Here is the instruction show you guide on how to solve Massey Ferguson Tractor 6700 trouble code SPN 84, FMI 3, Vechicle speed sensor short to high SOURCE.
Preparations:
Description
The EEM4 monitoring system has detected a short circuit on the vehicle speed sensor.
Possible causes are:
The speed sensor wiring is defective (Shorted to high source.)
The speed sensor is defective
Reaction in EEM
The FC is stored and the warning lamp is activated. The CAN message indicates active fault.
Solution
First save the error log and then erase it. Restart the ECU after erasing the error log. If the fault occurs again during the next driving cycle, check the following paths:
Check the vehicle speed sensor connection to the EEM4, the connectors and the contact surfaces of the connector pins (possible oxidation).
Check the operation with another speed sensor to see if the speed sensor is defective.
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