Testing Throttle position sensor

syncroparge · Posted: Sat Oct 03, 2009 2:03 pm Post subject: Testing Throttle position sensor

I been trying to sort my high emissions problem out for a while now 92/93 2.2 legacy. When testing TPS what readings should I get Haynes manuel says approx .5v -1v closed throttle 4.5v-5v wide open. I have checked on other web sites and they say .5v-1v wide open 4.5v-5v closed. Mine reads the latter what readings should I be getting. Have I got the right TPS Part NoA22-000R25 4 pin plug is fitted i've tried two of these with the same results.I know TPS has been touched as the screws are damaged. Do turbo engined cars use different TPS with different voltage values. Have I got the right ecu part No 22611AA670 Type D7. The engine runs great it just has high emissions at tickover.
Any help Please Thanks in advance...Brian

rjes · Posted: Sat Oct 03, 2009 5:18 pm Post subject:

Hello Brian,
As far as I know approx 0.5 - 4.5V is right for all the engines as far as I know. I can't remember whether 0.5 is with the throttle open or closed without looking it up, but I'm sure it would not run anywhere near right if it were some how wireds the wring way around. There is no reason to touch those wires at all on any of the harnesses when modifying for use in a VW, so it's very very unlikely they are the wrong way around.

Is your engine stick in cold start mode? If so, that's a likely reason for it being rich at idle. If so it will always idle at around 800 rpm, and never drop to 600 as it should once it's warm, and I imagine the likely cause would be the temperature sender.
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Richard,

R J Engineered Solutions
Quality Subaru Powered VW Components
www.rjes.com

syncroparge · Posted: Sat Oct 03, 2009 5:37 pm Post subject:

Richard temp sender has been tested in a pan of water on the stove and is within specs in the haynes manual, according to the haynes both of the tps's I have read the wrong way round but I think I would be very unlucky to have two tps's that are bad thats why I was asking for part Nos as I suspect I might have the wrong part if they have different parts for different years/ models. I am not suspecting a harness fault as I have continuety checked all wires to sensors and everything is ok. Thanks...Brian

rjes · Posted: Sun Oct 04, 2009 4:17 pm Post subject:

I'd say it's more likely that the Haynes manual is wrong than there being two physically interchangeable sensors which have the 0V and 5V terminals in the opposite positions. Generic manuals like Haynes and Chilterns are of linmited use because tey try to cobver too many modelas, and are both based on US spec models.

It depends what model / age engine you have. This is copied from two Subaru manuals:

3 wire throttle position sensor:

Connector & terminal / Specified voltage
(B136) No. 15 — (B136) No. 17 / 0.45 —
0.55 V [Fully closed.]

4 wire throttle position sensor:
as above except 4.5 - 5.5V fully closed
_________________
Regards,

Richard,

R J Engineered Solutions
Quality Subaru Powered VW Components
www.rjes.com