VOLVO
EFI-0022 - Engine speed (RPM) sensor
System
Electronic Fuel Injection (EFI)
Volvo models this fault code applies to
This fault code has different meanings depending on model, model year or engine. Select the meaning that applies to your car.
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 engine speed sensor sends a pulsed signal to the control module as the engine turns. The code is set when the sensor's output voltage stops varying for a set time, so the control module receives no pulsed signal. The fault may be a defective sensor, a short-circuit or open circuit in the signal wire, or contact resistance, and the engine may not start.
Possible causes
- Defective engine speed (RPM) sensor
- Signal wire short-circuited to ground or supply voltage
- Open circuit in the signal wire
- Contact resistance
What you can do
- 1Check the connectors to the sensor and the control module for contact resistance and oxidation, and remedy whatever you find.
- 2With a diagnostic tool, crank the engine and watch the engine speed in live data. If it does not change at all during cranking, the signal is missing.
- 3With a multimeter, check that the signal wire from the sensor is not broken or short-circuited to ground or voltage.
- 4If no fault is found in the wiring, the sensor needs replacing. Have a workshop do the replacement.
Symptoms you may notice2
- The malfunction indicator lamp lights up
- The engine does not start
What the fault can affect1
- The control module works from the conditions recorded before the code was set
General guidance for car owners. Diagnosis on the car can point to a different cause.