Cummins ISX11.9 CM2250 (2010-12) Fault Code: 2468 PID: 190 SPN: 102 FMI: 3 Engine Crankshaft Speed/Position – Data Valid But Above Normal Operating Range- Moderately Severe Level

Circuit Description
The air shutoff valve is either an original equipment manufacturer (OEM) or Cummins installed component that shuts off the flow of air into the intake of the engine in order to prevent an engine overspeed condition. When activated, the engine control module (ECM) supplies 12-VDC to the air shutoff solenoid. This solenoid then activates the valve, closing a plate over the intake.

Component Location
The air shutoff valve is either an OEM or Cummins? installed component, and is usually located on the air intake connection.

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

Conditions for Setting the Fault Codes
The ECM has detected that engine speed was greater than 2500 rpm for 0.25 seconds, or the operator manually tripped the engine air shutoff valve.

Action Taken When the Fault Code is Active
The ECM illuminates the amber CHECK ENGINE lamps immediately when the diagnostic runs and fails
The air shutoff valve closes
Engine fueling is set to zero
The engine starter will be locked out.
Conditions for Clearing the Fault Code
To validate the repair, the air shutoff valve must be manually reset to the open position. Then start the engine and let it idle for 1 minute.
The fault code status displayed by INSITE? electronic service tool will change to INACTIVE immediately after the diagnostic runs and passes.
The ECM will turn off the amber CHECK ENGINE lamp after the diagnostic runs and passes.
The ?Reset All Faults? command in INSITE? electronic service tool can be used to clear active and inactive faults.

Shop Talk
This fault code indicates that the engine has been shut down via the engine air shutoff valve. This can occur automatically (engine overspeed condition) or manually (activating the engine air shutoff valve switch in the cab). In either case, this fault code will become active until the valve is de-activated.

Possible Cause:
1) Engine Damaged
2) ECM failure