Go Back   Corvette Forum > C5 Corvettes, 1997 - 2004 > C5 Tech
Sign in using an external account
Register Forgot Password?
Register Search Today's Posts Mark Forums Read FAQ Vendor Directory
Search
C5 Tech
Corvette Tech/Performance: LS1 Corvette Technical Info, Internal Engine, External Engine, Tech Topics, Basic Tech, Maintenance, How to Remove & Replace Sponsored by
Karl Chevrolet

Welcome to Corvetteforum.com!
Welcome to Corvetteforum.com.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, join Corvetteforum.com today!


Corvette Store
 
 
C7 Parts & Accessories
C6 Parts & Accessories
C5 Parts & Accessories
C4 Parts & Accessories
C3 Parts & Accessories
C2 Parts & Accessories
C1 Parts & Accessories
Wheels & Tires
Sponsored Ads
 
 
Vendor Directory
  
Reply
 
 
 
 
Thread Tools Search this Thread
Old 04-03-2013, 08:23 AM   #21
dadaroo
CF Senior Member
 
Member Since: Mar 2011
Location: Columbia SC
Default

I do not understand what you did, what he used, and where was it connected. More info is needed to use in our analysis. We know the VSS signal is getting to the DIC/cruise control, and active handling (ECBM) so we need to know more about what he did.With that said I am thinking it is the actual speedometer but until I can rule out the last few things I am not ready to recommend a root cause (this I would like to have Lionelhutz agree with before we start replacing parts). I plan to call an IPC repair shop this morning and find out if the initial sweep is internal or from the PCM. That info is critical for me.

Also, do the other gauges sweep normally at startup? I don't have my car here at home but as I remember at least the Tach and the speedo do. I think all the gauges do this.

Did you disconnect the battery for a few minutes and see if that did anything?

Once I get the above info we can assess where we are at and see if we need to inspect the PCM (I don't think you have not done that yet)

See you again soon (here). Sam
dadaroo is offline   Reply With Quote
Old 04-03-2013, 09:11 AM   #22
dadaroo
CF Senior Member
 
Member Since: Mar 2011
Location: Columbia SC
Default

I have talked with one repair service and they say the gauges sweep on IPC powerup (IPC gets voltage applied)and are not swept by the PCM. I plan to call another shop to get confirmation but they are in California and so I need to wait until they open in a couple of hours.
dadaroo is offline   Reply With Quote
Old 04-03-2013, 09:54 AM   #23
lionelhutz
CF Senior Member
 
lionelhutz's Avatar
 
Member Since: Apr 2007
Location: South Western Ontario
Default

The hand-held test tells us nothing new. We already knew the PCM was receiving the speed data.

The speedo not sweeping would make me believe the cluster does have an issue but without checking the wiring and testing the PCM output I can't say that is the only issue.
lionelhutz is offline   Reply With Quote
Old 04-03-2013, 10:41 AM   #24
SteveDotenMotorsports
Former Vendor
Cruise-In VII Veteran
 
SteveDotenMotorsports's Avatar
 
Member Since: Sep 2003
Location: Farmington/DeerPark CT/NY
Default

your in Austin TX; home of 3500 Corvettes.

I'd swap out the cluster in 20 minutes and then go the T/S route.

The VSS(vehicle speed sensor/signal) is on the top of the diff, one bolt, 2 wires, is she plugged in??

I have clusters in stock ready to ship if needed.

HTH

Steve
SteveDotenMotorsports is offline   Reply With Quote
Old 04-03-2013, 11:40 AM   #25
dadaroo
CF Senior Member
 
Member Since: Mar 2011
Location: Columbia SC
Default

Phil, I talked with the other repair shop. They agreed IPC gauge sweeps are done internal to the IPC and are not dependent on the PCM. They said the motor is bad or there is an internal power issue to the motor. My assessment is you need the IPC repaired or replaced. Hopefully it will resolve the PCM code, I think it will. If it were me I would address the IPC first since it appears to be bad based on my opinion and that of 2 repair shops. I would like Lionelhutz to weigh in on this so he either agrees or we look at this further before you remove the IPC.

PS: If you do remove the IPC you might consider installing a HUD. That is if you want to have one. I love mine.
dadaroo is offline   Reply With Quote
Old 04-03-2013, 01:29 PM   #26
silver twin
CF Senior Member
 
Member Since: Mar 2013
Location: Austin TX
Default

The hand held was a MAC tool and was plugged into the port under the dash.
Phil
silver twin is offline   Reply With Quote
Old 04-03-2013, 07:07 PM   #27
lionelhutz
CF Senior Member
 
lionelhutz's Avatar
 
Member Since: Apr 2007
Location: South Western Ontario
Default

Yes, Steve the sensor is plugged in and working. We established that days ago.

The handheld plugged into the diagnostic port is reading the speed data from the PCM via the OBDII serial port. Knowing that is working really doesn't help because we already established the PCM is reading the speed when you tried the cruise control and the cruise worked and displayed the set speed on the DIC.

The speedo not sweeping says the cluster does have an issue. As I posted before, the speedo stepper motor being stuck or burned out doesn't really explain why the PCM thinks the dedicated VSS signal circuit has failed. Possibly, the motor burning out also burned out the circuitry for that dedicated VSS signal. The only way to know is to try another cluster.
lionelhutz is offline   Reply With Quote
Old 04-03-2013, 07:23 PM   #28
silver twin
CF Senior Member
 
Member Since: Mar 2013
Location: Austin TX
Default

lionelhutz
So it looks like were leaning toward a bad speedo,knowing this would you buy a new one a used one or have the original fixed. If I buy used or new I would still have to send it of so that it can be programed with the correct mileage,the cost seems to be close either way I go.
Phil
silver twin is offline   Reply With Quote
Old 04-03-2013, 07:39 PM   #29
lionelhutz
CF Senior Member
 
lionelhutz's Avatar
 
Member Since: Apr 2007
Location: South Western Ontario
Default

I might just try to find one close mileage and stick it in, but that would be breaking the law. Yes, any used one would have to be programmed if you wanted it to be correct. I have no idea what the costs of the different options would be in your area so pick the option that seems best. You could use any possible warranty as the deciding factor.

There is a circuit board on the back that holds the mileage info and it is fairly easy to swap. However, I couldn't tell you if it could be part of the problem or not. You could try the used cluster first and if it works then swap the board and see if it still works.
lionelhutz is offline   Reply With Quote
Old 04-03-2013, 07:53 PM   #30
SaberD
CF Senior Member
 
SaberD's Avatar
 
Member Since: Nov 2008
Location: Troy MI
Send a message via AIM to SaberD
Default

put 100k miles on it and then fix it since the odo isnt going up. sell it as a low mileage car hahaha. really though please don't.
SaberD is offline   Reply With Quote
Old 04-04-2013, 07:54 AM   #31
dadaroo
CF Senior Member
 
Member Since: Mar 2011
Location: Columbia SC
Default

If it were me, I would get it fixed since it should be cheaper and would keep the mileage. With that said, see if the local dealer can fix the mileage, that might affect how you think about options. Keep us posted on how things go and if that resolves all the speedo issues or not.
dadaroo is offline   Reply With Quote
Old 04-04-2013, 07:54 AM
 
Go Back   Corvette Forum > C5 Corvettes, 1997 - 2004 > C5 Tech
Reload this Page speedometer problem
 
 
 
Reply


Thread Tools Search this Thread
Search this Thread:

Click for Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Should I sell my ZR1 and get a Prius? Crabbers C6 Corvette General Discussion 47 08-30-2014 09:51 PM
So, just for fun, I test drove a Tesla tonight Thud Off Topic 102 08-06-2014 09:27 PM
A poll-should Tadge remain Corvette CE? petermj C7 General Discussion 79 03-26-2013 11:15 AM
Weatherstrip question cwaynem C3 Tech/Performance 9 12-01-2012 01:38 PM
Witch way to prime my oil pump? CW or CCW? Zane C3 Tech/Performance 6 01-18-2002 10:56 PM


All times are GMT -4. The time now is 03:46 AM.


Emails & Password Backup