VOLVO
ECM-1805 - Fuel temperature sensor. Signal too low
System
Engine Control Module (ECM)
Volvo models this fault code applies to
Applies to the following models:
2 modelsS40 (1996–2004), V40 (1996–2004)
Show models by year and engine (2)
What does this fault code mean?
The ECM monitors the signal wire from the fuel temperature sensor. If the signal is too low, because of a fault in the wire or in the sensor, fault code ECM-1805 is set.
Possible causes
- Signal wire short-circuited to ground
- Defective fuel temperature sensor
What you can do
- 1Switch off the ignition and check the fuel temperature sensor connector for play, contact resistance and oxidation
- 2With a multimeter, check that the sensor's signal wire is not shorted to ground
- 3If you have a diagnostic tool: read the fuel temperature in live data and check whether the value looks reasonable
- 4If the fault remains, have a workshop check the wiring or replace the fuel temperature sensor
Symptoms you may notice1
- No noticeable symptoms for the driver
What the fault can affect1
- The control module uses a fixed value for fuel temperature
General guidance for car owners. Diagnosis on the car can point to a different cause.