A L L Diagnostic Trouble Codes ( DTC ): P Code Charts M166 (Throttle valve actuator) : The throttle valve is amming or is stiff. (P2176)

2010 Mercedes Benz C 300 4MATIC (204.081) V6-3.0L (272.948)  
A L L  Diagnostic Trouble Codes ( DTC ): P Code Charts M166 (Throttle valve actuator) : The throttle valve is amming or is stiff. (P2176)
M166 (Throttle valve actuator) : The throttle valve is amming or is stiff. (P2176)

Possible cause:
- M16/6 (Throttle valve actuator) Affected functions:
- Engine diagnosis - Engine running

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  Test 1: Check component M16/6 (Throttle valve actuator).
1. Check component M166 (Throttle valve actuator).
  Test 1.1: Check component M16/6 (Throttle valve actuator) using actual value.
  Test 1.2: Check component M16/6m1 (Actuator motor) by means of actuation.
  Test 1.3: Perform mechanical inspection of component M16/6 (Throttle valve actuator).
  Test 1.4: Note : Control unit programming must be performed on control unit variants VC6 to VC8.
1.1. Check component M166 (Throttle valve actuator) using actual value. Warning!Communication with EC reuired.

1.2. Check component M166m1 (Actuator motor) by means of actuation. Test prerequisite
- Operate engine at idling speed. Note
- If the throttle valve angle is 11 unmetered air may be present. Status of relevant actual value: - Throttle valve angle:Warning! Communication with ECU required. Move on to actuation with button F2
1.3. Perform mechanical inspection of component M166 (Throttle valve actuator). Test sequence
- Switch off ignition. - Expose component M16/6 (Throttle valve actuator). - Slowly operate throttle flap by hand up to full load. Specified value
- The throttle valve must not stick and must close by internal spring force. Question
- Is the test o.k?

YES The test is o.k..End of test
NO The test is not o.k..Possible cause and remedy
- Check intake tract for residue and clean if necessary.If no residue is present replace component M16/6 (Throttle valve actuator).

1.4. Note : Control unit programming must be performed on control unit variants VC6 to VC8.
2010 Mercedes Benz C 300 4MATIC (204.081) V6-3.0L (272.948)       Copyright ? 2013, ALLDATA     10.52SS        Page 2
1.4. No further information available.