VOLVO
ECM-644A - Reset valve, camshaft. Slow regulation/Faulty signal. Intermittent fault
System
Motorstyring (ECM)
Volvo-modeller feilkoden gjelder for
Feilkoden har ulik betydning avhengig av modell, årsmodell eller motor. Velg betydningen som gjelder din bil.
Gjelder følgende modeller:
5 modellerC70 Cabriolet (1998–2005), C70 Coupé (1998–2002), S70 (1997–2000), V70 (1997–2000), V70 XC (1998–2000)
Vis modeller per årsmodell og motor (10)
- Volvo C70 Cabriolet (1998–2005)1999, 2001–2002
- Volvo C70 Cabriolet (1998–2005)2000Alle motorer unntatt: B5244S
- Volvo C70 Coupé (1998–2002)1999Alle motorer unntatt: B5254S DENSO
- Volvo C70 Coupé (1998–2002)2000Alle motorer unntatt: B5244S
- Volvo C70 Coupé (1998–2002)2001–2002
- Volvo S70 (1997–2000)1999Kun motor: B5204T3, B5204T4, B5234T3, B5234T7, B5254T
- Volvo S70 (1997–2000)2000Kun motor: B5204T3, B5204T4, B5234T3, B5234T7, B5244T
- Volvo V70 (1997–2000)1999Kun motor: B5204T3, B5204T4, B5234T3, B5234T7, B5234T8, B5254T
- Volvo V70 (1997–2000)2000Alle motorer unntatt: B5244S, B5244S2, B5244SG, B5244SG2, D5252T MSA 15.8
- Volvo V70 XC (1998–2000)1999–2000
Hva betyr feilkoden?
The reset valve for the camshaft is regulating too slowly or giving a faulty signal. The fault is intermittent, meaning it comes and goes, so it may be gone when you check. The variable camshaft is switched off while the fault is present, which can show up as poorer performance.
Mulige årsaker
- The timing belt has jumped over the teeth
- Defective reset valve
- Mechanical fault in the VVT unit
- Defective camshaft position sensor
- Low oil pressure
- Poor oil quality
Hva du kan gjøre
- 1Check the engine oil level and quality, and look for contamination
- 2Use a multimeter to check that the wiring to the camshaft sensor and reset valve has no open circuit or short to ground or supply voltage
- 3Have a workshop clean the reset valve and check the oil passages in the cylinder head. Replace the valve if it is contaminated
- 4With a diagnostic tool, compare the actual camshaft position with the target at idle, but only once the engine speed has stabilised
- 5If the fault remains after this, the VVT unit may be damaged, which a workshop needs to assess
Symptomer du kan merke1
- Poorer performance
Hva feilen kan påvirke1
- The variable camshaft is switched off
Generell veiledning for bileiere. Feilsøking på bilen kan peke på en annen årsak.