Crankshaft sensor: Description

The diagnosis is different depending on whether it takes place before or after synchronization.

Before synchronization, a crankshaft error is detected if a number of plausible camshaft signal edges were detected and the system is still not synchronized with the crankshaft signal. After synchronization the number of teeth per revolution is monitored. Detection of more than two supplemental or missing teeth will reset the crankshaft signal acquisition.

Loss of the crankshaft signal after synchronization is detected as engine stop and the error will be detected as before synchronization.

For systems with a magnetic crankshaft sensor an electrical error can be detected by the extended MCPS diagnosis before or after synchronization. For systems with an active crankshaft sensor LV_CRK_OC_ERR is always 0.

After crankshaft error detection the system may operate in limp-home mode if applicable. If this is the case then the crankshaft signal will be simulated and no further functional diagnosis will be performed.