Idling speed ignition timing: Notes

Fig 1: Identifying Idling Speed Ignition Timing Communication Diagram (1 Of 2)

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This function is used when the engine is idling, i.e. accelerator pedal released. The objective of idling speed ignition timing is to make sure the engine runs with optimum ignition advance.

Together with engine air mass control, idling speed ignition timing makes sure the engine develops the correct idling speed/torque to drive e.g. the generator, power steering pump and A/C compressor.

Fig 2: Identifying Idling Speed Ignition Timing Communication Diagram (2 Of 2)

Courtesy of SAAB-SCANIA OF AMERICA, INC.