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

Information Bus: Testing and Inspection

ECM Data Line

1. If all components are not accessible with a scan tool, check for an open in the ORN (461) wire between ALDL connector, terminal M and S144.
2. If a single component is not accessible with a scan tool, check for an open in the ORN (461) wire between S144 and the component. If the wire is OK, refer to Electronic Control Module diagnosis and/or ABS diagnosis.