First of this is on a 90 blazer with the TBI 350. I just changed out the spark plugs and drove into town for a test drive I got about halfway back home and the speedometer quite and the brake warring light came on. I still had the rest of the gauges and power to the dash and no codes where set. Anyone know what might of happened? Any help is much appreciated thanks.
CK5
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Speedometer quite working
- Thread starter de3en16
- Start date
Does cruise still work? That's kind of a rudimentary test of the VSS setup.
I'm *guessing* that the ABS light indicates the fault isn't just with the speedometer, as the DRAC (basically a signal converter from the VSS on the t-case) feeds Speedometer, Cruise, ABS, and the ECM. Pull the ABS code see if it's VSS related.
Would be helpful additionally to see if the ECM is getting a speed signal. I believe you'd get a code if it wasn't though. Someone else might be able to comment on that.
I would think it would be unlikely to be related to your plug wire changing, the DRAC is under the dash, and the VSS wiring to it is fed through wires under the truck into the cab, not much of which runs through the engine bay I assume. The ABS obviously has a bunch of junk in the engine bay, but if it's a wiring issue, probably not too many on the ABS module or whatever it's called in the engine bay.
I'm *guessing* that the ABS light indicates the fault isn't just with the speedometer, as the DRAC (basically a signal converter from the VSS on the t-case) feeds Speedometer, Cruise, ABS, and the ECM. Pull the ABS code see if it's VSS related.
Would be helpful additionally to see if the ECM is getting a speed signal. I believe you'd get a code if it wasn't though. Someone else might be able to comment on that.
I would think it would be unlikely to be related to your plug wire changing, the DRAC is under the dash, and the VSS wiring to it is fed through wires under the truck into the cab, not much of which runs through the engine bay I assume. The ABS obviously has a bunch of junk in the engine bay, but if it's a wiring issue, probably not too many on the ABS module or whatever it's called in the engine bay.
Do you still have an ABS error?
Does seem odd the heater/AC one is tied into VSS (or ABS potentially) at all.
Does seem odd the heater/AC one is tied into VSS (or ABS potentially) at all.
Nope the ABS waring light went out also. But what I'm trying to figure out now is why the A/C fuse went out in the first place with out nothing but the VSS running. It's happen a few times now. I wondering if its not the the spark plug wire arcing out on a heater A/C component and its back feeding into the fuse to pop it. Or that circuit all of sudden developed a bad short.
