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IGT1, IGT2, IGT3, IGT4 control

Fig 1: IGT1, IGT2, IGT3, IGT4 Control Wave Pattern Signal

Courtesy of MAZDA MOTORS CORP.

PCM terminals

IGT1 (ignition coil No. 1) : 1BC (+) -body ground (-)
IGT2 (ignition coil No. 2) : 1BI (+) -body ground (-)
IGT3 (ignition coil No. 3) : 1BO (+) -body ground (-)
IGT4 (ignition coil No. 4) : 1BU (+) -body ground (-)

Oscilloscope setting

2 V/DIV (Y), 20 ms/DIV (X), DC range

Vehicle condition

Idle after warm up