Speedometer Calibration Problem
Thread Starter
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Junior Member
Joined: Jul 2013
Posts: 3
Likes: 0
From: Virginia
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!
Senior Member
Joined: Dec 2004
Posts: 5,003
Likes: 27
From: Dover AFB DE / Harrisburg PA
Thread Starter
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Junior Member
Joined: Jul 2013
Posts: 3
Likes: 0
From: Virginia
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!