Fuel Injection Control (-) Signal

WARNING: This page is about a different car, the 2018 Mazda CX-9. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Fuel Injection Control (-) Output Voltage Signal Graph

Courtesy of MAZDA MOTORS CORP.

PCM terminals

Fuel Injection No. 1: 1DO(+)-body ground(-)
Fuel Injection No. 2: 1DW(+)-body ground(-)
Fuel Injection No. 3: 1EA(+)-body ground(-)
Fuel Injection No. 4: 1DS(+)-body ground(-)
Oscilloscope setting
20 V/DIV (Y), 50 ms/DIV (X), DC range
Vehicle condition
Idle after warm up