Injection twice/combustion

Before the camshaft position has been detected, injection will take place semi-sequentially at 180 intervals. This means two cylinders at a time in the following order:

Fig 1: Identifying Camshaft Position

Courtesy of SAAB-SCANIA OF AMERICA, INC.

1. Cylinders 1 and 4.
2. Cylinders 2 and 3.

Each injector injects fuel once per crankshaft rotation and this means that the basic duration must be divided by two.