I Have a 2003 Subaru Baja 2.5 litre Automatic.That suddenly stopped running when I was pulling into a parking lot and is giving me a P0122 error code (Throttle position sensor circuit low input).

It will sometimes start idle high for a few minutes then start to idle rough and die.

I replaced the throttle position sensor same thing happens.

While adjusting the position sensor with the key in the ignition on position I hear a humming coming from underneath car. and when I attempt to start it will flash The AT oil temp light on dash.

Any thoughts or ideas?

Thanks, Badchicken425

I reset the ecu and got it started it idled rough then smoothed out after time but I could not accelerate otherwise it would die.

the error code and transmission light have now vanished 

Edited May 1, 201411 yr by badchicken425

TPS problems are rare, and are usually due to a bad connection or poor ground rather than a failed TPS. You need a voltmeter to adjust the TPS so the ECU gets the correct voltage signal with the throttle closed. Adjust so you have 0.50-0.55V on the center pin.

 

If that doesnt fix it you may have a poor connection in one of the three large connectors on the bell-housing. Or a poor ECU ground to the intake manifold.

 

Symptoms also rhyme with low fuel pressure. 00-04 have an issue with a cap on the fuel pump assembly. It cracks and bleeds fuel pressure back into the tank.

Get the TPS adjusted first and reset the ECU again. Then pull the pump assembly and inspect if that doesn't take care of it.

Adjusted the TPS reset ECU and it ran great for about a minute then started idling rough and died now wont start. 

Checking the fuel pump next.

Fuel pump is pulled and there does appear to be a crack.

 

AAAAAAh0/B23hl2I8Ydg/w907-h510-no/20140501_161926.jpg

Fuel pump is pulled and there does appear to be a crack.

 

AAAAAAh0/B23hl2I8Ydg/w907-h510-no/20140501_161926.jpg

Would this cause my problem?

Would this cause my problem?

Can I fix it without having to buy the whole assembly?

Then that would definitely be part of the problem, if not the whole thing.

 

There is a replacement cap out there. If you search here there is a thread with a link.

The replacement cap is a different design but fits the same and fixes the problem.

yes, you can even see the o-ring displaced.
 
you need a metric 928 (IIRC) Viton o-ring, and the cap and filter (throw the filter away) for -like maybe-an 04 or 05 Forester.

a W0133-1617990


 
http://www.partsgeek.com/gbproducts/WC/18023-01151841.html?utm_content=YN&utm_term=2004+Subaru+Outback+Fuel+Filter+NPN+W0133-1617990+04+Subaru+Fuel+Filter&fp=pp&gbm=a&utm_source=google&utm_medium=ff&utm_campaign=PartsGeek+Google+Base&gclid=CJKXitixjL4CFTIV7AodoyQAgw
 
 
or from amazon; http://www.amazon.com/NPN-W0133-1617990-NPN-Fuel-Filter/dp/B005FEYQ10/ref=sr_1_2?ie=UTF8&qid=1399004269&sr=8-2&keywords=2004+subaru+fuel+filter+W0133

 

 

 

there is a dimple/bump on the large tab, don't force it past or it may bend if it rides-up on the lug.

Edited May 9, 201411 yr by 1 Lucky Texan

Thanks for all your help    I was able to locate a fuel pump assembly for 100.00 on Ebay. I got it in the mail today and installed it in the Baja and the little Scooby Truck is up and running again.   .