Operation CHARM: Car repair manuals for everyone.
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

Or, hide this message: temporarily or permanently

Oscilloscope Patterns and Waveforms

Step 1:




Fuel injection signals

PCM terminals
- Fuel Injection No.1: 2BB (+)-Negative battery terminal (-)
- Fuel Injection No.2: 2BC (+)-Negative battery terminal (-)
- Fuel Injection No.3: 2BD (+)-Negative battery terminal (-)
- Fuel Injection No.4: 2AZ (+)-Negative battery terminal (-)

Oscilloscope setting
- 10 V/DIV (Y), 10 ms/DIV (X), DC range Vehicle condition
- Idle after warm-up