Speedometer Calibration Problem
#1
07-14-2013, 08:39 PM
Join Date: Jul 2013
Location: Virginia
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Speedometer Calibration Problem
Hello All,
First post here since joining the forums. However, I have been using the forum for help for about a year before I joined. Glad to finally be a member!
Anyway, I have a 1994 Ford F150 XL 4.9 5-speed with about 177k. I bought it about a year ago. It came with 32x11.50x15 BFGs. The speedometer/odometer is off (.9 on odometer equals 1 mile). With that said, I have become very familiar with the following article and Youtube video:
http://www.ford-trucks.com/article/i...ND_BRONCO.html
As per the article, I start having problems when I get to the following steps:
Press and release RESET button again and PSOM conversion constant (without the decimal point) followed by the word CAL.
Press and release the odometer SELECT button as many times as necessary to change conversion constant to the correct value.
Whenever I get to the second step, I am unable to change the conversion constant by pressing the Select button. I have tried several times and it just remains at 972CAL. When I started this process, I remembered to check to see how many change opportunities I had left. At the beginning of the process, the odometer reads E 08 6. Doesn't that mean I have 6 speedometer change opportunities left? I am using an alligator clamp wire to connect the Circuit #567 (LB/Y) to the frame for grounding. What else could I be missing here?
I have tried searching the forums for this issue, but I have not found a solution. If I have missed it, my apologies!
Thank you in advance for your help!
First post here since joining the forums. However, I have been using the forum for help for about a year before I joined. Glad to finally be a member!
Anyway, I have a 1994 Ford F150 XL 4.9 5-speed with about 177k. I bought it about a year ago. It came with 32x11.50x15 BFGs. The speedometer/odometer is off (.9 on odometer equals 1 mile). With that said, I have become very familiar with the following article and Youtube video:
http://www.ford-trucks.com/article/i...ND_BRONCO.html
As per the article, I start having problems when I get to the following steps:
Press and release RESET button again and PSOM conversion constant (without the decimal point) followed by the word CAL.
Press and release the odometer SELECT button as many times as necessary to change conversion constant to the correct value.
Whenever I get to the second step, I am unable to change the conversion constant by pressing the Select button. I have tried several times and it just remains at 972CAL. When I started this process, I remembered to check to see how many change opportunities I had left. At the beginning of the process, the odometer reads E 08 6. Doesn't that mean I have 6 speedometer change opportunities left? I am using an alligator clamp wire to connect the Circuit #567 (LB/Y) to the frame for grounding. What else could I be missing here?
I have tried searching the forums for this issue, but I have not found a solution. If I have missed it, my apologies!
Thank you in advance for your help!
#3
07-23-2013, 04:15 PM
Join Date: Jul 2013
Location: Virginia
Posts: 3
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Got it!
Thanks for the link.
When I first tried to do this job, the PSOM was not properly grounded. I tried a different alligator clip wire for grounding and I was able to change the conversion constant right away. After I made the changes, I did a road test and the speedometer displayed the correct speed. Problem Solved!
When I first tried to do this job, the PSOM was not properly grounded. I tried a different alligator clip wire for grounding and I was able to change the conversion constant right away. After I made the changes, I did a road test and the speedometer displayed the correct speed. Problem Solved!