P0181
DTC P0181 Fuel Temperature (FT) Sensor PerformanceCircuit Description
The fuel temperature (FT) sensor is installed to the fuel supply pump. The FT sensor is a variable resistor and it measures the temperature of the fuel entering the fuel supply pump. If the ECM detects that the difference of fuel temperature is smaller than the calculated range during the predetermined conditions this DTC will set.
Condition for Running the DTC
^ DTCs P0016 P0116 P0117 P0118 P0182 P0183 P0201 - P0204 P0234 P0261 P0264 P0267 P0270 P0299 P0300 P0301 - P0304 P0335 P0336 P0500 P0602 P0642 P0643 P0652 P0653 P2146 - P2151 P1293 and P268A are not set.
^ The battery voltage is between 10 to 16 volts.
^ The ignition switch is ON.
^ The engine runtime is between 100 to 840 seconds.
^ The startup engine coolant temperature is between 19 to 140°F (-7 to 60°C) and current temperature is more than 140°F (60°C).
^ The accumulated vehicle runtime is longer than 480 seconds with the vehicle speed is more than 16 MPH (25 km/h).
^ The accumulated fuel injection quantity since engine start is more than a threshold.
Condition for Setting the DTC
^ The ECM detects that the difference of maximum and minimum fuel temperature is less than 1.8°F (1°C).
Action Taken When the DTC Sets
^ The ECM illuminates the MIL when the diagnostic runs and fails. Refer to DTC Type Definitions for Action Taken When the DTC Sets - Type A.
^ The ECM limits fuel injection quantity.
^ The ECM inhibits EGR control
^ The ECM inhibits DPF regeneration control.
^ The ECM inhibits cruise control.
Condition for Clearing the DTC
^ Refer to DTC Type Definitions for Condition for Clearing the MIL/DTC - Type A.
Diagnostic Aids
^ Before starting a cold engine Fuel Temperature and Engine Coolant Temperature should be relatively close to each other.
^ Use the Temperature vs. Resistance table to test the FT sensor at various temperature levels to evaluate the possibility of a skewed sensor. A skewed sensor could result in poor driveability concerns.
Circuit/System Testing DTC P0181
