Questions about adjusting the sub TPS
03-30-16, 04:58 PM
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Questions about adjusting the sub TPS
Hi all,
I have a 1991 LS400 w/ Trac that's throwing a code 47. The sub throttle TPS's connector was broken so I went ahead and ordered another one. I replaced it, but info for adjusting the trac tps is scant. I've played with a few different positions, but no joy in getting the code to clear.
Does anybody know the correct procedure for adjusting it?
I have a 1991 LS400 w/ Trac that's throwing a code 47. The sub throttle TPS's connector was broken so I went ahead and ordered another one. I replaced it, but info for adjusting the trac tps is scant. I've played with a few different positions, but no joy in getting the code to clear.
Does anybody know the correct procedure for adjusting it?
03-31-16, 12:35 PM
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Yes, I've pulled the negate cable multiple times. The motor falls on its face when you stab the throttle, not sure if they're related, but I want to take care of the issue that's causing the money light first.
03-31-16, 01:35 PM
#4
These links may have additional info:
http://www.lexls.com/tutorials/EFI/tps.html
http://www.lextreme.com/forums/showthread.php?t=7089
http://www.lexls.com/tutorials/EFI/tps.html
http://www.lextreme.com/forums/showthread.php?t=7089
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Heretic (03-16-21)
03-31-16, 01:53 PM
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Thanks for the links. I've read them before, seems that code 47 isn't a common issue, not a lot out there.
I think I'm going to swing by the local indy Toyota/Lexus shop with some pizzas and bounce ideas off of them.
I think I'm going to swing by the local indy Toyota/Lexus shop with some pizzas and bounce ideas off of them.
04-01-16, 11:40 AM
#6
Okay quick check of manuals, not much at all about install and adjustment so there could be a tsb on it I don't know. It basically says its the same as the main tps, but there is a adjust screw for idle stop on the main and not the sub at least I don't think so, I will study things better in a few days when I can.
To set the main tps it says you use a .016 thickness gauge between the stop and the adjust screw and use an ohm meter between terminals IKL and E2 on the tps, you turn it clockwise till you see it go to continuity , and tighten the screws .026 is suppose to open the switch.
The thing is with the sub tps, you need to know for sure what opening the sub throttle is at before you adjust it.
I'll check it all out better when I can as I want to know for sure how to do it as well.
Sometimes the manual is not easy to understand, I will need to try the adjustments to see for sure what is going on.
To set the main tps it says you use a .016 thickness gauge between the stop and the adjust screw and use an ohm meter between terminals IKL and E2 on the tps, you turn it clockwise till you see it go to continuity , and tighten the screws .026 is suppose to open the switch.
The thing is with the sub tps, you need to know for sure what opening the sub throttle is at before you adjust it.
I'll check it all out better when I can as I want to know for sure how to do it as well.
Sometimes the manual is not easy to understand, I will need to try the adjustments to see for sure what is going on.
Last edited by dicer; 04-02-16 at 01:10 AM. Reason: better description of how to
03-16-21, 09:30 AM
#7
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Okay quick check of manuals, not much at all about install and adjustment so there could be a tsb on it I don't know. It basically says its the same as the main tps, but there is a adjust screw for idle stop on the main and not the sub at least I don't think so, I will study things better in a few days when I can.
To set the main tps it says you use a .016 thickness gauge between the stop and the adjust screw and use an ohm meter between terminals IKL and E2 on the tps, you turn it clockwise till you see it go to continuity , and tighten the screws .026 is suppose to open the switch.
The thing is with the sub tps, you need to know for sure what opening the sub throttle is at before you adjust it.
I'll check it all out better when I can as I want to know for sure how to do it as well.
Sometimes the manual is not easy to understand, I will need to try the adjustments to see for sure what is going on.
To set the main tps it says you use a .016 thickness gauge between the stop and the adjust screw and use an ohm meter between terminals IKL and E2 on the tps, you turn it clockwise till you see it go to continuity , and tighten the screws .026 is suppose to open the switch.
The thing is with the sub tps, you need to know for sure what opening the sub throttle is at before you adjust it.
I'll check it all out better when I can as I want to know for sure how to do it as well.
Sometimes the manual is not easy to understand, I will need to try the adjustments to see for sure what is going on.
After looking at this form I'm motivated to test the distributor caps for continuity and the sub throttle sensor.
I have the Maintenance/Repair manual for a 96 LS400 and will dig through it today for some more info regarding the Sub TPS. I'll get back on here with my findings. However, if anyone has had success in testing the Sub TPS, let me know before i painstakingly go through the manual for some more info
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