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 logical successor to CHARM, I recommend you try it!

Link: lemon-manuals.la

California Emission Regulation Applicable ATX Model

Inspection Using An Oscilloscope (Reference) (California emission regulation applicable ATX model)

VSS out signal




- PCM terminals: 70(+) - 26(-)
- Oscilloscope setting: 500 mV/DIV (Y), 10 ms/DIV (X), DC range
- Vehicle condition: Idle after warm up (no load)