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)

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Possible Causes of Fault



Possible Causes Of Fault

NOTE: The 'possible causes of fault' that are responsible for the fault are listed here. Please note that in certain circumstances further faults can be stored in the fault memory after troubleshooting (e.g. if plugs are disconnected). After carrying out repairs, read out the fault memory of all control modules and erase any faults.

Causes of CAN faults:
- No or incorrect basic setting/adaption (control module)
- Short circuit to B+ (CAN lead) Short circuit to ground (CAN lead)
- Short circuit with respect to each other (CAN lead)
- Open circuit (CAN lead)
- High' and 'low' confused (slot in connector, or wires separated and repaired incorrectly)