April 5, 2026: LEMON Manuals is launched! Read the announcement.

Fuel injection signal

PCM terminal
- No.1: 76(+)-100 (-)
- No.2: 50(+)-100 (-)
- No.3: 75(+)-100 (-)
- No.4: 49(+)-100 (-)
- No.5: 74(+)-100 (-)
- No.6: 48(+)-100 (-)
Oscilloscope setting: 2V/DIV (Y), 10ms/DIV (X), DC range
Vehicle condition: idle after warm up

Fig 1: Identifying Oscilloscope Graph Fuel Injection Signal
Courtesy of MAZDA MOTORS CORP.