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

Electrical Specifications

HEATER ELEMENT RESISTANCE
Hot to warm 5.0-30.0 ohms
Room temperature 2.0-5.0 ohms

HO2S SWITCHING
HO2S signal 0.3-0.9 volts within 3 seconds
After driving 55 mph for 5 minutes.