Cummins ISB6.7 CM2350 (2013-17) Fault Code: 4252 PID: SPN: 1081 FMI: 31 Engine Wait to Start Lamp – Condition Exists. The received signal does not match the commanded signal.

Cummins ISB6.7 CM2350 (2013-17) Fault Code: 4252 PID: SPN: 1081 FMI: 31 Engine Wait to Start Lamp – Condition Exists. The received signal does not match the commanded signal.

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 the received status of the Engine Wait to Start Lamp did not match the commanded status.

Action Taken When the Fault Code is Active
The ECM illuminates the amber CHECK ENGINE lamp and/or the Malfunction Indicator Lamp (MIL) immediately when 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.

Possible Causes:
1)The SAE J1939 Datalink controller has indicated a malfunction of the Engine Wait to Start Lamp.