Throttle position sensor.

by **Midias** » Mon Aug 08, 2005 12:44 pm

Is there a way to adjust the TP sensor because according to the OBD2 readout when I have it floored it only reads 76% open.

by **JoeB** » Mon Aug 08, 2005 6:46 pm

Actually, if you look in the manual, 75% is correct. -JoeB

by **Midias** » Mon Aug 08, 2005 8:04 pm

Thanks I am glad to hear it is where it should be.
Would it be worth it from a performance stand point to try to make it hit 100%

by **Fletch** » Tue Aug 09, 2005 4:03 am

My TPS threw a CEL and was not responding/slow to respond several months back. The new one would only open up to 75% so yeah, what Joe said.

by **JoeB** » Wed Aug 10, 2005 6:41 am

Midias wrote:Thanks I am glad to hear it is where it should be.
Would it be worth it from a performance stand point to try to make it hit 100%

Good question, I've often wondered why Toyota did that. I'm not sure if it would help because the ECU is setup for it to work that way. -JoeB

by **Nutty101** » Wed Aug 10, 2005 7:29 am

You can get to 100% but it kinda does not help much as the motor tends to bog some. In my view the 75% is 100%.

Here is some info incase you are bored and wana make it open more.

(5) Throttle signal circuit
The throttle position sensor detects the throttle valve opening angle as a control signal, which is input into TERMINAL
VTA1 of the engine control module.

Wirediag:

by **JoeB** » Wed Aug 10, 2005 1:08 pm

That's great info and thanks for the diagram. Can you help me understand it a little? My understanding is that the throttle position controls the opening of the butterfly valve to let air in. Obviously, the more air, the more potential for power when mixed with the propper amount of fuel. In addition to the butterfly valve, the electrical value of the position of the sensor is sent to the ECU to tell it how long to hold the injectors open when combined with data from other sensors and lookups in the tables in the ECU. If that's true and you have a piggy-back computer, couldn't you let more air in by adjusting it to 100% and correct the fuel by adjusting the piggy-back? -JoeB

by **Nutty101** » Wed Aug 10, 2005 9:23 pm

JoeB wrote:That's great info and thanks for the diagram. Can you help me understand it a little? My understanding is that the throttle position controls the opening of the butterfly valve to let air in. Obviously, the more air, the more potential for power when mixed with the propper amount of fuel. In addition to the butterfly valve, the electrical value of the position of the sensor is sent to the ECU to tell it how long to hold the injectors open when combined with data from other sensors and lookups in the tables in the ECU. If that's true and you have a piggy-back computer, couldn't you let more air in by adjusting it to 100% and correct the fuel by adjusting the piggy-back? -JoeB

With a piggy yeah I don't see why not. But the stock ecu just bogs the motor down. I am guessing they never really ment for the map to go to that point. Could have just been the motor we were playing with also. Hard to say, only did it once and only on one solara.

Throttle position sensor.

Throttle position sensor.

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