VOLVO
DEM-P188974 - Oil Pressure Pump Performance. Mechanical Failures. Actuator slipping
System
Firehjulsdrift (DEM)
Volvo-modeller feilkoden gjelder for
Gjelder følgende modeller:
4 modellerS80 (2007–), V70 (2008–), XC70 (2008–), XC90 (2003–)
Vis modeller per årsmodell og motor (6)
Hva betyr feilkoden?
The four-wheel drive control module (DEM) measures the oil pressure in the Haldex clutch (AOC) through a pressure sensor. When engine speed rises, an electric feed pump should build a base pressure in the clutch. If that pressure is not reached in time, the code is set and the four-wheel drive can be disengaged. The cause may be the sensor, the pump, too little oil in the clutch or an internal leak.
Mulige årsaker
- Pressure sensor not functioning
- Damaged feed pump
- Too little oil in the clutch
- Internal leak in the clutch
Hva du kan gjøre
- 1Read off the fault code and note whether it is permanent or has gone. If it has gone, no action is needed
- 2Look for oil leaks at the clutch and the rear axle
- 3Check the connector to the control module and the wiring to the feed pump for oxidation, loose connections and damage
- 4If you have a diagnostic tool, read the oil pressure in live data as engine speed rises and check that the pressure climbs promptly
- 5Listen for unusual noises from the clutch and the rear axle during a test drive
- 6If the fault remains, have a workshop check the clutch (AOC) and replace the feed pump or pressure sensor as needed
Symptomer du kan merke1
- Four-wheel drive does not work
Hva feilen kan påvirke1
- Four-wheel drive is disengaged
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