Code 24???

[TommyL]

oh ohhhhhhhhh whatever will I do??? I did manage to get one from GM a few years ago and as i recall it wasnt the same part number as the books called for. hmmmmmm that kinda sucks! another part we will all need at some point.

I will figure something out!

Tom, did your Service ride control light come on and give you a code 23?

[TommyL]

yes and no Jeff, The light did come on but, I didn't get a code 23... I will take it out for run today and check it again. What would a code 23 mean when combined with the code 24? Last time I had it out, the speedo would work intermitently...it would read 0 then would read the proper mph.

Originally Posted by TommyL

yes and no Jeff, The light did come on but, I didn't get a code 23... I will take it out for run today and check it again. What would a code 23 mean when combined with the code 24? Last time I had it out, the speedo would work intermitently...it would read 0 then would read the proper mph.

Code 23 on the SRC is loss of vehicle speed. If you are not setting that code, the issue is not the VSS, as it get the signal from the same source.

[TommyL]

hmmm what would be the most likely cause of a 24?

[XfireZ51]

Originally Posted by TommyL

hmmm what would be the most likely cause of a 24?

That's what the diag tree in the FSM is for.

[TommyL]

Honestly, I havent had time to play around with it yet and I dont have a scan tool. I will have to make time tomorrow to take a serious look into this. I was hoping I could change the sensor and voila fixed....too easy perhaps.

[TommyL]

Ok heres the scoop....When I took the 90 out for a spin today the speedo reads 0 until I get to 30 kms the it reads the actual speed. Once I slow for a stop light to below 30 kms the speedo goes back to 0. When I first set out, the engine light came on about 2 blocks from home, stayed on for about a block then went out and did not come back on. The suspension light did not come on and all 3 settings are working. This is weird as the car, once warm, runs perfect, even the cruise control works. I am currently running a DRM prom and I am going to change it out for the original prom and see if that makes a differance. I have the week off so I can play around with it. GRRRRRR wish I had a scan tool (Tech one) or something to run while driving the car.

Well, if your SRC light is not coming on, you don't have an issue with the VSS.

You really need a scan tool to do the diag correctly. Mainly to see if the speed is being generated. Even if you had a open ckt or grounding issue, the SRC light would illuminate.

Possible issues
Ride controller has gone tits up.
ECM
MEM-cal

Get a hold of Dwight, he has a Tech 1. He leaves for New York on Wednesday. He also is having a code 24 error, but needs to replace his heater core first.

[TommyL]

Fixed!!! Turned out to be the speed sensor after all. When it was taken apart, I noticed the inner gear is chewed slightly and looks like its on its way out. I'm hoping the inner gear will last a few years so when I take it all apart, I can put a new clutch/pressure plate and a short shifter all at the same time.

Thanks for the help Jeff.