Ignition Coil & Power Transistor

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The ignition signal from the ECM is sent to and amplified by the power transistor. The power transistor turns ON and OFF the ignition coil (1) primary circuit. This ON/OFF operation induces the proper high voltage in the coil secondary circuit.

Fig 1: Identifying Ignition Coil

Courtesy of NISSAN MOTOR CO., U.S.A.