[wags391]

Sporadically, but it's also affecting the speed reading on the ECM. I use WinALDL to read the ECM and the speed on there jumps around just as much as the speedo. Everything that the DRAC has an output to is affected.

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Other symptoms:
When I let go of the gas pedal and just cruise, the speedo needle goes to zero.
If I drive for about 15 minutes at a good speed, as soon as I let go of the gas and cruise down an exit ramp, the SES light comes on, then off.
Code stored- 24 (Vehicle Speed Sensor)
Something strange (maybe a wiring issue)- When taking sharp left turns only, the speedo travels back to normal.
The speedo dances a little at stop lights, at idle.

I suppose a better check of physical wiring issues is in order.

Wags

 

[wags391]

Thanks, I'll start looking at wiring today. Do you of any junctions in the wiring, or is it a straight shot? Does the VSS wiring go through the wiring block on the firewall? Also, would this issue affect transmission shifting? Does it send signal to the TCC? I've been dealing with transmission issues for months now. I'm wondering if this is related.

And I'll keep the posting where it's supposed to be. Thanks!

 

[wags391]

I do not have the electronic shift transmission. It's a 4L60/THM700/MD8. But, one problem at a time. I need to get this DRAC issue fixed up, then move on to the transmission problem and the engine idle dipping/shutting off problem.

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Well, you were right. Found this on the transfer case VSS extension wiring:

Taped them up and now it all works. Only took a couple months and $120 in parts.....
Anyway, it works again and I sure know how that system works now. Time to move on to transmission and engine issues.

This one is solved. Lesson learned: check all wiring first!

Thanks.

 

[wags391]

I lied. Must be another wiring issue somewhere.... suck.