Operation CHARM: Car repair manuals for everyone.

Oscilloscope Patterns and Waveforms

Fuel injection signal








PCM terminals
- Fuel Injection No.1: 2BB (+)-body ground (-)
- Fuel Injection No.2: 2BC (+)-body ground (-)
- Fuel Injection No.3: 2BD (+)-body ground (-)

Oscilloscope setting
- 4V/DIV (Y), 20 ms/DIV (X), DC range
Vehicle condition
- Idle after warm up