Acura TSX Forum banner

Fluctuating speedometer with no check engine light

351 Views 2 Replies 2 Participants Last post by  Redcl9enjoyer
Don't get mad at me if it has been buried but I've been searching around the threads and cant find my issue. So recently I had my "check emissions system" light come on due to a loose pcv hose, when this happened I also noticed that my speedometer wasn't functioning properly. I fixed the issue with the hose and the light went away but now I'm left with my speedometer still fluctuating, when I drive my car and shift gears it drops 2-5mph and bogs sometimes, also when I let go of the accelerator it will fluctuate from about 40mph to 20mph then 0mph. I've been trying to research this problem and seems to be the speed sensor from the little information that I could find. I'm not too knowledgeable mechanically but know enough to replace and fix issues that I've come across before. I cant find a video or thread on the speed sensor that would cause this issue, not too sure if its the abs speed sensors but read that it would be on the transmission. How would I know which sensor to do voltage/resistance checks on? I don't know the speed sensor locations and need some help if anyone is able to offer any advice.
1 - 3 of 3 Posts
There was another recent similar thread recently but it was the member's dash cluster tach wasn't working.

I suggested to connect an OBDII scanner to display the engine rpm's which would narrow down the issue.
An OBDII scanner can definitely display engine rpm's, we have a OBDII Scangauge in our TSX which displays voltage, air intake temps, engine temp and engine rpm's.

So will an OBDII gauge display road speed on a 2006 manual trans TSX? A google search, says yes it will.

That would narrow the problem down and possibly point to a dash cluster failure.

I think the road speed sensor is on the transmission.. I think it's item 10 in this diagram:

See less See more
  • Like
Reactions: 1
Thanks for the diagram it really helped, I get the part later today and am gonna swap it out. Code I pulled said it was the output speed sensor as well even though I didn't have a cel.
1 - 3 of 3 Posts