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Adjusting the TPS
Could someone explain kind of the...method of adjusting the TPS? I read the how-to many times and I don't understand what exactly you move. Do you move the entire sensor? Is it the swinging of the sensor itself that does the adjustment? I'm confused on this matter.
Thanks in advance.
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-Jason (8/23/07-Present) 1995 Subaru SVX LSi (197k) Polo Green (#1102) 03/95 Mods: DDM Tuning 4500k 35w Low Beam HID, 100w H3 Bulbs, Extra Ground Cables, 15 minute $12.96 mod, svxfiles designed transmission mount (), sporting a "new" tail light bar, silver BBS rims, custom power steering cooler (one that doesn't dump ATF constantly), new negative lead cable, no more third or fourth gear (1977-Present) 1977 Chevrolet Corvette (81k) Silver (12/01/2011-Present) 2005 Subaru Outback 2.5i Limited 5MT (97k) I have a bad feeling about this. -Obi Wan Kenobi |
#2
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Unplug it, stick a sewing needle or something into where the white wire goes into the plug, plug it back it. Turn the ignition to "on," take a multimeter and touch the + lead to that needle and the - lead to the chassis. Swivel the tps around until it reads 5.1 - 5.2 volts. (should read 5.0 but with the slight increase your idle won't be so low)
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Brian |
#3
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Meantime the existing data would appear OK, as instructions regarding loosening and tightening the fixing screws, should provide an adequate clue.
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Trevor, New Zealand. As a child, on cold mornings I gladly stood in cowpats to warm my bare feet, but I detest bull$hit! |
#4
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-Jason (8/23/07-Present) 1995 Subaru SVX LSi (197k) Polo Green (#1102) 03/95 Mods: DDM Tuning 4500k 35w Low Beam HID, 100w H3 Bulbs, Extra Ground Cables, 15 minute $12.96 mod, svxfiles designed transmission mount (), sporting a "new" tail light bar, silver BBS rims, custom power steering cooler (one that doesn't dump ATF constantly), new negative lead cable, no more third or fourth gear (1977-Present) 1977 Chevrolet Corvette (81k) Silver (12/01/2011-Present) 2005 Subaru Outback 2.5i Limited 5MT (97k) I have a bad feeling about this. -Obi Wan Kenobi |
#5
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you are rotating the whole sensor, just loosen the two screws holding it to the throttle body and it will rotate somewhat smoothley by hand. you want to stick a pin or needle through the middle wire of the tps then hook your meter up to it and a ground source. for connecting the meter I reccomend the wire with alligator clips on both ends as they leave your hands free to hold the meter while rotating the tps.
hope this helps let me know if i need to clarify parts of it
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1991 xt6 eg33? 1993 gc track car |
#6
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My instructions, as is included in the how too:-
"ADJUSTING AND CLEANING THE THROTTLE POSITION SENSOR. In order to adjust the TPS, the manual says to measure voltage at the TPS by inserting meter probes into the plug at the ECU. Nice and easy that is! In order to accomplish the feat without tying yourself in a knot you will require, best of all, one of those dress making pins with a nice thin shank and a knob on the end, or a thin needle. Also a meter to measure 0.5 volts D.C.. The TPS comprises a potentiometer, presumably used in a voltage divider configuration, as three wires come from it. There is a plug and socket close to the unit so that it can be easily removed for servicing. At this plug, the wires are --- black ground and one end of the resistance element, red the other end and white the wiping contact. Stick your pin right through the white insulated wire so that you can clip your meter lead onto it to make measurements. A fine pin will not damage the conductors as they will spread and there will be no significant damage to the insulation. Measure between the wiper, i.e. white wire and ground, by connecting to engine, chassis, battery negative, or whatever. Now from the book: (i.e. Taken exactly ftom the Subaru Manjuals.) 1. Connect all connectors. 2. Loosen TPS fixing screws. 3. Turn ignition on. 4. Adjust TPS position while throttle valve is FULLY closed, using a volt meter, to the specified voltage. 5. Tighten fixing screws. The voltage is specified within a tolerance from 0.45 to 0.55 volts. You should have no trouble in setting things at exactly half a volt. (0.50) Before removing the TPS or altering the original setting, it is a good idea to mark the mating castings with a scratch so that one can check on the adjustment, before and after, as a matter of interest. It is always nice to know if the effort expended has in fact improved things." Surely when read completely through, the procedure is easily fully understood. However text as per the manuals (4), could be altered as follows, if someone able to do so has the inclination. 4. With throttle valve is FULLY closed, using a volt meter, adjust the position of the TPS by rotating the complete assembly in relation to the mounting, until the specified voltage is registered. Note that slotted holes are provided in the assembly to allow for this adjustment.
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Trevor, New Zealand. As a child, on cold mornings I gladly stood in cowpats to warm my bare feet, but I detest bull$hit! |
#7
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Dave - 03 Baja - 92 SVX - 86 Brat - 08 OB 3.0 |
#8
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I'm sure we can get it altered though, or replace it with a new version. Joe
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Black Betty [Bam a Lam!] '93 UK spec, still languishing Betty Jersey Girl Silver '92 UK [Channel Isles] 40K Jersey Girl @ Mersea Candy Purple Honda Blackbird Plum Dangerous White X2 RVR Mitsubishi 1800GDI. Vantastic 40,000 miles Jersey Girl |
#9
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Just a note guys.
I've always adjusted the TPS to 0.50 untill Mike/LAN told me that we get a smoother idle at 0.48. And the higher # value that you adjust it to has a tendency to more fully engage the AWD where applicable. That means if you set it too high you could have more AWD engagement at lower speeds than you should. Another thing, when using the SSM and adjusting the TPS, USUALLY, (as in almost always) when you set the TPS to a value, like to 0.48 in the engine mode, when you check it in the transmission mode it reads 0.02 higher! So when set at 0.48 in the engine mode, and checked in transmission mode it then reads 0.50!
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www.svxfiles.com The first SuperCharged SVX, the first 4.44 gears, the first equal length headers, the first phenolic spacers, the first Class Glass fiberglass hood, the first with 4, 4.44s in his driveway Fiberglass Hood thread My locker 4.44 Swap link |
#10
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That's pretty interesting information Tom, thanks.
Joe
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Black Betty [Bam a Lam!] '93 UK spec, still languishing Betty Jersey Girl Silver '92 UK [Channel Isles] 40K Jersey Girl @ Mersea Candy Purple Honda Blackbird Plum Dangerous White X2 RVR Mitsubishi 1800GDI. Vantastic 40,000 miles Jersey Girl |
#11
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Trevor, I don't doubt your ability to write the instructions, however I being...well..stupid sometimes didn't understand exactly what to adjust. I still think that a picture with an arrow will clarify (for other people like me who just don't get it). I think it's my inclination that to adjust things, I usually need to take them apart. This adjustment requires virtually no disassembly.
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-Jason (8/23/07-Present) 1995 Subaru SVX LSi (197k) Polo Green (#1102) 03/95 Mods: DDM Tuning 4500k 35w Low Beam HID, 100w H3 Bulbs, Extra Ground Cables, 15 minute $12.96 mod, svxfiles designed transmission mount (), sporting a "new" tail light bar, silver BBS rims, custom power steering cooler (one that doesn't dump ATF constantly), new negative lead cable, no more third or fourth gear (1977-Present) 1977 Chevrolet Corvette (81k) Silver (12/01/2011-Present) 2005 Subaru Outback 2.5i Limited 5MT (97k) I have a bad feeling about this. -Obi Wan Kenobi |
#12
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Trevor, New Zealand. As a child, on cold mornings I gladly stood in cowpats to warm my bare feet, but I detest bull$hit! |
#13
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Hi Trevor.
When you hook up a Subaru Select Moniter you have four modes to check out your SVX. The first that pops up is EGI, to check the engine parameters then AT for information on the automatic transmission, AC for checking out the air conditioning stuff, and CC for the cruise control. On the engine mode you can check the vehicle speed in both MPH or KPH. But in the trans mode you can check either speed sensor #1, or #2, in both MPH and KPH. In EGI and AT you can check engine temp, in both farenheit and celsius, and THOSE readings show the same... More later.
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www.svxfiles.com The first SuperCharged SVX, the first 4.44 gears, the first equal length headers, the first phenolic spacers, the first Class Glass fiberglass hood, the first with 4, 4.44s in his driveway Fiberglass Hood thread My locker 4.44 Swap link |
#14
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-Craig 94 LSi 5spd Barcelona Red, 14Xk miles. Full custom exhaust (Stebro cat-back, custom rest of the way forward) 8000K HID kit from Tom (SVXfiles), Energy Suspension front sway bar bushings, Non-Droopy visors, Race Concepts C/D + Dimpled Rotors, Axxis Ultimate pads,SS brake lines, Bontrager Works #009 (or something like that), stripped interior. (up next) Full cage, fuel cell, 327 swap |
#15
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He's rubbing it in Craig, just 'cos the rest of us don't have one!!
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Black Betty [Bam a Lam!] '93 UK spec, still languishing Betty Jersey Girl Silver '92 UK [Channel Isles] 40K Jersey Girl @ Mersea Candy Purple Honda Blackbird Plum Dangerous White X2 RVR Mitsubishi 1800GDI. Vantastic 40,000 miles Jersey Girl |
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