speedo problems revisited
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Elder User
Joined: Jul 2007
Posts: 893
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From: Lawrenceburg, TN
speedo problems revisited
i posted a while back about my speedo not working (im shure "the regulars" rember) well i finally got arround to replacing the speed sensor in the rear diff and it did not fix my problem. i have already checked grounds as reccomended on my orginal post. i may have missed one somewhere but everything seemed ok. maybe someone can repost where the grounds are so i can double check make shure i didnt miss one. any other suggestions as to why my speedo works sometimes and sometimes it dont?
Lead Driver
Joined: May 2007
Posts: 8,607
Likes: 13
From: Belair md
i dont mean to sound ignorant but i am getting ready for bed, if nobody has posted a diagnostic subroutine by tomarrow i will dig it up and post it for you, it sounds like youo have either a bad PSOM or a loose wire somewhere, i will be on tomarrow night and check this post first and if there is no links i'll throw one up
Posting Guru
Joined: Oct 2005
Posts: 1,305
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From: Wisconsin
i had this same PITB problem. it ended up being bad wires from the PCM to the VSS. take you ohm tester and thest those wires!
a simple way to test the PSOM is to press and hold the select {i think thats the putton}button on the dash for 2-5 seconds, and your speedo tack should go all the way over to 85 and back down smoothly and will also say some numbers in the ODO reading gauge i dont remember what the numbers were but if ur speedo tack moves it should be fine.
also did u check that exiter ring while u had the VSS out? make sure its not loose or boogered up.
good luck
Mitch
a simple way to test the PSOM is to press and hold the select {i think thats the putton}button on the dash for 2-5 seconds, and your speedo tack should go all the way over to 85 and back down smoothly and will also say some numbers in the ODO reading gauge i dont remember what the numbers were but if ur speedo tack moves it should be fine.
also did u check that exiter ring while u had the VSS out? make sure its not loose or boogered up.
good luck
Mitch
Logistics Pro
Joined: Jul 2001
Posts: 4,137
Likes: 41
From: Marble Falls, Texas
Good point 79, The truck I'm trying to sell has the reluctor ring all chewed up from where the previous owner had splattered a set of gears. The speedo works fine until about 40mph then it starts bouncing. Check the reluctor out for sure.
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Elder User
Joined: Jul 2007
Posts: 893
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From: Lawrenceburg, TN
reluctur ring good. i did a fluid change/inspection cause i found metal on the vss on the first round. there was a little bit of metal on it again when i put the new one in yesterday but not much.
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