Hot film MAF sensor | ||
1A | Fault code ( Readout on generic scan tool) | P2004 (P0100) |
1B | Engine 112 as of 1/01 Fault code ( Readout on generic scan tool) | P2004-[1] Short-circuit to positive (P0103) P2004-[2] Short circuit to ground/line discontinuity (P0102) P2004-[4] Plausibility (P0104) P2004-[8] Plausibility (P0101) |
2 | Fault storage Actuation of the engine diagnosis indicator lamp (EURO3/4) or CHECK ENGINE (MIL) malfunction indicator lamp | after expiry of test duration and fault following two successive driving cycles with faults |
3 | Checking frequency | Continuous |
4 | Checked signal or status | Signal limits from hot film mass air flow sensor |
5 | Fault setting conditions Checking duration | - For ignition ON, the hot film MAF sensor signal must be 0.98 to 1.03 V. - Plausibility: At partial load the air mass must not deviate by more than 30% from the reference value. The reference value is calculated from the throttle valve angle, engine speed, intake air temperature, barometric pressure and intake manifold absolute pressure. - About 5 seconds per limit value |
6 | Check prerequisites | - no cylinder-selective inertia fuel cut-off active - ESP not active - engine speed greater than 400 rpm - no fault in throttle valve actual value potentiometer - change in engine load less than 20 to 70% - battery voltage less than approx. 15.6 V. |
7 | | In case of plausibility faults check the grid on the hot-film MAF for dirt. A further causes could be a high ohm shunt (e.g. in a connector). |