IGT1, IGT2, IGT3, IGT4 control

Fig 1: IGT1, IGT2, IGT3 And IGT4 Control Voltage Graph

Courtesy of MAZDA MOTORS CORP.

PCM terminals 

• IGT1 (ignition coil No. 1): 1AY(+)-body ground(-)
• IGT2 (ignition coil No. 2): 1AT(+)-body ground(-)
• IGT3 (ignition coil No. 3): 1AO(+)-body ground(-)
• IGT4 (ignition coil No. 4): 1AJ(+)-body ground(-)

Oscilloscope setting 

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

Vehicle condition 

• Idle after warm up