SPN 974 - FMI 2/19 (Fault Code 288)
SPN 974 - FMI 2/19 (Fault Code: 288)
SPN974 FMI2
SPN974 FMI19
CODES:
Fault Code: 288
PID(P), SID(S): P372
SPN: 974
FMI: 2/19
Lamp: RED
SRT:
REASON: SAE J1939 Multiplexing Remote Accelerator Pedal or Lever Position Sensor System - Received Network Data In Error. The OEM vehicle electronic control unit (VECU) detected a fault with the remote accelerator.
EFFECT: The engine will NOT respond to the remote throttle. Engine may ONLY idle. The primary or cab accelerator may be able to be used.
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 OEM 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 datalink.
SPN974 FMI2
SPN974 FMI19
 |
| SB, ISC and ISL with CM2150 - SAE J1939 Multiplexing Remote Accelerator Pedal or Lever |
CODES:
Fault Code: 288
PID(P), SID(S): P372
SPN: 974
FMI: 2/19
Lamp: RED
SRT:
REASON: SAE J1939 Multiplexing Remote Accelerator Pedal or Lever Position Sensor System - Received Network Data In Error. The OEM vehicle electronic control unit (VECU) detected a fault with the remote accelerator.
EFFECT: The engine will NOT respond to the remote throttle. Engine may ONLY idle. The primary or cab accelerator may be able to be used.
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 OEM 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 datalink.
Messages sent from the OEM VECU or transmission ECU 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 OEM VECU determines that the remote throttle signal wire is shorted high or shorted low. 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 remote throttle enable switch has a shorted high or shorted low error detected by the OEM VECU. This fault status is transmitted to the ECM on the J1939 datalink, which causes this fault to occur in the ECM.
Action Taken When the Fault Code is Active:
• The ECM illuminates the red STOP 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 red STOP 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 remote throttle and or remote throttle enable switch. The ECM has been set up properly (components enabled and OEM VECU source addressed correctly) to receive multiplexed information for the remote throttle enable switch states and remote accelerator position over the J1939 datalink from an OEM VECU, and the OEM VECU is transmitting the message for that component. Most OEM VECUs will not have the circuitry to detect a remote throttle switch error.
The two types of errors that can occur for this fault are:
• The OEM VECU determines that the remote throttle signal line is shorted high or shorted low. 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 remote throttle enable switch has a shorted high or shorted low error detected by the OEM VECU, this fault status is transmitted to the ECM on the J1939 datalink, which causes this fault to occur in the ECM. Most OEM VECUs will not incorporate fault detection on a switch.
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 remote throttle and remote throttle switch, or the datalink is damaged. The OEM configurations must multiplex the remote throttle and remote throttle switch inputs together to allow the use of the J1939 multiplexing 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 91 - FMI 2 / 19 (Fault Code 287)
Blog.Teknisi
-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 OEM VECU determines that the remote throttle signal wire is shorted high or shorted low. 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 remote throttle enable switch has a shorted high or shorted low error detected by the OEM VECU. This fault status is transmitted to the ECM on the J1939 datalink, which causes this fault to occur in the ECM.
Action Taken When the Fault Code is Active:
• The ECM illuminates the red STOP 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 red STOP 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 remote throttle and or remote throttle enable switch. The ECM has been set up properly (components enabled and OEM VECU source addressed correctly) to receive multiplexed information for the remote throttle enable switch states and remote accelerator position over the J1939 datalink from an OEM VECU, and the OEM VECU is transmitting the message for that component. Most OEM VECUs will not have the circuitry to detect a remote throttle switch error.
The two types of errors that can occur for this fault are:
• The OEM VECU determines that the remote throttle signal line is shorted high or shorted low. 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 remote throttle enable switch has a shorted high or shorted low error detected by the OEM VECU, this fault status is transmitted to the ECM on the J1939 datalink, which causes this fault to occur in the ECM. Most OEM VECUs will not incorporate fault detection on a switch.
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 remote throttle and remote throttle switch, or the datalink is damaged. The OEM configurations must multiplex the remote throttle and remote throttle switch inputs together to allow the use of the J1939 multiplexing 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 91 - FMI 2 / 19 (Fault Code 287)
Blog.Teknisi
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