10-06-2016, 12:21 PM	#3
gtgassman Stock Join Date: Oct 2016 Location: Ct Posts: 1	Hi guys new to this forum, any update on this my son and I have been restoring a 1989. We had the head straightened and machined and a valve job done on it, reassembled the motor and are having the same issues that professerbob was having. Won't rev over 2500. changed the MAF and the TPS no vac leaks and no codes. I am going to check the grounds, but any other thoughts would be appreciated. My son is an eleventh grader in automotive tech and this has the teacher confused. Thanks