VSS - cluster jumping - no ABS - no CC - code 24
Thread Starter
Racer
Joined: Oct 2007
Posts: 442
Likes: 15
From: FL
VSS - cluster jumping - no ABS - no CC - code 24
1986 AT, most likely stock, not sure about gears
The speedo readings jump and when cold, the speedo doesn´t show any reading at all. When warmed up, the reading jumps, but most of the time is waaayyy to low, compared to the readings on the GPS speedo on my mobile phone. Consequently, mileage and range are off as well (although the fuel gage is off, too, mostly showing FULL). The cluster didn´t work at all when I got the car. I swapped it and now most of the readings are ok, except for speed and fuel.
At first I thought I might have plugged in the cluster connectors wrongly, maybe bending a pin, but now rather lean towards a bad VSS, as I get a code 24. Could it be simply a bad VSS connector or broken wire?
Where to source a new VSS? The regular parts guys don´t seem to have them. Is 25007224 is the correct P/N? Is there a replacement/other solution with a different type of VSS?
Provided the VSS was at fault, could this also be the reason for the ABS pump not doing it´s test cycle upon take-off? Could a faulty VSS also keep the CC from coming on?
The speedo readings jump and when cold, the speedo doesn´t show any reading at all. When warmed up, the reading jumps, but most of the time is waaayyy to low, compared to the readings on the GPS speedo on my mobile phone. Consequently, mileage and range are off as well (although the fuel gage is off, too, mostly showing FULL). The cluster didn´t work at all when I got the car. I swapped it and now most of the readings are ok, except for speed and fuel.
At first I thought I might have plugged in the cluster connectors wrongly, maybe bending a pin, but now rather lean towards a bad VSS, as I get a code 24. Could it be simply a bad VSS connector or broken wire?
Where to source a new VSS? The regular parts guys don´t seem to have them. Is 25007224 is the correct P/N? Is there a replacement/other solution with a different type of VSS?
Provided the VSS was at fault, could this also be the reason for the ABS pump not doing it´s test cycle upon take-off? Could a faulty VSS also keep the CC from coming on?
Racer
Joined: Aug 2020
Posts: 362
Likes: 81
From: Indianapolis
Not a transmission guy by any stretch, but your symptoms are identical to mine when I tried to use an Abbot unit on my 4L60 auto after swapping rear gears. The jumping speedo would lead me to believe--like me--your VSS is sending bogus signals. I'd first look under the car for simple connection issues as you suggest. If all looks right, I would indeed get another VSS. Doubt you'll find a New GM one, it'll be a salvage yard search. I don't know the unit you need, but should be a fairly easy google search.
I don't know what, if any, procedure there is to test a VSS-- might ask someone to peek in their FSM for you. My '93 has an entirely different VSS than you, otherwise I'd take a peek.
Ronn
I don't know what, if any, procedure there is to test a VSS-- might ask someone to peek in their FSM for you. My '93 has an entirely different VSS than you, otherwise I'd take a peek.
Ronn
