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• P1090

  P1090

  
  

  Diagnosis information - DME V6 DFI MAF: electric fault

  Diagnostic conditions

• Battery positive voltage > 7.5 V
• Engine speed < 2,000 rpm
• Throttle valve position < 10 %
• approx. Test drive of approx. 20 minutes with changing load conditions
  
  

  Possible fault causes

• Open circuit in voltage supply
• Short circuit to ground in power supply
• Short circuit to B+ in power supply
• Open circuit in signal line
• Short circuit to ground in signal line
• Short circuit to B+ in signal line
• Hot film mass air flow meter faulty
  
  

  Affected contacts on the DME control unit connector

  
  
  Connector [B]:
• Contact 85
• Contact 58
• Contact 64
  
  

  Affected contacts on the hot film mass air flow meter connector

• Contact 3 ground
• Contact 4 power supply 5 V
• Contact 5 signal