ECM SYSTEM
WG1605-G-E3,WG1605-L-E3,WG1605-GL-E3, DM
1-170
DTC 183-Fuel Temp (Gasoline) High Voltage/High Temp
• Hardware: Liquid Fuel Temperature Sensor
• Enabling Conditions: Engine Running
• Set Conditions: FT sensor voltage higher than 4.90 V OR indicated temperature above 59 °C (138 °F) for longer
than 2 minutes
• Corrective Action(s): Illuminate MIL and disable fuel adaptive learn for the rest of the key cycle
• Emissions related fault
• Possible Causes:
– Voltage High: Sensor signal wire shorted to voltage, sensor open, signal circuit open or faulty ECM
– Temperature High: Operating in a hot environment, Sensor out of calibration, unwanted resistance in signal
circuit causing circuit to indicate a very hot temp (above 59 °C (138 °F)) but voltage not low enough to set a
low voltage fault
The Fuel Temperature sensor is a thermistor (temperature sensitive resistor) integrated into the fuel pressure
located in the fuel supply line between the fuel pump and the fuel rail. It is used to monitor the fuel temperature exiting
the fuel pump to set a fault if the fuel temperature is too high resulting in increased fuel vapor from the fuel tank
causing excessive evaporative emissions. The ECM provides a voltage divider circuit so that when the fuel is cool,
the signal reads higher voltage, and lower when warm.
This fault will set if the signal voltage is higher than 4.90 V anytime that the engine is running OR the indicated
temperature from the sensor is above 59 °C (138 °F) for longer than 1 second.
DTC 187-BP FT Gaseous Fuel Extremely Low
• Hardware: Gaseous Fuel Temperature Sensor (built-in DEPR)
• Enabling Conditions: Engine Running
• Set Conditions: Fuel temperature is lower than (40 °F) for longer than 1 sec.
• Corrective Action(s): Illuminate MIL
• NO emissions related fault
• Possible Causes: Not vaporized completely
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