SPN 639 - FMI 13 (Fault Code 286)

SPN 639 - FMI 13 (Fault Code: 286)
SPN639 FMI13
ISB, ISC and ISL with CM2150 - SAE J1939 Multiplexing Configuration

Fault Code: 286
PID(P), SID(S): S231
SPN: 639
FMI: 13/13

REASON: SAE J1939 Multiplexing Configuration Error - Out of Calibration. The ECM expected information from a multiplexed device but ONLY received a portion of the necessary information.

EFFECT: At least one multiplexed device will NOT operate properly.

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

Component Location:
-The engine ECM is located on the intake side of the engine.
-The J1939 Data link wiring and VECU location varies by OEM. Refer to the OEM troubleshooting and repair manual.

Conditions for Running the Diagnostics:
This diagnostic runs continuously when the keyswitch is in the ON position.

Conditions for Setting the Fault Codes:
The ECM expects to receive a valid J1939 message from a multiplexed device for more than 1 second.

Action Taken When the Fault Code is Active:
• The ECM illuminates the amber CHECK ENGINE light immediately when the diagnostic runs and fails.
• The multiplexed device will not operate.

Conditions for Clearing the Fault Code:
The ECM will turn off the amber CHECK ENGINE light immediately after the diagnostic runs and passes.

Shop Talk:
  • Verify the electronic control module (ECM) calibration is correct. Check the calibration revision history found on QuickServe™ Online for applicable fixes to the calibration stored in the ECM. If necessary, recalibrate the ECM.
  • This fault can occur when the ECM is set up properly (components enabled and OEM VECU source addressed correctly) to receive information from an OEM VECU, but the OEM VECU is actually transmitting a message that says that component is not available for multiplexing.
  • It is possible to use INSITE™ electronic service tool to monitor multiplexed components.

Read More:
SPN 639 - FMI 9 (Fault Code 285)
SPN 1347 - FMI 7 (Fault Code 281)


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