On-Board Diagnostics

Type of diagnosis: 

• Continuous. Ceases when fault criteria fulfilled. Restarts next driving cycle.

Enable criteria: 

• General condition for this diagnostic trouble code: Atmospheric pressure must exceed 72 kPa as well as coolant and intake air temperature must exceed -7°C.
• Main relay voltage exceeds 10V. Speed above 45 km/h for longer than 60 s accumulated time. Coolant temperature between 78 and 115 °C. Engine speed between 700 and 4000 RPM. Purge active. No fuel shut-off. No change in bypass valve status. Pressure ratio for pressure after and before the throttle between 0.2 and 0.7. Throttle opening between 50 and 500 mm² . Even engine load.
• Mass air flow is calculated using the throttle valve angle and pressure difference before and after the throttle.

Fault criteria: 

• Conditions for test 1, 2, 3 or 4 fulfilled.
  • Test 1:  Mass air flow sensor indicates more than 12% lower value than that calculated while the multiplicative adaptation is greater than 17%.
  • Test 2:  Mass air flow sensor indicates more than 12% higher value than that calculated while the multiplicative adaptation is lower than -17%.
  • Test 3:  Mass air flow sensor indicates more than 30% lower value than that calculated.
  • Test 4:  Mass air flow sensor indicates more than 30% higher value than that calculated.

Dependents: 

• P0112 , P0113 . P0106 , P0107 . P0108 , P1105 , P1106 , P1107 , P1108 , P1230 , P0501 , P0502 , P1625 , P0444 , P0445 .

System reaction to a fault: 

• Fuel adaptation reset. Intake pressure and intake air temperature used as substitute values.

OK report: 

• Enable criteria fulfilled without fault reports.

Fault handling:  (For more information, see FAULT HANDLING III, OTHER EMISSION-RELATED COMPONENTS AND FUNCTION )

• Type III.