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3c,
It is no coincidence that the trip & odometer are not working at the same time. The speedometer is electrical receiving data from the ECM. The ECM is receiving data from an inductive sensor sending a signal to the odometer/trip meter and speedometer. Is the speedometer not working as well?
If not, then I would suspect the sensor and/or connection. If the speedometer is working but the odometer and trip meter are not working only as you say, then I'm stumped. One more thing, the trip computer has a self diagnosis built in...when a function is selected and you get a display that says 'DISC', it means that function is disconnected.
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