EP179A16

The redundancy system for DIRECT SELECT was activated. The limit value for electrical voltage has not been attained.


Possible cause:

- A80 (Intelligent servo module for DIRECT SELECT)
Affected functions:

- Drive position selection

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Test 1: Remedial action after failure of the actuator motor in component A80 (Intelligent servo module for DIRECT SELECT) due to undervoltage

1. Remedial action after failure of the actuator motor in component A80 (Intelligent servo module for DIRECT SELECT) due to undervoltage
Operation number of operation texts and work units or standard texts and flat rates:27-0641Test sequence

- Switch off ignition.
- Disconnect connector at component N15/5 (Electronic selector lever module control unit).
- Switch on ignition.
- Measure direct voltage with multimeter between 5 and 4
Specified value

- Voltage[8.5...15.0] V
Question

- Is the measurement value OK?







YES
Preconditions

- The measurement value is OK.
NOTE

- The following tests are to be performed in succession
- If this fault code is currently displayed, the desired change of drive mode may not be performed when the selector lever is actuated.In this case, move the selector lever to position "D" and hold until the following actual value display has changed.
Test sequence

- Depress brake pedal fully and hold.
- Use the selector lever to engage drive positions R, N and D in succession.
Status of relevant actual value:'Shift lock' function
- 'Shift lock' function:Warning!
Selector lever position
- Current position of actuator motor ISM:Warning!
Question

- Are the listed actual values correctly displayed?


YES
Preconditions

- The listed actual values are correctly displayed.
Possible cause and remedy

- No additional tests are necessary.
- Erase fault memory in control unit ISM
End of test

NO
Preconditions

- The listed actual values are not correctly displayed.
Further procedure

- Perform actuation 'Driving position'.
Continue with button "F2"

Test prerequisite

- Engine OFF
- Apply and hold the brakes.
Continue with button "F2"

Warning!Communication with ECU required.


NO
The measurement value is not OK.Possible cause and remedy

- Check fuse f111 (voltage supply from control unit ISM) in component F58 (Engine compartment fuse and relay box).
- Check all affected plugs, connectors and electrical components for damage, loose contact, corrosion etc. and repair if necessary.
End of test