AD07.61-P-4000-55B | Fault code description when one intake valve of a cylinder is not actuated with cylinder cut-out system OFF, ME-SFI | Engine 113.960 up to 5/00 with code (479) cylinder cut-out system |
1 | Fault code | |
2 | Fault storage Activation of malfunction indicator lamp for engine diagnosis | after the end of the test period and faults no activation of the malfunction indicator lamp |
3 | Frequency of the test Monitoring period | continuous approx. 5 s |
4 | Fault setting conditions | Combustion misfire (detection via smooth operation assessment) detected in the upper load and speed range |
5 | Test prerequisites | - engine speed approx. 5000 rpm - load > approx. 80% - no fault in hot film mass air flow sensor, crankshaft position sensor, pressure sensor (intake manifold) - no fault at cylinder cut-out system valves (Y80, Y81) |
6 | | - If, due to a defective rocker arm coupling (rocker arm, coupling pin), only one intake valve of a cylinder is actuated, this leads to misfires in the upper load and speed range. - The fault code output only serves as additional service information, since with this test, the cause cannot be definitively assigned to the cylinder cut-out system. - If this fault occurs, the engine diagnosis malfunction indicator lamp is activated immediately due to the simultaneously active fault identification for a misfire "damaging to TWC". |