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Speedo and transmisson

  #1  
Old 09-01-2007, 04:45 PM
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Join Date: Apr 2007
Posts: 7
Default Speedo and transmisson

Hi all,

I have a few issues which I think may be connected.
Firstly when the car is hot, stuck in traffic and on the highway etc, my speedo jumps up and down regardless of my speed, also happens when stationary in traffic when I first stop.
Secondly my transmission seems to change gears at the wrong time, not a major problem just creates a slight bumpy ride between first and second and possibly third gears.

My first thought is the speed sensor needs replacing, but could be something more expensive, may be the Electronic Throttle Module???

Timming belt was replaced and transmission was flushed recently, but has not affected this particular problem.

Thanks
2001 Volvo S40 1.9T
150,000 Km
Auto Transmission
 
  #2  
Old 09-02-2007, 05:58 AM
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JPN
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Join Date: Sep 2006
Location: IPS, MA
Posts: 5,387
Default RE: Speedo and transmission

Welcome to the forum.

Sorry about the problem.

Is any of the dash warnings turned on? If not, are there auto parts shops in Canada that provide free OBD-II diagnostic service? In the States, AutoZone and other shops do this for free.

The ABS module is also related to the vehicle speed measuring, system and there are speed sensors on the engine, transmission, etc... I am not privy to S40, so you may have to wait until S40 forum members reply, and if not, wait till a gentleman by the name of Moderator Tech replies to you. Moderator Tech is the top-dog of the forum.

Sorry I couldn't help you any better.


JPN




 
  #3  
Old 09-02-2007, 02:21 PM
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Join Date: Apr 2007
Posts: 7
Default RE: Speedo and transmisson

No I have no error codes or dash lights on, I own a OBD-II scanner so i can check on a regular basis.

I had my ABS checked out not that long ago (may be 6 months) and there were no errors then. Thats not to say its error free now.

Thanks

 
  #4  
Old 09-02-2007, 02:28 PM
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JPN
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Join Date: Sep 2006
Location: IPS, MA
Posts: 5,387
Default RE: Speedo and transmission

Hi nordx,

With your reply, I can only assume the throttle body needs cleaning, throttle control motor is having problem (if the S40 is equipped with DBW).

As to harsh shifting, did you check the condition & proper level for the transmission? I am not sure what fluid is used on S40 (850 uses Dexron-III/Mercon), but I assume you've done this check already, as youseem quite knowledgeable.

Please wait till other S40 members or Moderator Tech replies, since my knowledge on the S40 is very limited.

I wish you the best of luck,


JPN
 
  #5  
Old 09-08-2007, 06:14 PM
Thread Starter
Join Date: Apr 2007
Posts: 7
Default RE: Speedo and transmission

I was thinking about cleaning the throttle body anyway, but seeing as you mentioned it, I got my finger out and actually did it. See pictures attached, mmm SHINNY!!!
In case you are wondering it was NOT shinny when I started.
Any idea how often this should be done??

I think in my preliminary drive around it has helped with the gear shifting a little and all round seems more responsive.


[IMG]local://upfiles/9572/CA34AAB73908474788CF19258193447E.jpg[/IMG]

[IMG]local://upfiles/9572/A47205F2375D4A9DBE200E7DE7055891.jpg[/IMG]
 
  #6  
Old 09-09-2007, 08:40 AM
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Location: Orlando, Florida
Posts: 36,351
Default RE: Speedo and transmission

The harsh shifting might also be fixed by software.
But if there is a sensor on the transmission that is messing up that will affect the speedo as well.
 
  #7  
Old 09-17-2007, 09:10 PM
Thread Starter
Join Date: Apr 2007
Posts: 7
Default RE: Speedo and transmisson

Finally I got an error code, well actually two:
P0700 - Transmission Control Malfunction
P0722 - Second Transmission Speed Sensor Malfunction

I left my car parked for four days while away, came back, and guess what it would even shift into reverse let alone 1st until it had warmed up.

I'll see what the dealer has to say.
 
  #8  
Old 09-18-2007, 10:20 PM
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Join Date: Mar 2006
Posts: 108
Default RE: Speedo and transmisson

keep us imformed. Sounds like Tranny is done!
 
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