PACCAR PX-9 CM2350 (2013-17) Fault Code:3555 PID: SPN:1081 FMI:9 Engine Wait to Start Lamp – Abnormal Update Rate

Reason:
Engine Wait to Start Lamp – Abnormal update rate. A loss of communication has been detected.

Effect:
None on performance

Circuit Description:
Normally, switches, accelerators, and other components are connected to the engine 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® ECM over the SAE J1939 data link.

Component Location:
The SAE J1939 data link wiring and the SAE J1939 devices vary by OEM options.

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

Conditions for Setting the Fault Codes:
The Engine Control Module (ECM) detected a loss of communication with the Engine Wait to Start Lamp

Action Taken When the Fault Code is Active:
The ECM illuminates the amber CHECK ENGINE lamp immediately when the diagnostic runs and fails.

Conditions for Clearing the Fault Code:
1) To validate the repair, perform a key cycle, start the engine and let it idle for 1 minute.
2) The fault code status displayed by INSITE™ electronic service tool will change to INACTIVE immediately after the diagnostic runs and passes.
3) The ECM will turn off the amber CHECK ENGINE lamp immediately after the diagnostic runs and passes.

Shop Talk:
N/A

Possible Causes:
1) Incorrect terminating resistance of the SAE J1939 datalink circuit
2) Incorrect feature and parameter settings
3) A malfunctioning SAE J1939 datalink circuit