are there two TPS? I did the diagnosis on my SC4 and got 41 and 47, which i have read is the TPS and sub TPS. so does that mean there are two?
I also got 27 and 29, which are two (both sub O2 sensors) of the 4 O2 sensors, so this leads me to believe there may be more than one TPS. But I don't see where there is another one aside from the throttle body mounted one. Thanks. I'm new to the SC world so any help, would help haha.
I believe if you have traction control, you'll have 2 tps's.
Yes I went through a TPS issue a few months ago and the code 41 is for your main TPS---the throttle one--and the other is for your trac control.
Now I am not a mechanic at all----but I find it hard to beliebve both of your TPS's failing at the same time-----take my advice on this please---dont make the same mistake I did-----get your car properly diagnosed at a good mechanics----preferably the dealer if you can afford it.
I replaced my tps because my car was throwing a code 41--that didnt work so i replaced the ecu---that didnt work--i replaced the battery---nothing----finally i left my car at my mechanics and asked him to please find the issue---------it was a loose plug on my cam sensor
By the end of it my car was throwing codes 12-13-41.
Good luck
You may have an underlying issue which is causing your car to throw all these codes.
I replaced my tps because my car was throwing a code 41--that didnt work so i replaced the ecu---that didnt work--i replaced the battery---nothing----finally i left my car at my mechanics and asked him to please find the issue---------it was a loose plug on my cam sensor
By the end of it my car was throwing codes 12-13-41.
Good luck
You may have an underlying issue which is causing your car to throw all these codes.[/QUOTE]
What issues were you having with your car?
Is there a difference between the two sensors ? If I were to switch there places would it work the same ? I have a Lexus sc400 and it runs better with the sub tps unplugged so I think it needs to be replaced and I can’t pull any codes with a scanner because ecu won’t communicate.
If they have different part numbers on the TPS sensors then they will be calibrated to output different resistance values from each other. The 2JZ-GE and 2JZ-GTE engines also have a main TPS sensor and a sub-TPS sensor for TRAC functions and their ECUs don't like it when the two sensors are swapped (I've tried).
I admittedly have not owned an SC400 and tried the same but after trying it with a JZ engine I don't think it will.
If you have a pre-1996 SC400 then you will not be able to pull OBD2 codes since the car never was designed for that standard. If you have a 1996+ SC400 you may be able to pull OBD2 codes with a scanner but it's first generation early OBD2 so there may or may not be compatibility with every OBD scanner tool.
For 1992-1995 SC300/400's you have to take a paperclip, bend it and connect terminals TE1 and E1 on the gray diagnostic port under the dash with the ignition turned to the ACC position. Then you will be able to count the number and pattern of flashes in order to obtain the appropriate two-digit CEL error codes... if any are present.
If they have different part numbers on the TPS sensors then they will be calibrated to output different resistance values from each other. The 2JZ-GE and 2JZ-GTE engines also have a main TPS sensor and a sub-TPS sensor for TRAC functions and their ECUs don't like it when the two sensors are swapped (I've tried).
I admittedly have not owned an SC400 and tried the same but after trying it with a JZ engine I don't think it will.
If you have a pre-1996 SC400 then you will not be able to pull OBD2 codes since the car never was designed for that standard. If you have a 1996+ SC400 you may be able to pull OBD2 codes with a scanner but it's first generation early OBD2 so there may or may not be compatibility with every OBD scanner tool.
For 1992-1995 SC300/400's you have to take a paperclip, bend it and connect terminals TE1 and E1 on the gray diagnostic port under the dash with the ignition turned to the ACC position. Then you will be able to count the number and pattern of flashes in order to obtain the appropriate two-digit CEL error codes... if any are present.
This helps a lot thank you, any chance you might know where I could find a new sub tps, I’ve been trying to search for it but all I get is the main one.
This helps a lot thank you, any chance you might know where I could find a new sub tps, I’ve been trying to search for it but all I get is the main one.
I think you're looking for P/N 89452-50010 or its superseded number 89452-50020 although the original OEM part may be discontinued. Try looking for a used one or try looking up the sub-TPS resistor trick (if you want to disable TRAC function altogether) on Supraforums since it should work the same way given the similarity of the TRAC-TPS sensors.
I think you're looking for P/N 89452-50010 or its superseded number 89452-50020 although the original OEM part may be discontinued. Try looking for a used one or try looking up the sub-TPS resistor trick (if you want to disable TRAC function altogether) on Supraforums since it should work the same way given the similarity of the TRAC-TPS sensors.
In case it is not clear to anyone else researching this, not all cars have the sub-TPS. I have the Lexus manual for my year car (1993 SC300), and in the shop manual it refers to both the TPS and sub-TPS, almost like you should expect to have both. You have to read carefully, but like mentioned above, unless your car has the Traction Control option it will not have a sub-TPS.
