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LEMON is the spiritual successor to CHARM, I recommend you try it!
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Central Timer Module Diagnostic Trouble Codes
The
Central Timer Module (CTM)'s Diagnostic Trouble Codes
(DTCs) are 2 digits in length and are output to the operator by the sounding of the chime.
The first digit is output, followed by a one second pause, followed by the next digit. Each digit is made up of
1 to 9 one-second individual chime tones. The illustration represents the output of the DTC 21.
