VOLVO
EFI-0021 - Engine coolant temperature (ECT) sensor. Faulty signal
System
Elektronisk drivstoffinnsprøytning (EFI)
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Gjelder følgende modeller:
2 modellerS40 (1996–2004), V40 (1996–2004)
Vis modeller per årsmodell og motor (2)
Hva betyr feilkoden?
The engine coolant temperature sensor sends the engine control module a signal about the coolant temperature. If that signal is faulty, the code is set. The fault may be a defective sensor, a short-circuit or open circuit in the signal wire, or contact resistance in the connectors.
Mulige årsaker
- Defective engine coolant temperature (ECT) sensor
- Signal wire short-circuited to ground or supply voltage
- Open circuit in the signal wire
- Contact resistance
Hva du kan gjøre
- 1Warm the engine up at idle until it is hot. With a diagnostic tool you can read the engine temperature in live data.
- 2Check the connectors to the coolant temperature sensor and the control module for contact resistance and oxidation, and remedy them.
- 3Check that the sensor is not damaged. Look for chafed wires or loose connectors, and see whether the fault appears when the wiring is moved.
- 4If no fault is found, the sensor needs replacing. Have a workshop do this.
Symptomer du kan merke3
- The malfunction indicator lamp lights up
- The electric cooling fan keeps running after the engine is switched off
- Poor performance
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