TPS Voltage Check
Thread Starter
Instructor
Joined: Jan 2019
Posts: 167
Likes: 33
From: Connecticut, USA
TPS Voltage Check
One of the things I did while reviving my C4 that has been sleeping for 22 years is replace the TPS.
Reads .54 volts with the throttle closed, but only goes to 3.3 volts with throttle wide open. Progresses smoothly while opening throttle. Shouldn't the wide open voltage be higher Can't find reference to tolerance on the high end. Just a range of .5 to 5 volts in the service manual. Whata u think?
Reads .54 volts with the throttle closed, but only goes to 3.3 volts with throttle wide open. Progresses smoothly while opening throttle. Shouldn't the wide open voltage be higher Can't find reference to tolerance on the high end. Just a range of .5 to 5 volts in the service manual. Whata u think?
Drifting
Joined: Sep 2022
Posts: 1,456
Likes: 380
From: Liberty, SC
2023 C4 of the Year Finalist - Unmodified
Take the TPS off the mount entirely and see if you can move it to the WOT voltage. If you can then its an adjustment thing, if not id say replace it. On mine, both bolts holes allow a bit of adjustment. I had to slide the TPS to where it was better inline w the arc of the tab that was moving it.
Le Mans Master
Joined: Feb 1999
Posts: 9,922
Likes: 38
From: South Carolina
St. Jude Donor '03 & '05
I have seen many C4s where throttle cable is not opening the throttle all the way.. Like someone said above, check to make sure from the throttle pedal, the blades open all the way.
Thread Starter
Instructor
Joined: Jan 2019
Posts: 167
Likes: 33
From: Connecticut, USA
Take the TPS off the mount entirely and see if you can move it to the WOT voltage. If you can then its an adjustment thing, if not id say replace it. On mine, both bolts holes allow a bit of adjustment. I had to slide the TPS to where it was better inline w the arc of the tab that was moving it.
Thread Starter
Instructor
Joined: Jan 2019
Posts: 167
Likes: 33
From: Connecticut, USA
I'm using a test harness I picked up somewhere to test the voltage and opening the throttle by hand.
Thread Starter
Instructor
Joined: Jan 2019
Posts: 167
Likes: 33
From: Connecticut, USA
[QUOTE=Also check the 5V reference wire to see if the ECM is actually sending 5V to it, or whether the TPS is actually receiving the full 5V.[/QUOTE]
Will take a look at that tomorrow.
It might just be a bad TPS.
Will take a look at that tomorrow.
It might just be a bad TPS.
