The measurement value is OK.Cause
- Control module has an internal error.
REMEDY
- Disassemble and assemble automatic transmission using the repair instructions.
- Exchange electrohydraulic control unit.
IMPORTANT NOTEFollowing the repair measures, the following checks MUST be carried out using the Diagnosis Assistance System, menu
'Control unit adaptations'
- Flash programming of control unit Y3/8n4 (Fully integrated transmission control (VGS) control unit)
- SCN coding
End of test
NO
The measurement value is not OK.Possible cause and remedy
- Diagnostic cable has short to ground.
- Inspect wiring and connectors at connection points for loose contacts, damage and corrosion. Repair or replace as required.
End of test
NO
The measurement value is not OK.Possible cause and remedy
- Diagnostic cable has open circuit.
- Inspect wiring and connectors at connection points for loose contacts, damage and corrosion. Repair or replace as required.
End of test
NO
The measurement value is not OK.Further causes
- Voltage supply line is not OK.
Press button "F2" for further tests
1.1.3.2.2.13. No further information available.
1.1.3.3. Test with the aid of the measuring system
Test sequence
- Measurement of level voltage of engine CAN buses CAN bus High and CAN bus Low with the universal oscilloscope
- Separating one user from the connector strip X30/5 (Left voltage distributor (CAN) connector)
- Observe level voltage.
- Plug in connector again at connector strip X30/5 (Left voltage distributor (CAN) connector).
- Repeat this procedure for all CAN users.
Specified value
- As soon as the faulty branch was disconnected, the current image of the level voltage changes.
Possible cause of fault in the faulty branch
- X30/5 (Left voltage distributor (CAN) connector)
- Test connectors and wiring for CAN of engine compartment CAN control modules.
- Control unit
Communication with ECU required ( Measuring system )
1.1.3.4. Display CAN signals with the aid of the special tool 'Star Diagnosis CANtool'.
Important notes
- When CAN diagnosis is finished, the 8-pin CAN cable must be replaced with the diagnostic cable.
- Before values are read out from a control unit, the control unit must be reinitialized.
Continue with button F2
Test 1.1.3.4.1: Actual values via CAN ( Engine CAN bus )
1.1.3.4.1. Actual values via CAN ( Engine CAN bus )
Note
- The actual values shown on the following screens are only displayed and updated as long as the CAN bus is active.
Continue with button F2
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