Dtc 1174-Epr/Cfv Voltage Supply High; Dtc 1175-Epr/Cfv Voltage Supply Low; Dtc 1176-Epr/Cfv Internal Actuator Fault Detection; Dtc 1177-Epr/Cfv Internal Circuitry Fault Detection - Kubota WG1605-E3 Diagnostic Manual

WG1605-G-E3,WG1605-L-E3,WG1605-GL-E3, DM

DTC 1174-EPR/CFV Voltage Supply High

• Hardware: EPR (HD EPR) or CFV
• Enabling Conditions: Engine Running
• Set Conditions: Voltage supply to EPR is higher than 33.0 VDC for longer than 5 seconds.
• Corrective Action(s): Illuminate MIL, AL disable, AL disable in key-cycle, power derate 2, Low rev limit
• Emissions related fault
• Possible Causes: Wiring harness open,short or damage

DTC 1175-EPR/CFV Voltage Supply Low

• Hardware: EPR (HD EPR) or CFV
• Enabling Conditions: Engine Running
• Set Conditions: Voltage supply to EPR is lower than 18.0 VDC for longer than 5 seconds.
• Corrective Action(s): Illuminate MIL, AL disable, AL disable in key-cycle, power derate 2, Low rev limit
• Emissions related fault
• Possible Causes: Wiring harness open,short or damage, Faulty EPR power circuit

DTC 1176-EPR/CFV Internal Actuator Fault Detection

• Hardware: EPR (HD EPR) or CFV
• Enabling Conditions: Engine Running
• Set Conditions: Internal Actuator Fault detected
• Corrective Action(s): Illuminate MIL, AL disable
• Emissions related fault
• Possible Causes: Short or open circuit in actuator coil, Associated wiring, Overheating of actuator drive
electronics
If the EPR/CFV does not trigger either 1171, 1172, or either of the CFV Flow fault code(s), there is no issue with
the EPR/CFV. If one or more of these faults are triggered, refer to the appropriate section for diagnostic information.

DTC 1177-EPR/CFV Internal Circuitry Fault Detection

• Hardware: EPR (HD EPR) or CFV
• Enabling Conditions: Engine Running
• Set Conditions: Internal circuitry fault detected
• Corrective Action(s): Illuminate MIL, AL disable
• Emissions related fault
• Possible Causes: DEPR internal microprocessor or memory failure, fuel temperature sensor failure
If the EPR/CFV does not trigger either 1171, 1172, or either of the CFV Flow fault code(s), there is no issue with
the EPR/CFV. If one or more of these faults are triggered, refer to the appropriate section for diagnostic information.
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ECM SYSTEM
KiSC issued 12, 2016 A