Dtc 91-Fp (Fuel Pressure Sensor) Low Voltage; Dtc 92-Fp (Fuel Pressure Sensor) High Voltage - Kubota WG1605-E3 Diagnostic Manual

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

DTC 91-FP (Fuel Pressure Sensor) Low Voltage

• Hardware: Liquid Fuel Pressure and Temperature Sensor
• Enabling Conditions: Key ON
• Set Conditions: Fuel pressure feedback voltage lower than 0.100 V for longer than 5 seconds
• Corrective Action(s): Illuminate the MIL and disable adaptive learn fueling correction for the rest of the key-cycle.
• Emissions related fault
• Possible Causes: FP sensor connector disconnected, an open-circuit or short-to-ground of the FP signal circuit
in the wiring harness, a loss of sensor reference voltage, or a failure of the sensor.

DTC 92-FP (Fuel Pressure Sensor) High Voltage

• Hardware: Liquid Fuel Pressure and Temperature Sensor
• Enabling Conditions: Key ON
• Set Conditions: Fuel pressure feedback voltage higher than 4.90 V for longer than 1 second.
• Corrective Action(s): Illuminate MIL and disable adaptive learn fueling correction for the rest of the key-cycle.
• Emissions related fault
• Possible Causes: FP signal circuit or 5 V rtn1 open, open sensor or sensor signal shorted to voltage
The fuel pressure sensor is installed inline in the gasoline fuel supply line and is used to provide fuel pressure
feedback to the ECM. The ECM sets a target rail pressure based on running conditions and then the fuel pump is
PWM controlled through a low side driver in the ECM. The fuel pressure sensor feedback is used to determine when
the actual rail pressure has reached the target rail pressure.
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ECM SYSTEM
KiSC issued 12, 2016 A