Cummins ISB CM850 (2003-06) Fault Code: 2293 PID: SPN: FMI: 18 Fuel inlet meter device flow demand lower than expected – data valid but below normal operational range – moderately severe level. The flow demand is lower than expected.

Fault Code 2293 is activated when the electronic fuel control actuator is closed more than expected to lower rail fuel pressure.

An electric fuel control actuator with excessive leakage can possibly result in high rail fuel pressures at idle or light load. A restriction in the fuel-drain-to-tank return line can prevent unneeded fuel from exiting the high-pressure fuel pump. This excess drain fuel can enter the pumping chamber and pressurize the rail. Check the fuel drain line restriction. High resistance or an open circuit in the electric fuel control actuator can cause this fault to log. Air in the fuel can result in pressure changes that would cause this fault to log. High lift pump delivery pressure could cause this fault to log, as could tampering with the rail fuel pressure sensor.

Once the repair has been made, this fault code will require approximately 15 to 20 minutes of road test or dynamometer run to be set inactive.

Possible repairs:

1)Replace the sensor or repair the engine harness.
2)Replace the electric fuel lift pump.
3)Replace the electronic fuel control actuator.
4)Repair or replace the fuel return drain line.