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SPN 91 - FMI 2 / 19 (Fault Code 287)

SPN 91 - FMI 2 / 19 (Fault Code: 287)
SPN91 FMI2
SPN91 FMI19
ISB, ISC and ISL with CM2150 - SAE J1939 Multiplexed Accelerator Pedal or Lever Sensor System

CODES:
Fault Code: 287
PID(P), SID(S): P91
SPN: 91
FMI: 2/19
Lamp: RED
SRT:

REASON: SAE J1939 Multiplexed Accelerator Pedal or Lever Sensor System - Received Network Data In Error. The OEM vehicle electronic control unit (VECU) detected a fault with its accelerator pedal.

EFFECT: Engine can possible ONLY idle or engine will NOT accelerate to full speed.

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) VECU 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 OEM VECU to the Cummins® engine ECM over the SAE J1939 datalink.

Messages sent from the OEM VECU or transmission electronic control unit are received by the Cummins® engine ECM and used for controlling the engine. The Cummins® engine ECM and OEM VECU 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 J1939 datalink wiring and VECU location varies by OEM.

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

Conditions for Setting the Fault Codes:
-The accelerator is depressed and the OEM VECU reads accelerator position as greater than 0 percent, but the secondary throttle position sensor indicates it is in the idle position.
-When the accelerator is released and the OEM VECU reads accelerator position as 0 percent, but the secondary throttle position sensor indicates it is not in the idle position.
-The OEM VECU determines that the accelerator signal wire is shorted high or shorted low.

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 OEM VECU detects an error on the accelerator. The ECM has been set up properly (components enabled and OEM VECU source addressed correctly) to receive multiplexed information for the idle validation switch states and accelerator position over the J1939 datalink from an OEM VECU, and the OEM VECU is transmitting the message for that component.
  • The three types of errors that can occur for this fault are:
-When the accelerator is depressed and the OEM VECU reads accelerator position as greater than 0 percent but the idle validation switch indicates it is in the idle position, this fault status is transmitted to the Cummins® engine ECM on the J1939 datalink, which causes this fault to occur in the Cummins® engine ECM.
-When the accelerator is released and the OEM VECU reads accelerator position as 0 percent, but the idle validation switch indicates it is not in the idle position. This fault status is transmitted to the Cummins® engine ECM on the J1939 datalink, which causes this fault to occur in the Cummins® engine ECM.
-The OEM VECU determines that the accelerator signal line is shorted high or shorted low.

Note: It is still possible to get a Fault Code 285 or 286 if there is an incorrect setup in the OEM VECU or Cummins® engine ECM, for other components, or if the accelerator and idle validation switch, or if the datalink is damaged. The OEM configurations must multiplex the accelerator and idle validation switch inputs together to allow the use of the J1939 multiplexing and limp home feature for these components. INSITE™ electronic service tool can be used to monitor multiplexed components.


Read More:
SPN 639 - FMI 13 (Fault Code 286)
SPN 639 - FMI 9 (Fault Code 285)








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