Fuel injection control (+) signal

Courtesy of MAZDA MOTORS CORP.

PCM terminals 

• Fuel Injection No. 1: 1DP (+)-body ground (-)
• Fuel Injection No. 2: 1DX (+)-body ground (-)
• Fuel Injection No. 3: 1EB (+)-body ground (-)
• Fuel Injection No. 4: 1DT (+)-body ground (-)

Oscilloscope setting 

• 20 V/DIV (Y), 50 ms/DIV (X), DC range

Vehicle condition 

• Idle after warm up