Spedo not working OD light flashing
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Elder User
Joined: Dec 2011
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From: Kodiak, Alaska
Spedo not working OD light flashing
Let me first say that this is my first Powerstroke truck. I am already not a big fan of the E4OD at all from my many bad experiences with them behind the old IDI's.
My speedometer is not working on my 97 Powerstroke and I believe it is because I accidentally blew the #8 fuse while testing the door buzzer QD under the dash it popped when I accidentally touched the piece of wire I had wrapped around the lead to the mounting bracket while testing the top middle brown wire. I replaced the 15A fuse. I got in the truck this morning and my speedometer isn't working and the OD light is flashing and it is shifting rough. The #8 fuse is not blown nor are any other fuses. Please any help is appreciated.
My speedometer is not working on my 97 Powerstroke and I believe it is because I accidentally blew the #8 fuse while testing the door buzzer QD under the dash it popped when I accidentally touched the piece of wire I had wrapped around the lead to the mounting bracket while testing the top middle brown wire. I replaced the 15A fuse. I got in the truck this morning and my speedometer isn't working and the OD light is flashing and it is shifting rough. The #8 fuse is not blown nor are any other fuses. Please any help is appreciated.
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Elder User
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From: Kodiak, Alaska
No I haven't pulled them. Would the codes show up on the engine code reader or is there a different spot to test the trans? Also is it going to hurt the truck to drive like this? I will pull the VSS and clean the connections and test the resistance, anyone know what the resistance should be?
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Elder User
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From: Kodiak, Alaska
Ok so I did determine it is not the VSS I cleaned it and re installed with the same results it measures 1022 ohms across the pins. I also tried it with the one off my other truck and had the same result. I did check the #8 fuse again and realized i have no voltage to the dome light or door buzzer witch are on the same circuit. I have 12v on both sides of the fuze. So does anyone have any suggestions as to what could be wrong beyond the fuse box and before where all of the things on that circut split off? Whatever it is that they all have in common beyond the fuse box is what I think is wrong.
Lead Driver
Joined: Oct 2003
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From: Madison, WI
Does the odometer show a number?
PCM controls (and stores codes for) both the engine and the automatic tranny, so yes, a reader that communicates with our trucks will retrieve tranny codes via the OBD-II port.
PCM controls (and stores codes for) both the engine and the automatic tranny, so yes, a reader that communicates with our trucks will retrieve tranny codes via the OBD-II port.
Frmr Ford Trans Engr
Joined: Aug 1999
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From: SE Florida
OK, I read this and I don't see how you have determined the VSS is good. Without reading the codes I don't see how you really know anything about what's good and what isn't good.
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Elder User
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From: Kodiak, Alaska
I will admit I am not a wiz at electronics but I tried a different VSS from my other truck that I know works and still nothing. The big indicator that it is coming from the #8 fuse circuit is that nothing on that circuit works (no speedometer, odometer, dome light or door buzzer.) the #8 fuze is however not blown and I have 12v on both sides of the fuse but nothing on the circuit seems to work.
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Fleet Mechanic
Joined: May 2005
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From: Vale, NC
I will admit I am not a wiz at electronics but I tried a different VSS from my other truck that I know works and still nothing. The big indicator that it is coming from the #8 fuse circuit is that nothing on that circuit works (no speedometer, odometer, dome light or door buzzer.) the #8 fuze is however not blown and I have 12v on both sides of the fuse but nothing on the circuit seems to work.
Lead Driver
Joined: Oct 2003
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From: Madison, WI
I'd say you're on the right track. A bad VSS shouldn't cause a blank display, it would just cause the number to remain the same. Since there's no display, the other major suspect is the PSOM. Can you get your hands on a spare cluster from the boneyard? Swap it in momentarily, just to see if the speedo works and it fixes the shifting.
Hmm, might be interesting to try disconnecting the cluster, or at least the PSOM connector, and see if that restores dome light ops.
Hmm, might be interesting to try disconnecting the cluster, or at least the PSOM connector, and see if that restores dome light ops.
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Elder User
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From: Kodiak, Alaska
I got a chance to check the codes this is what I got, P0603, PCM Processor Keeping Alive Memory (KAM) Error and P0500, VSS malfunction. Both of these things point to the #8 fuse circuit. I do not have access to a good cluster, the junk yard here has no diesels in it and definitely no powerstrokes. I will see if unpluging the PSOM does anything.
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Elder User
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From: Kodiak, Alaska
I hate to even get involved because I am NO electrician by any means, but if you have power across the fuse but nothing is working, then wouldn't that suggest a short somewhere between the fuse and the components? Wouldn't that mean it is grounding out somewhere? My apologies if that is too simple or wrong, but I would be tracing wires to see if something got pinched.... course, I might spend months dealing with something like this!
Lead Driver
Joined: Oct 2003
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From: Madison, WI
You don't need a diesel cluster for the test. Any OBS with a working PSOM will do. I would have to scan the EVTM pages for the diagram(s); won't have time 'til tomorrow evening. Someone might have a digital version.
Odometer is stored in the PSOM. PSOM is actually the "brains of the operation" wrt. speed/distance. Another brilliant Ford idea. VSS feeds the PSOM directly. IT then sends a signal to the PCM, which uses it to control tranny shift points, etc. So it's one more failure point, as situations like this make painfully evident.
Odometer is stored in the PSOM. PSOM is actually the "brains of the operation" wrt. speed/distance. Another brilliant Ford idea. VSS feeds the PSOM directly. IT then sends a signal to the PCM, which uses it to control tranny shift points, etc. So it's one more failure point, as situations like this make painfully evident.
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Elder User
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From: Kodiak, Alaska
I will try to make a trip to the junk yard tomorrow and find a different cluster to try. I am not convinced that it is any one component that is bad due to the fact that nothing on that circuit works, is there a fusible link or something beyond the #8 fuse on the fuse panel in the cab of the pickup? I really need a good wiring diagram to go any further. Thanks for the input so far everybody.