97 f250 manual tranny. Pcm not receiving speed signal from psom - PowerStrokeNation : Ford Powerstroke Diesel Forum
 
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post #1 of 8 (permalink) Old 05-23-2017, 04:56 PM Thread Starter
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97 f250 manual tranny. Pcm not receiving speed signal from psom

I need help!! My truck cruise control stopped working about a year ago and was associated with an abs and brake light. Easy fix right? So I pull the codes for the abs. Replaced the vss in the rear diff and ended up having to put a new abs valve in the truck. Now all abs and brake problems are fixed but still no cruise control so here's where I get lost. I put my brick on the truck and go for a drive everything in the cruise control system is working all the sensor for the brake and clutch and all the buttons work according to the pcm the only thing that isn't working is the vehicle speed reads 0 all the time. Looking good at the wiring diagram the pcm get its vehicle speed directly from the psom. So I figured that must be something wrong with the psom. Had the whole cluster rebuilt and still no speed signal. I don't know where to go from here. Anyone else no what I should look at next.
What am I missing
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post #2 of 8 (permalink) Old 05-23-2017, 08:49 PM
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Re: 97 f250 manual tranny. Pcm not receiving speed signal from psom

Check the continuity of the wire (I think it's only one wire) from the PSOM to the PCM.
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post #3 of 8 (permalink) Old 05-24-2017, 06:08 PM Thread Starter
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Re: 97 f250 manual tranny. Pcm not receiving speed signal from psom

Ok I will try that
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post #4 of 8 (permalink) Old 05-24-2017, 07:44 PM
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Re: 97 f250 manual tranny. Pcm not receiving speed signal from psom

What's a psom? Anyway, get a meter on the signal wire and see if it's making it there. If it is indeed one wire, then it's going to be a dc signal, so you'll have to look for frequency. If it's two, then just use a.c. volts.

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post #5 of 8 (permalink) Old 05-24-2017, 10:47 PM
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Re: 97 f250 manual tranny. Pcm not receiving speed signal from psom

Programmable Speedometer Odometer Module. And for continuity, you DON'T check voltage. You check... well... continuity. Or check resistance if your meter doesn't have a continuity setting. You're checking a wire, after all.
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post #6 of 8 (permalink) Old 05-25-2017, 12:10 AM
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Re: 97 f250 manual tranny. Pcm not receiving speed signal from psom

Huh?
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post #7 of 8 (permalink) Old 05-25-2017, 01:54 AM
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Re: 97 f250 manual tranny. Pcm not receiving speed signal from psom

You want to make sure there is not an open circuit (circuit 679) from PCM connector pin 58 (GY/BK wire) to PSOM connector pin 7 (GY/BK). You will probably also want to check the same fort the ground associated with that circuit (circuit 676) which is PCM connector pin 33 (PK/O) to PSOM connector pin 2 (PK/O, circuit 676). Cheers!

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post #8 of 8 (permalink) Old 05-28-2017, 11:29 AM
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Re: 97 f250 manual tranny. Pcm not receiving speed signal from psom

Here's a little helper for you, a guide to 92-97 PSOMs:

'92-97 Speedometer (PSOM)

Does your speedo work?
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