P0101 00 |
Continuous |
Battery voltage must be between 11 - 16 V. |
Vehicle speed above 30 km/h for more than 60 s accumulated time. |
Coolant temperature between 71°C and 115°C. |
Engine speed between 1400 and 4000 rpm. |
No fuel shut-off. |
Air mass 7 - 20 g/s. |
Conditions for test 1, 2, 3 or 4 are fulfilled. |
Test 1 |
• | The mass air flow sensor shows a value 12% lower than the calculated one while multiplicative adaptation is greater than 17%. |
Test 2 |
• | The mass air flow sensor shows a value 12% higher than the calculated one while multiplicative adaptation is less than -17%. |
Test 3 |
• | The mass air flow sensor shows a value 30% lower than the calculated one. |
Test 4 |
• | The mass air flow sensor shows a value 30% higher than the calculated one. |
P0107, P0108 |
P0112, P0113 |
P0237, P0238 |
The system continues to function with a calculated air mass instead of the value from the mass air flow sensor. |
Boost pressure adaption is blocked and reset. |
Limited acceleration and idle function. |
Cruise control blocked. |
Secondary air pump not active, if fitted. |
Diagnosis completed without fault report. |
Type III |
(See section Fault handling III, "Other emission-related components and functions" for more information.) |
The DTC indicates that the value from the mass air flow sensor has been deemed unreliable after comparison with a calculated value. This could be due to an air leak or a faulty mass air flow sensor. |
The air mass signal is compared to a calculated value under light, normal and continuous engine loads. The calculated value is derived from the pressures given by the pressure sensors in the intake system. |
First check the integrity of the intake system. Then continue with fault diagnosis. |
If DTC P0171 or P0172 is stored, it is cleared by P0101. |
Test value: |
• | Air Mass |
• | Airmass / Combustion |
• | Airmass / Combustion Calculated |
(See also description of readings/activations in diagnostic tool) |