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Guest Message by DevFuse

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How To Adjust TPS???

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6 replies to this topic

#1 pearlm30


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Posted 28 March 2009 - 10:36 PM

How do I adjust/check the throttle position sensor on MY 98 forester?

#2 Legacy777



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Posted 30 March 2009 - 11:45 AM

They do not need to be adjusted. The ECU takes a reading at every startup and calibrates that as the throttle closed position.

#3 davebugs


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Posted 30 March 2009 - 12:26 PM

Great to know. I recently swapped a throttle body because I had stolen the TPS from the intake that I needed to use and didn't know how to reset the TPS if I just replaced it.

#4 OB99W


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Posted 30 March 2009 - 02:31 PM

[...]didn't know how to reset the TPS if I just replaced it.

Need for precise adjustment depends on the whether the TPS incorporates an idle switch or not. The older ones with 4 terminals have the switch, whose contacts should be closed when the throttle is closed, and open when the throttle is barely opened. The newer 3-terminal ones don't include the switch, are more tolerant of the adjustment, but still should output signal voltage within a certain range of operation. See http://endwrench.com...s/pdfs/Fuel.pdf for some basic info.

#5 pearlm30


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Posted 30 March 2009 - 05:04 PM

I dig up the manual and found out that it can be adjusted thru 2 ways.
1)At the ECU side
2)Using the select monitor

Different from 92 SVX which you can probe the Volt meter into the TPS connector to see if you are at about .48 or .50V

#6 Legacy777



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Posted 02 April 2009 - 07:56 PM

If you have the four wire TPS with the incorporated idle switch, they need to be adjusted using the following procedure. Other than that, there is no other adjustments that need to be made.


#7 sa997


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Posted 24 May 2011 - 02:44 PM

Hey. About the clock rpm. No more than 1000 rpm. Could be a few days a week, the clock works fine. The rest was invalid .. First of all (this is manual Impreza 1994. injection.)
1. The problem began when my mechanic did treatment 10000. And where did wash engine with degreaser and water.
2. I noticed when I turn on Swatch. Engine is turned off. The merger is above 0. About 4 Malimter. I know I turn on the vehicle. Time columns do not exceed 1000. I noticed that the most important detail. I travel in this state. I hear rings of ignition.
3. If lighting Suwetes. (engine off) hand column is 0. I turn the engine. Tory clock works fine. Everything is fine. Even with the air conditioner is turned on
Why am I complaining? I travel with an air conditioner. Clock rpm. Does not exceed 1000. I stopped at a traffic light. The engine stutters
And rings off. turns on a lamp to me. Check engine. Do you have an idea? . With thanks to Shlomi
(through the back. I replaced ignitor and it did not help)thanks

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