VOLVO
ECM-0008 - Fuel temperature sensor. Signal too low. Intermittent fault.
System
Engine Control Module (ECM)
Volvo models this fault code applies to
Applies to the following models:
4 modelsS70 (1997–2000), S80 (1999–2006), V70 (1997–2000), V70 (2000–2008)
What does this fault code mean?
The engine control module receives too low a signal from the fuel temperature sensor. The fault is intermittent, meaning it comes and goes, and may not be present right now. The sensor measures the temperature of the fuel, and while the fault is active the electric cooling fan may run at the wrong speed.
Possible causes
- Contact resistance in the connections
- The signal wire is shorted to earth
- Break in the signal or earth wire
- Faulty fuel temperature sensor
What you can do
- 1Check the wires and connectors to the fuel temperature sensor for contact resistance, chafing and corrosion
- 2With a diagnostic tool, read the fuel temperature in live data. It should be plausible and not stay fixed at one value
- 3Measure with a multimeter that the signal wire to the sensor is not shorted to earth and that the wires have no break
- 4Clear the fault code and road test the car. If it returns, have a workshop repair or replace the fuel temperature sensor
- 5Note whether the cooling fan only runs at the wrong speed at certain times, so the workshop can reproduce the fault
Symptoms you may notice1
- The electric cooling fan runs at half speed with the ignition on and the engine running
General guidance for car owners. Diagnosis on the car can point to a different cause.