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FAULT CODE 286

SAE J1939 Multiplexing Configuration Error - Out of Calibration

Overview


CODE

REASON

EFFECT

Fault Code: 286

SAE J1939 Multiplexing Configuration Error - Out of Calibration. The engine control module

At least one multiplexed

PID:

(ECM) expected information from a multiplexed device but only received a portion of the

device will not operate

SPN: 639

necessary information.

properly.

FMI: 13



LAMP: Amber



SRT:



SAE J1939 Multiplexing Configuration - Industrial Eng


SAE J1939 Multiplexing Configuration - Power Generation


SAE J1939 Multiplexing Configuration - Marine Engi


Circuit Description

Normally, switches, accelerators and other components are connected to the ECM directly through individual wires. Multiplexing allows those same components to be hard wired to an OEM vehicle electronic control unit or transmission electronic control unit in the cab. Then component values and states from components such as sensors, accelerators and switches can be transmitted from the original equipment manufacturer (OEM) vehicle electronic control unit to the Cummins® engine ECM over the SAE J1939 data link.


Messages sent from an OEM vehicle electronic control unit or transmission electronic control unit are received by the Cummins® engine ECM and used for controlling the engine. The Cummins® ECM and OEM vehicle electronic control unit(s) must be configured properly so that proper operation of the multiplexed components will occur.


Component Location


The engine ECM is located on the intake side of the engine. The SAE J1939 data link wiring and vehicle electronic control unit location varies by OEM.


Shop Talk


This fault can occur when the ECM is set up properly (components enabled and OEM vehicle electronic control unit source addressed correctly) to receive information from an OEM vehicle electronic control unit, but the OEM vehicle electronic control unit is actually transmitting a message that says that component is not available for multiplexing. INSITEâ„¢ electronic service tool can monitor multiplexed components.


Refer to Troubleshooting Fault Code t05-286.


Last Modified: 29-Nov-2012

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