Cummins ISB6.7 CM2350 (2013-17) Fault Code: 3494 PID: SPN: 1081 FMI: 7 Engine Wait to Start Lamp- Mechanical System Not Responding or Out of Adjustment
Cummins ISB6.7 CM2350 (2013-17) Fault Code: 3494 PID: SPN: 1081 FMI: 7 Engine Wait to Start Lamp- Mechanical System Not Responding or Out of Adjustment
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.
Messages sent from OEM VECUs or transmission ECUs are received by the Cummins? ECM and used for controlling the engine. The Cummins? ECM and OEM VECU(s) must be configured properly, so that proper operation of the multiplexed components will occur.
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 at initial key ON when the intake air heater is commanded ON.
Conditions for Setting the Fault Codes
The Engine Control Module (ECM) detected a malfunction of the Wait to Start Lamp
Action Taken When the Fault Code is Active
The ECM illuminates the red STOP ENGINE lamp immediately after the diagnostic runs and fails.
Conditions for Clearing the Fault Code
1)To validate the repair, perform a key cycle, and leave the key in the ON position 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.
4)For On-Board Diagnostics (OBD) engines, the ECM will extinguish the Malfunction Indicator Lamp (MIL) after three consecutive trips where the diagnostic runs and passes.
5)The Reset All Faults command in INSITE? electronic service tool can be used to clear active and inactive faults, as well as extinguish the MIL for OBD applications.
Shop Talk
A malfunctioning Wait to Start Lamp
Possible Causes:
1) A short circuit to ground
2) An open circuit in the OEM harness
3) A malfunctioning engine control module (ECM)
