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
Communications to PCM
COMMUNICATIONS TO PCM The
PCM is continuously sending Bus Messages to the
TCM. The TCM requires inputs from the PCM primarily to determine the Vehicle speed, Engine RPM, and the Park/Neutral switch state.
The
PCM also monitors the COD bus messages from the
TCM. A Diagnostic code is set if the TCM does not receive any valid messages from the PCM for 20 seconds.