Torque Converter Clutch, Checking

Torque converter clutch, checking - 01V, 5 Speed A/T

Note:
^ Check DTC memory of Transmission Control Module (TCM) J217 before troubleshooting.
^ Check also DTC memory of Engine Control Module (ECM), as DTCs of the Engine Control Module (ECM) can lead to transmission malfunctions.
^ Check ATF level before troubleshooting.





Torque converter clutch can only be checked when driving in On Board Diagnostics (OBD).

CAUTION!
^ Test and measuring equipment must always be secured to the rear seat and operated from there by a second person.
^ If test and measuring equipment is operated from the passenger seat, the person seated there could be injured in the event of an accident involving deployment of the passenger-side airbag.

- With ignition switched off, connect Vehicle Diagnosis, Testing and Information System VAS 5051 to Data Link Connector (DLC).
- Start engine.





Display on VAS 5051:
- Tap Vehicle Self-Diagnosis button.





Display on VAS 5051:
- In selection - 1 -, click on function "02 - Transmission electronics".
- Wait until the next indication appears on display.





Display on VAS 5051:
- From list - 1 - select function "08 - Reading measured value block".





Display on VAS 5051:
1- Enter display group, max. input value = 255

- In button field - 2 -, tap 7 button for "display group 007" and confirm entry by tapping Q button.
- Perform a road test.





Display on VAS 5051:
- Check indication in display fields - 3 - and - 4 -. Specified values:

3- TC closed
4- 0 to 20/min

If indications do not resemble description, ratio of transmission RPM to engine speed with closed torque converter clutch does not match (implausibility).

^ Causes:

- Torque converter clutch circuit malfunctioning, worn.
- Incorrect torque converter.
- Automatic Transmission Pressure Regulating Valve 4 N218 mechanically malfunctioning.
- Problems in ATF lines to Automatic Transmission Pressure Regulating Valve 4 N218.
- Valve for torque converter pressure malfunctioning.
- Torque converter clutch valve faulty.
- Press <-- button to end function "08 - Read measured value block".
- Select "06 - End output" function.
- Switch off ignition and disconnect diagnostic connector.