TPS Voltage
03-20-2009, 08:33 AM
#1
3rd Gear Member
Thread Starter
Join Date: May 2004
Location: Richmond, VA
Posts: 614
TPS Voltage
Hi everyone,
I've been a member of this site for awhile, but I haven't posted in quite some time. I have a quick (hopefully) question about my '94 5.0.
The RPM's hang a little bit between gears. My buddy and I noticed this the other day so we got a volt meter to read the TPS and at idle it is reading almost 5 volts. As I understand it, it should read 4.5-5 volts at WOT and at idle it should right around .98-.99.
Is there a way to adjust the TPS voltage on the '94, or do I need to replace the TPS sensor altogether?
-Chris
I've been a member of this site for awhile, but I haven't posted in quite some time. I have a quick (hopefully) question about my '94 5.0.
The RPM's hang a little bit between gears. My buddy and I noticed this the other day so we got a volt meter to read the TPS and at idle it is reading almost 5 volts. As I understand it, it should read 4.5-5 volts at WOT and at idle it should right around .98-.99.
Is there a way to adjust the TPS voltage on the '94, or do I need to replace the TPS sensor altogether?
-Chris
03-20-2009, 10:07 AM
#3
5th Gear Member
Join Date: Jan 2006
Location: Puerto Rico
Posts: 3,926
CEL indicator on? ..... Suggest to run a DIY KOEO/KOER self test and LUK the results. BTW.... "RPM's hanging" between shifts is normal, the system will keep RPM's above idle speed once the VSS input is > 6 MPH, called the dashpot function.
03-20-2009, 01:29 PM
#4
3rd Gear Member
Join Date: Feb 2008
Location: Florida
Posts: 836
To add to what Joel stated, If you are reading 5v at the TPS this tells me you are probably probing the wrong wires. You need to probe green and black.
The hanging idle (if out of normal range) may be due to a malfuctioning/sticking IAC. But just as Joel said, start with KOEO/KOER there could be something else causing this.
The hanging idle (if out of normal range) may be due to a malfuctioning/sticking IAC. But just as Joel said, start with KOEO/KOER there could be something else causing this.
03-23-2009, 09:48 AM
#7
3rd Gear Member
Thread Starter
Join Date: May 2004
Location: Richmond, VA
Posts: 614
haha, I could've probed the wrong wire had I been the one actually doing it... but my buddy (who has more car knowledge than me) did it. Maybe he was having one of those days and make a small mistake. Happens to the best of us. I might retry probing it.
03-23-2009, 05:03 PM
#9
3rd Gear Member
Thread Starter
Join Date: May 2004
Location: Richmond, VA
Posts: 614
Ok, so this is an embarrassing question to ask but I'm quite a newbie when it comes to the TPS (or anything else electronic on the car)... but which setting on the meter do I use when probing the two wires? It doesn't specify in the stickies - at least the stickies I found.
03-23-2009, 05:23 PM
#10
3rd Gear Member
Thread Starter
Join Date: May 2004
Location: Richmond, VA
Posts: 614
N/m... I figured it out 
We definitely were probing the wrong wires the first time. This time I'm getting .92v. Should I adjust this so that it's .98v or is it okay where it's at? What would it mean for the voltage to be "low" or "under" .98?
We definitely were probing the wrong wires the first time. This time I'm getting .92v. Should I adjust this so that it's .98v or is it okay where it's at? What would it mean for the voltage to be "low" or "under" .98?