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Old 08-02-2010, 01:53 PM
Fordaholic Fordaholic is offline
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Question Speedo and Odo at 50%, 4x4 lights stuck on

Hi yall! New to this site, just curious on my current electrical problem. I own a 2001 ranger 4.0l 4x4. Out of nowhere both my 4x4 lights come on, and the Speedometer and Odometer starting operating at 50%. Ex: I go two miles, it records 1 mile, I go 50 mph, it says 25 mph. Also the 4x4 lights came on although the 4 wheel drive did not engage. I am assuming it is the speedo sensor on the rear axle? But could it be anything else? Just confused because I thought if that sensor were to just go, then all mph and odomoter reading would be gone with it, not 50%. Any insight would be greatly appreciated! Thanks a lot!
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Old 08-02-2010, 03:50 PM
rwenzing rwenzing is offline
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Default Re: Speedo and Odo at 50%, 4x4 lights stuck on

In 2001, the sensor on the top of the rear diff is for the ABS only. The 2001 raw speedometer signal comes from the OSS sensor in the transmission case (automatic) or in the extension housing (manual). The OSS could possibly be bad but doesn't often fail.

Actually, I think that your problem is not in the speedometer system at all. The speedometer is corrected by a multiplier in the PCM whenever the 4x4 Low indicator light is on. It makes the speedometer read lower to correct for the 2.48:1 gear reduction in the transfer case. I believe that whatever is causing that 4Low light to be on incorrectly is also causing the speedometer error. Get the electronic 4WD fixed and the speedometer problem should go away too.
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