2000 F350 Speedometer

Tiny
NEWTC84
  • 2000 FORD F-350

I have a 2000 F350 Diesel that had a good speedometer when I bought it. Shortly after, it stopped working. With the speedo wne the odometer and the cruise. The OD light is flashing. When I had it plugged in I got the code for vehicle speed sensor, but I had those replaced and nothing still. I took it back in and they said the problem is the signal from the speed sensors is getting lost somewhere between the abs module and the PCM. They checked the abs system and it had no codes or problems. So does that mean my PCM is bad? Also, the speedo comes on from time to time, then goes out again. Also, if it is the PCM, where is that located so I can take it out and have it tested? Thanks.

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Monday, June 18th, 2007 AT 3:05 PM

25 Replies

Tiny
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Okay, I disconnected the wires from the front of the master cylinder reservoir. When I drove it everything was the same, no speedo, etc. Only difference was the brake light on the dash was illuminated.

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Tuesday, June 19th, 2007 AT 11:14 AM
Tiny
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Okay, I measured the terminals with the wires disconnected from the reservoir. I am not sure if I am doing it right, but I was measuring on D/C, and A/C in volts and the reading I got was 3.5 to 3.6 volts in D/C and in A/C it was around 4.2 volts. Is that the number you wanted? Also, the vehicle is 2wd, and I believe it is only rear ABS. It is the basic XL model with no options, so I would not think it has 4 wheel anti lock. Is there any way to know for sure?

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Wednesday, June 20th, 2007 AT 12:57 PM
Tiny
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Hello, I found out how to test resistance which is what you asked for. The reading I got was 6.00, however the setting was set to 20K ohms. So I am assuming that means the reading I got was 6000 ohms? I am not sure how these work, but that is what I think. What would you like me to do next?

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Wednesday, June 20th, 2007 AT 1:20 PM
Tiny
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Hello, Sorry I was not sure what you wanted before. I just measured with the Ohms set at 2000 across the speed sensor terminals, with the sensor out of the truck and the reading was 1.997. I will stay close to the computer now. I was not expecting such a quick response. Thank you.

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Wednesday, June 20th, 2007 AT 2:41 PM
Tiny
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Okay, I tested the sensor at 200 ohms and it just gave me a reading of 1, meaning the reading was higher than the setting. At 2000 ohms setting I got readings of 1.997. Yes I inspected the wires and the terminal and found that they looked good. The wires were red, and green with a black stripe. What would you like me to do next?

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Wednesday, June 20th, 2007 AT 7:25 PM
Tiny
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I tested the two wires that lead back to the sensor at the fender. It gave me no reading at all. I was still on 2000 ohms and there was no reading. Does that mean I have faulty wires somewhere between the sensor and that connection?

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Wednesday, June 20th, 2007 AT 8:41 PM
Tiny
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Is there any way to test the wires in different spots to try and pinpoint where I am losing the signal?

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Wednesday, June 20th, 2007 AT 9:23 PM
Tiny
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Thank you very much for your help! This problem has given even the best shops in my city a tough time. Thanks again.

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Wednesday, June 20th, 2007 AT 10:40 PM
Tiny
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Not yet. I think I am going to work on it tomorrow. I'll let you know when I find it.

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Thursday, June 21st, 2007 AT 12:08 AM
Tiny
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Hello again,
I made a mistake yesterday. I had the meter at the wrong setting. I tried again today at the correct setting and I tested the harness at the fender, it gave me the same reading that I got from the sensor. So the wiring is giving a good signal up to that point. Sorry about that. I need to continue testing. What is the next step?

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Thursday, June 21st, 2007 AT 4:52 PM
Tiny
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I removed the driver side battery and pan that it sits in. Is the ABS module silver and has the brake lines going into it? I can not see any wires going into it. What wires am I going to be testing? Can you explain?

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Thursday, June 21st, 2007 AT 6:03 PM
Tiny
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Never mind, I was able to access the wires from underneath the fender well. I will test the same two wires now.

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Thursday, June 21st, 2007 AT 6:23 PM
Tiny
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I found the wires. I had to access them from underneath, not from the top. I tested them at the plug. Same reading as before. Now the next step requires 2 people right? Lift the rear wheels off the ground, make a nick in the black/grey wire at the ABS module, then turn meter to low ac volts, and have someone turn the rear wheels as fast as they can, right? Making sure the black lead goes to ground and the red to the black, grey wire. With the ABS module plugged back in.

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Thursday, June 21st, 2007 AT 6:46 PM
Tiny
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Does it matter which rear wheel is spun? And which direction? Also, the ground lead from the meter means just touching it to metal, right? Just want to make sure I do it right.

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Thursday, June 21st, 2007 AT 7:37 PM
Tiny
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I had someone spinning the rear wheels while I tested the wires. I had the meter set at 200mV. The initial readings I was getting were around 10.0. As the wheels were turned the readings went up to around 25.0. What is the next step?

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Thursday, June 21st, 2007 AT 8:55 PM
Tiny
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Hello, I'm sorry I don't really understand the last instructions totally. The instrument cluster meaning all of the guages from the dash? Then I don't really understand where to put the two lead ends? One at the wheelwell, and the other where? I can't quite picture what you want for me to do.

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Friday, June 22nd, 2007 AT 12:30 PM
Tiny
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Okay, I got the instrument cluster out and I found the black/grey wire. It is firmly connected. Now, could you walk me through how to test the integrity of the wire again, please?

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Friday, June 22nd, 2007 AT 4:17 PM
Tiny
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Okay, I got it. I did that and I got the same reading, showing consistency through the wire. So, you said that means I have a bad cluster?

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Friday, June 22nd, 2007 AT 4:52 PM
Tiny
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Just curious, why does the cruise go out also, when the speedometer and odometer do? Is it connected to them somehow?

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Friday, June 22nd, 2007 AT 5:16 PM
Tiny
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Yes. Let's pursue a little further. Becuase they all go out at the same time. Cruise, speedo, odometer, etc. Also, they have come back on on occasion too. When the speedo is back, the cruise is as well. I would like to pursue further. Tell em what to do.

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Friday, June 22nd, 2007 AT 6:15 PM

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