Sub-Crank Angle Sensor (Q45)

In the event optical crank angle sensor should fail, sub-crank angle sensor acts as its back-up. Sub-crank angle sensor consists of a magnetic pick-up and a signal rotor containing 8 machined grooves. Sensor produces a fluctuating AC voltage signal to ECU.

Sensor is capable of producing an RPM signal only, not a No. 1 cylinder TDC signal. While sensor is providing RPM input (during crank angle sensor failure), ECU will operate in a fail-safe mode, resulting in simultaneous rather than sequential fuel injection.