A very strange thing happened in my truck the other day. The odometer is switiching back and forth between the mileage and a message that says "ERROR.3"

Does anyone have an idea of what that means or what I should do? The truck has not changed its running condition, the check engine light is NOT on. Can I clear this problem? Is there anything I need to worry about?

Thanks
Chris

 

The problem is internal to the PSOM itself IF there is no other sign of a fault. Just to be on the safe side, pull the codes from the EEC computer to verify that that is the ONLY error/fault present. If you get a Code 11 or 111 back from the computer, its as I mentioned.

Assuming that the problem is "clearable" you can reset the PSOM and recalibrate it. But don't do it more than once. You only get 6 recalibration sessions on the PSOM before it will no longer take any input. Resetting should mean simply disconnecting battery power for a few minutes. Somewhere here (FTE) there is a detailed article about recalibrating the PSOM if necessary but I can't seem to find it right now.

 

I found some information, but am unable to clear out the error. If I turn on the key with the trip odometer reset button pressed, it lets me into some settings, but I don't see how to clear out the Error.3 code.

HELP!!! I want to trade the truck in and the dealer will probably soak me if they see the message. Otherwise the truck is in very nice shape!

 

She's just fighting you because she don't want to be traded in.

 

Just try pulling the neg battery cable for ten min or so then put it back and see if the error message comes back, but before you do this I would check the EEC for codes just in case.

 

Dusted off the old service manual just for you; You need to reprogram the conversion constant.

Reprogram speed conversion constant using the following procedure:

-- Locate the dealer mode programming enable single-terminal connector. The connector is located at the bottom of the instrument panel below the center of the glove box. On all vehicles, the dealer mode enable wire is Circuit 567 (LB/Y).

-- Insert metal clip in service wire panel connector. Clip other end to vehicle ground while the key is in the OFF position.

-- Key to RUN while holding down the trip odometer RESET button on speedometer. Release RESET button.

-- Speedometer will prove out (sweep across dial and back). The English/Metric and revision levels will be displayed. The last number of the display is the dealer mode programming lockout count. This count shows the number of allowable conversion constant changes remaining. When the count is zero (0), no additional changes can be made to this instrument cluster. If a conversion constant change is required, a service instrument cluster must be ordered.

-- Press and release RESET button again and PSOM conversion constant (without the decimal point) followed by the word CAL will be displayed.

-- Press and release the odometer SELECT button as many times as necessary to change conversion constant to the correct value.

Note: Pressing and releasing the RESET button to lock in the new conversion constant reduces the number of times the PSOM can be reprogrammed by one count. The module can only be reprogrammed six times. If you change your mind and want to go back to the old conversion constant, turn the key off before you lock in the new constant.

-- When the correct new value is displayed in odometer window, press and release the RESET button to lock in the new conversion constant.

-- Key off. Remove the ground wire. Verify proper speedometer
operation.

Here is a table of constants (kinda hard to read).