Drivetrain - Multiple DEM DTC's Set
NO: 46-11DATE: 5-15-2008
MODEL/YEAR:
AWD 2006-2007 S60 / V70 / XC70 / XC90
AWD 2006 S80
SUBJECT:
DEM DTC's (Differential Electronic Module Diagnostic Trouble Codes)
REFERENCE: VIDA
Note!
If using a printed version of this TNN, first check for the latest online version. This TNN supersedes the previous version of TNN 46-11 dated 4-16-08. Changes have been made to the fault tracing information. Please update your files.
Description:
The following DEM DTC's could be caused by a faulty Temperature/Pressure
sensor in the AOC (Active On-Demand Coupling) on the vehicles listed above:
P093211, P093215, P093711, P093715, P093827, P096162, P188973, P188974, P188A68, 0001, 0002, 0007, 000B, 000B
Service:
Check if the Temperature/Pressure sensor indicates a malfunction by using the procedure described below.
The following test can be performed using VIDA/Diagnostics/Vehicle Communications to indicate if a malfunction can be detected with the Temperature/Pressure sensor function. To test the function, DTC information and freeze frames have to be saved before DTC's are erased and then the DTC's can be erased. If the DTC's are not erased, the AOC functionality will be limited.
Testing for pressure sensor function:
1. Ignition in position II, engine not running. Read out pressure to confirm function. Correct pressure 0.00 +/- 0.08 MPa (0.00 +/- 11.60 PSI).
2. Engine idling. Check that the AOC oil pump is running. Read out pressure info to confirm function. Correct pressure 0.38 +/- 0.08 MPa (55.11 PSI +/- 11.60 PSI)
Testing for temperature sensor function:
1. Ignition in position II. Read out temperature information. Normal value is ambient temperature when the vehicle is cold and 20°- 50°C (36°- 90°F) more than ambient temperature when the vehicle is driven.
If the Temperature/Pressure sensor indicates a malfunction when checked as described above, replace the sensor according to the Removal, Replacement, and Installation procedure in VIDA, erase DTC's, recheck the pressure & temperature using VIDA/Diagnostics/Vehicle Communications, and then test drive the vehicle.
There are two different Temperature/Pressure sensors available; an 80 bar sensor and a 40 bar sensor. The color of the sensor cannot be trusted to distinguish between the two sensors. As a guideline, chassis numbers that are found in VIDA parts catalog (once updated) can be used to distinguish between the two sensors as long as the AOC or DEM has never been replaced previously in the vehicle.
If a 40 bar AOC or DEM has been replaced the vehicle now has an 80 bar sensor. If it has been replaced, the diagnostic hardware (HW) part number (P/N) must be read off in VIDA/Diagnostics/Network to distinguish between the two sensors.
If a 40 bar sensor is installed where it should be an 80 bar sensor, the sensor will indicate too high of a pressure. If an 80 bar sensor is installed where it should be a 40 bar sensor, the sensor will indicate too low of a pressure. To be absolutely sure that the correct pressure sensor is installed in the vehicle, use VIDA to read off the HW P/N.
If the vehicle is set up for an 80 bar sensor P/N 30759668, one of the following DEM HW P/N's should be read out: 30759701, 30785483, 30759682, 30783198, 30735844, or 30783018.
If none of the above DEM HW P/N's show up, the vehicle is set up for a 40 bar sensor P/N 30651694.
Care should be taken when removing the connectors from the DEM. Very little force is required to separate the connectors from the DEM without breaking the connector. When releasing the connector, press down on the connector, towards the DEM, to relieve pressure on the connector tab. Insert a small flat-blade screwdriver under the connector tab and gently rotate the screwdriver until the tab is unlocked. See photo. Then, gently push up on the connector. See photo.
It is important to note the orientation of the Temperature/Pressure sensor in the DEM upon replacement. It is possible to forcefully install the sensor to the DEM in the incorrect orientation. Incorrectly installing the sensor will inhibit AWD function and can damage the DEM. See the photos of the approximate dimensions of the sensor connector and the female terminals in the DEM.
See the photo of a sample DEM that had an incorrectly installed
Temperature/Pressure sensor. The center two female terminals are now spread apart due to the incorrect installation and the sensor will not make constant electrical contact with the DEM.
The photo's show the correct and incorrect orientation of the
Temperature/Pressure sensor in the DEM connector.
The fault tracing and parts catalog information in VIDA are currently being updated to include this information.
WARRANTY CLAIM INFORMATION