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diagnostic codes

JeremiahSr

JeremiahSr

Well-Known Member
Joined
Sep 10, 2010
Messages
204
Location
Houston, Tx
Occupation
Vice Pres./General man./Technician
The f9c3 is MDU not receiving CAN messages from the ECU. I have ran into that 1 before. The CAN wires go from ecu to mdu. also to monitor and the Service Advisor plug-in. It is the 3 communication wires that is always together. Think even twisted? They are black, yellow and green. Just before harness plugs into the ecu and the mdu is a pig-tail that has a Resistor plugged in. There are 2 of em. The part number is usually on a tag on the Resistor. Ohm all 3 wires to all places to check for restriction. If they seem good then change the resistors.
 
D

deeretech89

Member
Joined
Apr 21, 2016
Messages
5
Location
san antonio, tx
Occupation
diesel tech
well I appreciate it brother my service adviser hasn't been updated and im missing that model but thanks for the info ill look into that in the am
 
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