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H27 engine

Oscilloscope waveforms of CMP sensor REF signal and No.1 ignition trigger signal are as shown in figure when connecting oscilloscope between terminal "C51-1-13" of ECM connector connected to ECM and ground, and between terminal "C51-2-28" and ground.

Fig 1: Identifying Oscilloscope Waveforms Of CMP Sensor REF Signal (H25 Engine & H27 Engine)
G04098195Courtesy of SUZUKI OF AMERICA CORP.