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

Principle of Code Cycle


Trouble Codes Are Determined As Shown Below




1. Code Cycle Break
The time between trouble code cycles is 4.0 seconds (the time the buzzer is off).




2. Second Digit of Trouble Code (ones position)
The digit in the ones position of the trouble code represents the number of times the buzzer sounds 0.4 second during one cycle.




3. First Digit of Trouble Code (tens position)
The digit in the tens position of the trouble code represents the number of times the buzzer is on 1.2 seconds during one cycle.

The buzzer is off for 1.6 seconds between the long and short pulses.