Fault Information


Fault Code Description
The fault is detected if the difference between the measured and the calculated air mass is too great.
The air mass measured is too low compared to the air mass calculated.
Fault Code Conditions
General Conditions Monitoring runs continuously with active exhaust-gas recirculation control in the following time grid: 20 ms.
Control unit voltage: 9.5 V to 16 V.
Terminal Condition

Driving Conditions
Fault Time Condition
The fault is entered if it is present for longer than the following period (debounce time): 5000 ms
Service Plan
Check the following possible fault causes:
1. Leak in the air mass system before the compressor (air cleaner, intake silencer, air pipes).
2. Exhaust-gas recirculation valve jams open (in conjunction with faults relating to the exhaust-gas recirculation valve).
3. Exhaust gas pressure sensor before the turbine faulty (in conjunction with faults on the exhaust gas pressure sensor)
4. Charging pressure sensor faulty.
5. Charge-air temperature sensor displays wrong values (most of the times without fault entry).
6. Check intake ports and intake valves for sooting.
Fault Impact
None
Warnings
Warning Lights Malfunction indicator lamp
Control Center Messages
Service Notes
The fault can occur when the exhaust turbocharger is mechanically damaged (compressor broken). The jammed compressor causes a high flow resistance which leads to a strong vacuum in the intake area after the compressor. This causes the measured air mass being too low.
Usually, this fault occurs in conjunction with a charging pressure control deviation.
Note:
With the series F01, F02, F04, F06, F07, F10, F11, F12, F13 and F18, it is possible that the unfiltered-air snorkel is closed by a lid after work on the cooling air routing. This is the case if the lid has been installed on the wrong side of the cooling air routing.
If leaks were found in the air mass system, the following service function must be carried out: Delete adaptations, air mass system.
If the exhaust gas pressure sensor upstream of the turbine is being renewed, the following service function must be carried out: Delete adaptations, exhaust emission system.
If the exhaust-gas recirculation valve is being renewed, the following service function must be carried out: Delete adaptations, air mass system.