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Request: throttle position sensor measurements
Posted: Sat Mar 10, 2012 3:34 am
by 91Beater
Ok, according to here:
http://www.surrealmirage.com/subaru/engine.html
2-3 should be 12kohm
2-4 3-5k WOT, 10-12k no throttle
1-2 shorted on idle
Could you check the value for 2-3, and 2-4 at WOT and no throttle?
Also, how far do you have to move the gas before 1-2 goes from short to open?
My TPS is mouted with two screws and the TPS itself has two oval holes and it can move about once the screws are loosened. Does yours have some means of attachment that prevents movement?
If it does move, how do I calibrate the proper position? Do I move the sensor around until I reach the specific ohm value at WOT, or do I do this at no throttle?
Re: Request: throttle position sensor measurements
Posted: Sat Mar 10, 2012 4:04 am
by 91Beater
The position vs resistance relationship between that site and the FSM scan are opposite.
http://www.main.experiencetherave.com/s ... sting1.jpg
Which is right? The FSM's 1 to 4.3 doesn't seem right.
Re: Request: throttle position sensor measurements
Posted: Sat Mar 10, 2012 5:08 am
by vrg3
The factory service manual scans are correct. If the Chilton's manual disagrees, disregard it and follow the FSM.
This scan should answer your question about adjustment and idle threshold:
http://www.main.experiencetherave.com/s ... sting3.jpg
Re: Request: throttle position sensor measurements
Posted: Mon Mar 12, 2012 6:19 pm
by Legacy777
Yeah I would think the FSM should be correct. I believe the readings on my site may be from the Chiltons. I'd have to put a multimeter on the TPS to confirm though.
Re: Request: throttle position sensor measurements
Posted: Wed Mar 14, 2012 6:18 am
by 91Beater
Legacy777 wrote:Yeah I would think the FSM should be correct. I believe the readings on my site may be from the Chiltons. I'd have to put a multimeter on the TPS to confirm though.
The FSM is wrong in that part. Chilton's is correct.
2-4 resistance gets smaller with throttle opening, not larger.
Re: Request: throttle position sensor measurements
Posted: Wed Mar 14, 2012 3:11 pm
by silver03
I never could get this figured out...ending up going to upull and grabbing a complete throttle body with sensor...which worked!
Re: Request: throttle position sensor measurements
Posted: Thu Mar 22, 2012 5:37 pm
by Legacy777
91Beater wrote:Legacy777 wrote:Yeah I would think the FSM should be correct. I believe the readings on my site may be from the Chiltons. I'd have to put a multimeter on the TPS to confirm though.
The FSM is wrong in that part. Chilton's is correct.
2-4 resistance gets smaller with throttle opening, not larger.
Ok, thanks for verifying.
Re: Request: throttle position sensor measurements
Posted: Thu Mar 22, 2012 5:38 pm
by Legacy777
silver03 wrote:I never could get this figured out...ending up going to upull and grabbing a complete throttle body with sensor...which worked!
Well, glad the new TB worked though.