P0183 - Fuel Temperature Sensor 'A' Circuit High
The ECM can monitor the fuel temperature as part of the fuel / emissions control and also on some systems to determine whether additional fuel cooling (prevents vapour locks) or fuel heating (prevents diesel waxing) is required.
Fault Code Explained
The ECM has detected that the sensor output is either above its maximum operating parameter or is higher than expected for the current operating conditions.
Recommended TestsIf possible use a diagnostic computer to compare live data readings for the fuel temperature sensor and compare to actual fuel temperature to establish if the sensor reading is correct
If the sensor reading is correct and the fuel temperature is too high:
- Check operation of fuel heater if fitted
- Check operation of fuel cooler if fitted
If the sensor reading is incorrect:
- Test sensor output at sensor and ECM
- Test sensor supply Voltage
- Test sensor Earth