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)

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No CCD Message From TCM

Name of Code:
No CCD Messages From TCM

When Monitored:
With the engine running.

Set Condition:
No CCD messages are received from the TCM for 10 seconds.

Theory of Operation:
The PCM and TCM communicate across the CCD bus system. Information is needed from either module to operate their respective systems.

Possible Causes:
- Open COD bus (+) or (-) circuit between the modules
- TCM not powered up
- Failed TCM
- Failed PCM