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

IGT1, IGT2, IGT3, IGT4 control signals




- PCM terminals
- IGT1 (No.1): 2BE (+)-body ground (-)
- IGT2 (No.2): 2BF (+)-body ground (-)
- IGT3 (No.3): 2BG (+)-body ground (-)
- IGT4 (No.4): 2BH (+)-body ground (-)

- Oscilloscope setting: 10 V/DIV (Y), 25 minutes/DIV (X), DC range
- Vehicle condition: Idle after warm up (engine speed approx. 650 rpm, no load)