VOLVO
ECM-3522 - Misfire, emission. Faulty signal. Permanent fault
System
Engine Control Module (ECM)
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:
5 modelsC70 Cabriolet (1998–2005), C70 Coupé (1998–2002), S70 (1997–2000), V70 (1997–2000), V70 XC (1998–2000)
Show models by year and engine (5)
What does this fault code mean?
This code concerns cylinder 2. The fault is stored as permanent, meaning it is present right now, and the misfire affects exhaust emissions.
Possible causes
- Defective spark plug
- Moisture in the spark plug well
- Repeated cold starts without the engine reaching operating temperature between starts
- Contaminated or incorrect fuel
- Faulty fuel pressure
- Blocked or leaking injector
What you can do
- 1Check that there is fuel in the tank and that the engine oil level is correct
- 2If you have a diagnostic tool: read the misfire counter for cylinder 2 and compare it with the others
- 3Check that the crankcase ventilation is not blocked and that the intake does not leak air
- 4Stored camshaft control codes should be diagnosed first
- 5Have a workshop check the spark and measure fuel pressure and compression with diagnostic equipment
Symptoms you may notice5
- The engine misfires
- Hard starting
- Deterioration in performance
- Uneven idle
- Several cylinders are not firing
What the fault can affect3
- Catalytic converter diagnosis is switched off
- Leakage diagnosis is switched off
- Rear oxygen sensor control is switched off
General guidance for car owners. Diagnosis on the car can point to a different cause.