A/T - Failsafe Mode/Can't Shift Gears/Fault Codes Set
SI B 23 07 06Manual Transmission
March 2010
Technical Service
This Service Information bulletin supersedes SI B23 07 06 dated February 2010.
[NEW] designates changes to this revision
SUBJECT
M5, M6 with SMG III; FC 4F42/4F43 - Hydraulic Unit Faults
MODEL
E60 (M5) with GS7S47BG SMG transmission
E63 (M6) with GS7S47BG SMG transmission
SITUATION
^ The SMG transmission goes into failsafe mode with "Trans Light" illuminated.
^ Gears may not be selected or changed. If the SMG transmission is stuck in any gear, the engine cannot be restarted.
^ Any combination of the following fault codes may be stored in the SMG control unit (listed by frequency of occurrences):
^ 4F42 - Hydraulic unit, on period;
^ 4F43 - Hydraulic unit activation frequency, pressure build-up; and
^ 4F40 - Hydraulic unit, pressure range undershot.
^ In most cases, fault code 4FA0 (Clutch activation, position deviation) is also stored with the SMG hydraulic system-related faults.
NOTE:
If fault code 4FA0 (usually with FC 4F80 - "Transmission problem") is stored without any of the hydraulic system-related faults, refer to SI B21 02 06 for proper diagnosis.
Also refer to SI B23 02 06 for additional information regarding towing SMG-equipped vehicles.
CAUSE
Intermittent failure in the SMG III hydraulic system
CORRECTION
Interrogate the SMG fault memory and execute the appropriate ISTA test modules in the following sequence:
1. Start with Test Plan S2360_S3TFK - "Calculate accumulator pre-pressure charge". Perform it at least 4 times. If the test module fails, most likely the pressure accumulator is defective and should be replaced. After the replacement is concluded, perform test module S2360_S3TFK again to verify repair effectiveness.If the results are inconclusive, or if fault code 4FA0 (Clutch activation) is stored in conjunction with FCs 4F42/4F43, proceed to:
2. Test Plan B2360_S3KUP -"Clutch". Work through all the submenu selections from 1 to 5. If the results are inconclusive, proceed to:
3. Test Plan B2360_S3HYE - "Hydraulic unit". From the test submenu, select: "(4) Function check, pressure build-up". If the hydraulic pump fails to activate during the test, proceed to:
4. Test Plan B2360_S3HYR - "Hydraulic pump". From the test submenu, select: "(4) Function check, hydraulic pump relay". Using the MFK1 adaptor and 40-pin break-up box (P/N 12 1 300/303), diagnose the SMG pump relay operation. Replace the hydraulic pump relay (K6318) if it is defective.
5. [NEW] If, during diagnosis, the SMG hydraulic system (or a hydraulic pump) fails one of the executed test plans, submit a PuMA TC Case under Getrag TC Action "M5/6 SMG3 - FC 4F42/43" for additional diagnostic and troubleshooting hints.
[NEW] Important:
As of March 1st, 2010, a Part Replacement Authorization is required before replacing the SMGIII Hydraulic Unit manufactured by GETRAG (SI B23 01 08).
6. [NEW] If replacement of the complete SMG Hydraulic Unit (P/N 21 54 2 282 998) is approved by Getrag TC, use the following procedure below.
PROCEDURE
Important:
1. Prior to any work on the SMG hydraulic system, the operating pressure must be reduced through test plan "Replacement and repair S2360_S3SRV". Select (4) "Hydraulics"; then (3) "Before working on the hydraulic system - pressure reduction", found in "Service Functions"/"SMG transmission control".
2. Remove the SMG pump relay (K6318, black) located in the E-box. The K6318 relay should not be reinstalled until the repair procedure is completed.
3. Remove the SMG transmission from the vehicle. For removal instructions, refer to RA23 00 613, found in TIS.
4. Place and secure (e.g., with wooden blocks) the SMG transmission on the appropriate workbench.
Important:
Make sure that the transmission fluid cooler/lines located at the bottom
are not damaged.
NOTE:
The special SMG III transmission fixture tool shown in the illustration (24 0 200) will be available in the near future for easier handling of the unit.
5. Unclip the valve block wiring harness from the metal clips.
6. Remove one M8X35 Torx bolt (2) at the fluid reservoir.
Note on reassembly:
Use the new bolt (P/N 07 12 9 903 927) and torque it to 22 Nm.
7. Remove the two M8 self-locking hex nuts securing the clutch slave cylinder to the bell housing.
Note on reassembly:
Use the new self-locking nuts provided (P/N 07 12 9 904 877). Torque them to 22 Nm.
8. Remove the two M8X80 Allen head bolts (#1 on the pump housing), and the two M8X25 Torx head bolts securing the hydraulic pump assembly (#1 on the pump/accumulator bracket).
Note on reassembly:
Clean the internal threads in the transmission housing to remove any residual locking material. Use the new bolts provided: M8X80 P/N 07 11 9 901 036, M8X25 P/N 07 12 9 903 925, Use Loctite 243 with the two M8X25 bolts. Retorque all bolts to 22 Nm.
9. Remove 11 M8X25 Allen head bolts from the actuators block assembly.
10. Using an appropriate tool (e.g., a plastic wedge), carefully pry off the actuator block assembly from the transmission housing.
Note:
Make sure that the transmission housing sealing surface is not damaged or scratched during the removal process.
11. Cover the transmission selector forks with a clean, lint-free cloth, and remove the residual sealing material from the sealing surface.
12. If one of the centering sleeves (1) remains in the removed actuator block, it should be removed and discarded. In such a case, install a new sleeve (P/N 23 01 7 838 947) in the transmission housing.
13. Align the transmission actuator forks (1) in the central position, as shown on the illustration.
14. Apply a thin coat of Loctite(R) 518 on the mating surface (2).
Note:
Loctite(R) 518 can be purchased from the BMW PDCs using the P/N 83 19 0 395 783.
15. Carefully remove the replacement SMG Hydraulic Unit (P/N 21 54 2 282 998) from its original packaging and protective foam. Make sure that all shifting pistons of the actuator block are centered, with the rounded areas of the shafts pointing upwards (as shown in the illustration).
16. With the help of another person, position the pump/reservoir/slave cylinder unit on the side of the transmission, and at the same time gently place the actuator block on the transmission top opening.
17. Align the centering sleeves with the corresponding holes in the actuator block, and gently press on the block until it perfectly fits on the mating surface.
18. Secure the actuator block with 11 new M8X25 bolts (P/N 07 11 9 901 024), and torque them to 22 Nm.
19. Secure the pump/reservoir and clutch slave cylinder with the bolts and nuts provided.
Important:
The SMG Hydraulic Unit comes prefilled with Pentosin CHF 11S fluid. Remove the rubber green transportation seal cap from the reservoir breather. Install the black rubber cap provided with the replacement kit.with the replacement kit.
20. Reinstall the SMG transmission.
21. Connect the vehicle to DIS/GT1. From the Service Functions, select SMG Transmission, Replacement and Repair S2360_S3S RV test module, and then:
^ Select: (4) Hydraulics
^ Select: (2) After replacing hydraulic unit with actuator block
^ And then perform 3 service functions, in the following sequence:
1. Teach-in clutch valve characteristic values
2. Adapt complete transmission
3. Teach-in clutch slip point.
Important:
It is not required to perform the bleeding procedure of the actuator block or clutch slave cylinder, since the hydraulic unit comes prefilled. Reinsert the K6318 hydraulic pump relay only when prompted by a test module request.
22. If needed, top up the hydraulic fluid level using Pentosin CHF 11S (P/N 82 11 1 468 041).
PARTS INFORMATION
[NEW]WARRANTY INFORMATION