VALIDATION OF A SIGNAL FROM A CRANKSHAFT SENSOR

The invention relates to a method for switching between a degraded mode and a normal mode for establishing the angular position of an internal combustion engine () of a vehicle (), the method comprising the steps of, in degraded mode, detecting the free space and the teeth of the toothed wheel () of the crankshaft () during the rotation of the crankshaft () from the signal generated by the crankshaft sensor (), establishing the angular positions of the crankshaft () corresponding to the minimum rotation speeds of the top dead centres established, and switching to normal mode when, for each top dead centre, the deviation between the angular position of the crankshaft () and a reference position is less than a position threshold for at least one revolution of the crankshaft ().