Results 1 to 7 of 7
Thread: TPS Values - not what I expected
-
10-09-2011 #1
Registered User
- Join Date
- Feb 2002
- Location
- Santee, CA
- Posts
- 387
TPS Values - not what I expected
I hooked my laptop up to my F.A.S.T. ECU tonight (old one, not XFI) to see if it was communicating. I noticed that the TPS value is at 79% when the pedal isn't depressed and drops to ~40% when the pedal is dropped to the floor. Shouldn't the TPS % value increase not decrease? Anyone see a problem with only a 40% swing?
-
10-09-2011 #2
Registered User
- Join Date
- Jan 2005
- Location
- Enfield, CT
- Posts
- 423
Not sure what your setup is, but I know in some fly-by-wire applications if the TPS signal is taken from the pedal sensor the values are reversed. As a matter of fact my Compushift controller has a setting to take this into account. Also, on said pedal sensor there are two sensor signals (wires), and one has a significantly narrower range than the other.
'67 GTO - LS3, 4L60E, SC&C AFX Package, KORE3 C6 Z06, Boyds PT-09s
https://www.pro-touring.com/showthre...7-GTO-LS3-Swap
10-10-2011 #3
Registered User
- Join Date
- Jul 2006
- Location
- Indianapolis, IN
- Posts
- 350
I would be curious to see what you TPS calibration looks like. If you can do a screen shot of the TPS cal it might be helpful.
Mike Norris
10-10-2011 #4
Registered User
- Join Date
- Aug 2004
- Location
- Rustburg, Virginia
- Posts
- 3,436
Maybe check the voltage values instead and see what the computer is seeing.
1970 RS/SS350 139K on the clock:
89 TPI motor w/ 1pc rear seal coupled to a Viper T56 via Mcleod's modular bellhousing w/ hydraulic T/O bearing from the Viper, 12 bolt rear w/ 3.73 gearing, SC&C upper control arms, factory lowers with Delalums, C5 brakes at all four corners, Front Wheels 17x8's with Sumi 255/40/17 and Rear Wheels 17x9's with Sumi 275/40/17.
Brief description of the work done so far can be found here: http://www.nastyz28.com/forum/showthread.php?t=112454
10-11-2011 #5
Registered User
- Join Date
- Jan 2006
- Location
- Miami, FL
- Posts
- 166
At best power and ground are reversed. Or all three are pinned wrong. The FAST Classic cannot calibrate TPS. Typical readings are ~5-8% at idle and above 95% at WOT.
Rob
10-12-2011 #6
Registered User
- Join Date
- Aug 2001
- Location
- Wilton, CA. (Sacramento)
- Posts
- 2,995
yep, been there, seen that before.
Originally Posted by MrForce
10-12-2011 #7
Registered User
- Join Date
- Feb 2002
- Location
- Santee, CA
- Posts
- 387
OK...took the sensor off and started checking the wires. I didn't know the pinout of the 06681 TPS so tried a few different configurations. Rob was correct...Found out that all 3 connections were wrong and the FAST manual is incorrect (possibly meant for a different sensor). I'm now getting 2% at idle and ~70% at WOT. Thinking I'm going to need to move the throttle cable connection closer to the throttle pivot to get closer to that 95% mark, but at least I'm getting the correct response now.
Reply With Quote
