The primary function of the igniter is to turn on and off the primary coil current based on the IGT signal received from the ECM. The igniter or ECM may perform the following functions:

• Ignition Confirmation (IGF) signal generation unit.

• Dwell angle control.

• Lock prevention circuit.

• Over voltage prevention circuit.

• Current limiting control.

• Tachometer signal.

It is critical that the proper igniter is used when replacing an igniter. The igniters are matched to the type of ignition coil and ECM.

IGF Signal


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