A/T - Harsh Shifts/Hard To Select 'D' Or 'R'

SI M 24 02 08
Automatic Transmission

July 2008
Technical Service

SUBJECT
R55, R56 with F21 Transmission - Various EGS Faults Caused by Wiring Harness Damage

MODEL
R55 (Clubman, Clubman S) with F21 ASIN 6-speed automatic transmission

R56 (Cooper, Cooper S) with F21 ASIN 6-speed automatic transmission

SITUATION
The customer may complain of the following:

^ It is difficult to engage the D or R gears from the Park position.

^ Gear shifts are extremely harsh during driving.

^ Intermittently, the transmission warning light ("gear indicator") may be displayed.

During the diagnosis, various combinations of the following fault codes may be stored in the EGS module:

^ 4E21, 4E22 - Electronic pressure control valve SLT

^ 4E2C - Electronic pressure control valve SLU

^ 4E35, 4E36 - Electronic pressure control valve SLC1

^ 4E3F, 4E40 - Electronic pressure control valve SLC2

^ 4E4A, 4E49 - Electronic pressure control valve SLC3

^ 4E54 - Electronic pressure control valve SLB1.

CAUSE
Possibly the transmission wiring harness is damaged and is chafing against the transmission housing; or the A/C condenser pipe or an electronic pressure valve fails intermittently.

SOLUTION





On a customer complaint basis, prior to executing the appropriate DIS Test Plan, visually inspect the transmission harness in the area close to the transmission mount, and behind the A/C condenser pipe (on top of the gear box areas indicated by # 1).

If chafing is detected, the damaged part of the harness should be repaired and insulated, using a good quality adhesive tape (Wurth Black Cloth Friction Tape, article number 1985 620, may be used for this procedure).
For more information on this product, please visit www.wurthusa.com or call 1-800-WURTHUSA.

Diagnostic Hint:

If there is no defect found in the transmission wiring harness or connectors, then most likely the faults are caused by the intermittent failure of one of the electronic pressure control valves. In such a case, the valve body assembly should be replaced.

Do not replace the complete automatic transmission assembly for the complaints caused by the fault codes related to the electronic pressure control valves.





WARRANTY INFORMATION
Covered under the terms of the MINI New Vehicle Limited Warranty or the MINI NEXT Certified Preowned Program.





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