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

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Tables and Graphs

CHT Sensor Temperature/Voltage Chart (Part 1 0f 2):

Part 2 Of 2:

Voltage values were calculated for Reference Voltage (VREF) = 5.0 volts. These values may vary 15 percent due to sensor and VREF variations.

Cylinder head temperature must be greater than 49°C (120°F) to pass the KOEO Self-Test and greater than 115°C (240°F) to pass the KOER Self-Test. To accomplish this, the engine should be at normal operating temperature.