Code 41 (1.6L Turbo) - Cam Signal Circuit: Notes

For timing of the injectors, Hall Effect switch is used. Hall Effect sends a signal to ECM when cylinder No. 1 is 25 degrees ATDC on compression stroke. This signal is used to start the correct injector sequence. Engine will continue to run if cam signal is lost while running, but will not restart if engine is stopped. If failure is in Hall Effect switch output Yellow/Blue wire to ECM terminal B9, a Code 41 will be set. Code 41 is set when engine is cranking.

1. Checks to see if B+ and ground are all at Hall Effect switch.
2. Checks to see if Hall Effect sensor is sending out a signal to ECM.
3. Checks to see if Yellow/Blue wire from Hall Effect to ECM is open or grounded. The amount of voltage depends upon the position of the vane in the dual cam sensor housing.