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• P2181

  P2181

  
  

  Diagnosis information - DME V6 DFI Thermostat stuck open

  NOTE: This fault is stored if the engine is not heated from below 40 °C (104 °F) to over 60 °C (140 °F) after throughput of a defined mass air flow. This indicates that the thermostat may be stuck in open position.

  An unchanged temperature signal may also be caused by a faulty sensor, however. Check the fault memory entry.
  
  

  NOTE: The fault can be checked best on a dynamic power analyser.

  
  

  CAUTION:

  Danger - heavy drive line - damage may result if unsuitable test stands are used. Use only a suitable dynamic power analyser for four-wheel-drive vehicles (e.g. MAHA LPS 2000).

  
  

  Diagnostic conditions

• Engine running
• Engine start temperature between -10 °C (14 °F) and 50 °C (122 °F)
• Ambient temperature between -10 °C (14 °F) and 42 °C (108 °F)
• No vehicle speed fault
• Engine temperature increase after start calculated by way of mass air flow throughput corresponds to a temperature of above 60 °C (140 °F).
  
  

  Possible fault causes

• Thermostat stuck open
• Engine temperature sensor faulty
  
  

  Affected contacts on the DFI control unit connector

  
  
  Connector [A]:
• Contact 10
• Contact 14
  
  

  Affected contacts on the engine temperature sensor connector

  
  
  Connector [A]:
• Contact 1
• Contact 2