CM850 Electronic Control System – FAULT CODE 2293

Fuel Inlet Meter Device Flow Demand Lower Than Expected – Data Valid but Below Normal Operational Range – Moderately Severe Level


Fault Code: 2293
FMI: 18
LAMP: Amber

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.

None or possible engine noise associated with higher injection pressures
(especially at idle or light load). Engine power is derated.

Fuel System

Circuit Description

The electronic control module (ECM) monitors engine-operating conditions, including the reading of rail fuel pressure, and changes the flow command to either increase (OPEN the electronic fuel control actuator) or decrease
(CLOSE the electronic fuel control actuator) the fuel supply to the high-pressure pump.

Component Location

The electronic fuel control actuator is installed on the high-pressure fuel pump. Refer to Procedure 100-002 for a detailed component location view.

Shop Talk

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.

Refer to Troubleshooting Fault Code t05-2293

Last Modified:  08-Jul-2010