Emergency default mode, function - GF27.60-P-3012AHX

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TRANSMISSION 722.930 up to 5/31/11, 722.931 as of 6/1/11 in MODEL 212.0/2

Function requirements for limp-home mode, general

Circuit 87 ON
Circuit 61 ON

Limp-home mode in general for vehicles up to facelift 13

In order to guarantee a safe driving condition and to avoid damage to the transmission, the fully integrated transmission control unit (Y3/8n4) switches to limp-home mode in the event of critical faults.

The fault is stored in the fault memory with the assigned fault code and the engine diagnosis indicator lamp (A1e58) in the instrument cluster (A1) is actuated. The fault is also sent to the ME-SFI [ME] control unit (N310) over the chassis CAN (CAN E).

For vehicles as of facelift 13 the current chassis CAN will be replaced by the chassis CAN 1 (CAN E1). A second chassis CAN 2 (CAN E2) is used between the instrument cluster and the front SAM control unit with fuse and relay module (N10/1).

In the event of a hardware fault, the following control solenoid valves are switched off and the transmission shifts to 6th gear:

Working pressure control solenoid valve (Y3/8y1)
Clutch control solenoid valve K1 (Y3/8y2)
Clutch control solenoid valve K2 (Y3/8y3)
Clutch control solenoid valve K3 (Y3/8y4)
Multidisk brake control solenoid valve B1 (Y3/8y5)
Multidisk brake control solenoid valve B2 (Y3/8y6)
Multidisk brake control solenoid valve B3 (Y3/8y7)
Wet clutch control solenoid valve (Y3/8y9)

After selector lever position "P" has been activated, it is possible to engage selector lever position "R" or "D".

In selector lever position "D", the transmission shifts to 2nd gear.

If hydraulic faults occur, the transmission remains in the respective gear.

In the event of control solenoid valve faults, the affected gear is disabled and no longer actuated. As a result the vehicle can be brought to the nearest Mercedes-Benz service operation.

Up to 16 faults can be stored simultaneously in the fault memory. These can be read out using Xentry diagnostics.

Overview of system components for automatic transmission (AT)

GF27.10-P-9992AHX