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)

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Oscilloscope Patterns and Waveforms

CMP sensor signal (+)




- PCM terminals (+)
- CMP sensor (left bank): 2AA (+)-body ground (-)
- CMP sensor (right bank): 2AD (+)-body ground(-)

- Oscilloscope setting: 1 V/DIV (Y), 20 minutes/DIV (X), DC range
- Vehicle condition: Idle after warm up (no load)


CMP sensor signal (-)




- PCM terminals
- CMP sensor (left bank): 2AB (+)-body ground (-)
- CMP sensor (right bank): 2AE (+)-body ground (-)

- Oscilloscope setting: 1 V/DIV (Y), 20 minutes/DIV (X), DC range
- Vehicle condition: Idle after warm up (no load)