Sync Position %

Sync Position %

Sync Position refers to the point at which the ECU identifies the Sync Edge location. This reference point is critical, as any mechanical variation between the crank and cam trigger positions, such as timing belt or chain slack, can cause the Sync Position to move.

Variations in the Sync Position can result in crank/sync errors, changes in the detected engine cycle, or even an incorrect firing order, particularly when using a non-missing crank trigger setup.

Emtron calculates the following channel for monitoring, diagnosis, and logging purposes - Sync Position %

The Sync Position % is calculated by factoring the position of the Sync Edge between consecutive Crank Teeth.

Looking at falling edges, the distance between crank teeth can be identified by the green lines, and the sync edge is identified by the yellow arrow. The value would be Sync Position % - 33% approximately in this case.

NOTE: The higher the crank tooth count, the less resolution this runtime generally will have. IE a 60-2 trigger will have a much more unstable Sync Position % value vs a 1-Tooth Per TDC