AWD System - Binding/Noise On Turns

Retailer Technical Journal 19571

MY 2009 AWD AOC (DEM), binding and noise while turning

Date: 10-08-2008

Reference: VIDA

Note!
If using a printed copy of this Retailer Technical Journal, first check for the latest online version.

DESCRIPTION:





Due to a sticking pressure modulator in the AOC (Active On Demand Coupling), there may be a binding feeling or a noise while making tight turns in an All Wheel Drive (AWD) vehicle listed in the chart. This symptom generally occurs at low mileage and generally, no diagnostic trouble codes (DTCs) are set.

SERVICE:





Replace the Differential Electronic Module (DEM) and download a DEM reload per VIDA. A replacement DEM comes with a replacement pressure modulator. It is important to note the orientation of the pressure modulator when installing the new DEM. Incorrectly installing the pressure modulator can damage the connector terminals on the pressure modulator and on the DEM. This can cause an interruption in All Wheel Drive (AWD) and lead the technician to chase falsely-set DTCs. The photos show common results of an incorrectly installed pressure modulator.





NOTE:
To avoid confusion and incorrectly replaced components, it must be noted that the HALDEX AWD system in the MY 2009 S80, V70, XC70, and XC90 is different compared to MY 2008 and components are not interchangeable. Also note, the temperature/pressure sensor on the MY 2008 S80, V70, XC70, and XC90 DOES NOT EXIST AND IS NOT USED on MY 2009 S80, V70, XC70, and XC90 even though the female connector is still in the DEM.





WARRANTY CLAIM INFORMATION