New TPS
Instructor
Joined: Jul 2004
Posts: 210
Likes: 0
From: Lakewood CO
Originally Posted by JustForFun
Can Reset It Using A Volt Meter
If you have an LTx like me then you probably can't use this advice since TPS is not adjustable. I would like to know if there is anyway to do the relearn on an LTx car without going to the dealer as well.
Dave
Melting Slicks
Joined: Oct 2004
Posts: 2,510
Likes: 4
From: Austin Texas
Originally Posted by KDuniverse
Anyone know how to "relearn" without the Tech 1? Is it at all possible, or do I need to bring it to a shop?
Not much to it, the TPS sensor is a simple mechanical varistor....now some folks will adjust their TPS setting by enlarging the 2 mounting holes in the TPS unit, so that it can move in a 'circular' fashion on the throttle shaft, whereby the TPS idle voltage cab be modified. While others will just purchase an adjustable TPS sensor.
FYI, There is no power gain by raising your idle setting voltage. What does change is when the PCM will switch from MAF/MAP/O2 to "enrichment mode". Not sure I am explaining this intelegably, so look at this pic, where 2 idle setting voltages are displayed...heavy footed acceleration, you couldn't tell the difference, moderate acceleration, and the lower TPS graph will kick into fuel hog mode sooner...but who cares about moderate acceleration anywho?????
Last edited by MikeC4; Jul 5, 2006 at 07:58 PM.
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Originally Posted by KDuniverse
Anyone know how to "relearn" without the Tech 1? Is it at all possible, or do I need to bring it to a shop?
RACE ON!!!
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
2027 Corvette vs The World: Every C8 vs Its Closest Competitor
Joe Kucinski
10 Most Common Corvette Problems of the Last 20 Years!
Joe Kucinski
Thread Starter
Le Mans Master
Joined: Nov 2000
Posts: 5,689
Likes: 0
From: Cape Coral, FL 33904
93,
I put the TPS on, and no lights came on. It idled great, and ran it for 20min or so. I checked the codes, and it still shows H64. How do I clear out that old code? If it was new, there woudln't be an H, would there be?
I put the TPS on, and no lights came on. It idled great, and ran it for 20min or so. I checked the codes, and it still shows H64. How do I clear out that old code? If it was new, there woudln't be an H, would there be?
Last edited by KDuniverse; Jul 5, 2006 at 09:32 PM.
Melting Slicks
Joined: Oct 2004
Posts: 2,510
Likes: 4
From: Austin Texas
Originally Posted by KDuniverse
disconnected for 10min, nothing.
Last edited by MikeC4; Jul 5, 2006 at 09:49 PM.
Drifting
Joined: Sep 2003
Posts: 1,483
Likes: 4
From: middle TN
The way I read my '94 FSM, it's the ECM that has to learn the specific voltage of a newly installed TPS. Precise throttle position is required for proper operation of ASR (traction control).
So my question is the same as the original poster's (how's it done without the Tech 1), and also...is it one of those steps you could just skip with no ill effects in real world use?
btw...94 TPS is non-adjustable
So my question is the same as the original poster's (how's it done without the Tech 1), and also...is it one of those steps you could just skip with no ill effects in real world use?
btw...94 TPS is non-adjustable
Melting Slicks
Joined: Oct 2004
Posts: 2,510
Likes: 4
From: Austin Texas
it is a simple sensor to test if you have a digital voltmeter. It's best if you have a TPS "test harness" to check voltages(otherwise you have to make small piercing holes through the wire insulation to measure stuff). I can't remember the procedure, but can look it up if you want...I have the test harness and instructions out in the garage somewhere.....
http://www.ecklers.com/product.asp?p...&dept%5Fid=119
http://www.ecklers.com/product.asp?p...&dept%5Fid=119
Melting Slicks
Joined: Oct 2004
Posts: 2,510
Likes: 4
From: Austin Texas
Originally Posted by Scooter 94
The way I read my '94 FSM, it's the ECM that has to learn the specific voltage of a newly installed TPS. Precise throttle position is required for proper operation of ASR (traction control).
So my question is the same as the original poster's (how's it done without the Tech 1), and also...is it one of those steps you could just skip with no ill effects in real world use?
btw...94 TPS is non-adjustable
So my question is the same as the original poster's (how's it done without the Tech 1), and also...is it one of those steps you could just skip with no ill effects in real world use?
btw...94 TPS is non-adjustable
Drifting
Joined: Sep 2003
Posts: 1,483
Likes: 4
From: middle TN
From '94 FSM Book 2:
The Electronic Brake and Traction Control Module (EBTCM) must learn the TP sensor idle position voltage with new component(s) installed. This is necessary to ensure effective engine torque reduction during ASR events. The procedure requires a Tech 1 scan tool or CAMS unit and will be described using a Tech 1.
A. Ignition off.
B. Connect Tech 1
C. Ignition on
D. Follow menus to reach ABS/ASR features
E. Slect "F5:TPSENSR LRN"
F Press (up arrow) to begin learn procedure
G. Wait for Tech 1 to indicate complete
H. Ignition off.
I. Disconnect Tech 1
To me, it reads like the EBTCM has to learn something specific about that particular new TPS. There's no adjustment of the TPS and the TPS doesn't "do" anything other than send its signal to the EBTCM.
The Electronic Brake and Traction Control Module (EBTCM) must learn the TP sensor idle position voltage with new component(s) installed. This is necessary to ensure effective engine torque reduction during ASR events. The procedure requires a Tech 1 scan tool or CAMS unit and will be described using a Tech 1.
A. Ignition off.
B. Connect Tech 1
C. Ignition on
D. Follow menus to reach ABS/ASR features
E. Slect "F5:TPSENSR LRN"
F Press (up arrow) to begin learn procedure
G. Wait for Tech 1 to indicate complete
H. Ignition off.
I. Disconnect Tech 1
To me, it reads like the EBTCM has to learn something specific about that particular new TPS. There's no adjustment of the TPS and the TPS doesn't "do" anything other than send its signal to the EBTCM.
Melting Slicks
Joined: Oct 2004
Posts: 2,510
Likes: 4
From: Austin Texas
Scooter 94- Thank you for the clarification, because I was starting to get confused with this thread. The EBTCM was not mentioned, and usually is overlooked. I suspect that the EBTCM lacks circuitry(comparators) to determine/store the TPS idle voltage. I was referring to the PCM and its ability to learn the TPS idle voltage. 
Thread Starter
Le Mans Master
Joined: Nov 2000
Posts: 5,689
Likes: 0
From: Cape Coral, FL 33904
Ok, so there is a learn process for the EBTCM? So I do need the Tech 1.
Also, about the history code. If it was still throwing the code, the light would come on, and it would run like it did. The pins aren't bent.
Also, about the history code. If it was still throwing the code, the light would come on, and it would run like it did. The pins aren't bent.