ECM SYSTEM
WG1605-G-E3,WG1605-L-E3,WG1605-GL-E3, DM
1-215
(21) EPR (HD EPR) or CFV (DTC 1171 to 1177)
DTC 1171-EPR/CFV Regulation Pressure Higher than Expected
• Hardware: EPR (HD EPR) or CFV
• Enabling Conditions: Engine Running
• Set Conditions: EPR (actual-commanded) pressure is higher than 2.5 in H
2O for longer than 5 seconds
• Corrective Action(s): Illuminate MIL, AL disable
• Emissions related fault
• Possible Causes: Inlet pressure to DEPR is too high
This fault indicates that the device is at its minimum limit of authority and the pressure command cannot be
achieved likely due to delivery/supply pressure being higher than expected. Adaptive fueling correction is disabled
to avoid improper learning of the fuel correction table due to improper fuel supply pressure, and a Power Derate
1 condition is activated to reduce the possibility of engine damage.
The EPR is the second generation of EControls’ Electronic Pressure Regulator found in many industrial and
heavy-duty applications. The 2nd generation EPR is a “smart” actuator integrated with the primary stage regulator
designed to control gaseous fuel pressure in the secondary stage regulator. The EPR receives fuel pressure
commands from the ECM and quickly and precisely modulates fuel pressure to the gaseous fuel mixer. The EPR
allows for fast and accurate gaseous fuel control to provide a combustible mixture to the engine.
The third generation of EControls’ Electronic Pressure Regulator is the DEPR. The DEPR is a “smart” actuator
that is fed supply pressure through a DSR (Dual Stage Regulator). The DSR is fully mechanical. The DEPR receives
fuel pressure commands from the ECM and quickly and precisely modulates fuel pressure to the gaseous fuel mixer.
The DEPR allows for very fast and very accurate gaseous fuel control to provide a combustible mixture to the engine.
The fourth generation of EControls’ gaseous fuel control valve is the CFV. The CFV contains both a high-pressure
Electronic Pressure Regulator and a precision Continuous Flow Valve. The inlet pressure to the CFV is typically 85
psig (586 kPa). The CFV receives mass flow commands from the ECM and quickly and precisely modulates both the
fuel pressure and metering valve to achieve the desired mass flow. The CFV allows for very fast and very accurate
gaseous fuel control to provide a combustible mixture to the engine.
DTC 1172-EPR/CFV Regulation Pressure Lower than Expected
• Hardware: EPR (HD EPR) or CFV
• Enabling Conditions: Engine Running
• Set Conditions: EPR (actual-commanded) pressure is lower than -2.5 in H
2O for longer than 5 seconds
• Corrective Action(s): Illuminate MIL, AL disable
• Emissions related fault
• Possible Causes: Inlet pressure to DEPR is too low
Malfunctioning lock off valve, plugged fuel filter, closed manual valve or fuel tank out of fuel
This fault indicates that the device is at its minimum limit of authority and the pressure command cannot be
achieved likely due to delivery/supply pressure being higher than expected. Adaptive fueling correction is disabled
to avoid improper learning of the fuel correction table due to improper fuel supply pressure, and a Power Derate
1 condition is activated to reduce the possibility of engine damage.
DTC 1173-EPR/CFV Comm Lost
• Hardware: EPR (HD EPR) or CFV
• Enabling Conditions: Engine Running
• Set Conditions: No EPR/CFV packets received within 500 ms
• Corrective Action(s): Illuminate MIL, AL disable, AL disable in key-cycle, power derate 2, Low rev limit
• Emissions related fault
• Possible Causes: Faulty CAN connection, CAN termination incorrect
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