AD07.61-P-4000-52BA | Cylinder shutoff valves do not close at cylinder shutoff OFF, ME-SFI fault code description | Engine 113.960 from 6/00 with Code (479) Cylinder shutoff | |
Cylinder shutoff valves (Y80, Y81) do not close at cylinder shutoff OFF | ||
1 | Fault code ( Display on generic scan tool) | P209C Cylinder shutoff valve (Y80) right cylinder bank (-) P209D Cylinder shutoff valve (Y81) left cylinder bank (-) |
2 | Fault storage Activation of the engine diagnosis indicator lamp (EURO3/4) or CHECK ENGINE (MIL) malfunction indicator lamp | After expiry of test duration and fault No activation |
3 | Checking frequency Monitoring time | Continuous with cylinder shutoff OFF Approx. 5 s after test prerequisites are fulfilled |
4 | Fault setting conditions | Air mass too small (does not comply with 8-cylinder engine) and misfires |
5 | Check prerequisites | - Engine speed around 500 to 4500 rpm and constant - Medium, constant load (intake manifold pressure around 200 to 1000 hPa) - No fault in hot film mass air flow sensor, crankshaft position sensor, pressure sensor (intake manifold) - Exhaust gas recirculation diagnosis not active |
6 | Check procedure | If despite cylinder shutoff OFF, the intake and exhaust valves remain closed, the air mass drawn in by the engine is too small and a fault is suspected. Misfire at cylinder 2 and 3: cylinder shutoff valve for right cylinder bank does not close Misfire at cylinder 5 and 8: cylinder shutoff valve for left cylinder bank does not close |
7 | | - In the event of the simultaneous occurrence of a fault at the cylinder shutoff valve and TWC-damaging misfires, first replace the cylinder shutoff valve. - With fault code P209C and P209D do not close both cylinder shutoff valves. - If a fault occurs, the engine diagnosis malfunction indicator lamp is actuated immediately due to the simultaneous active fault detection of a "TWC-damaging" misfire. |