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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Data Link Connector: Testing and Inspection

Check Connector:






The Test Connector is a green, one pin connector located in the engine compartment. When grounded, the test connector activates the self-diagnostic system and causes the dash mounted "CHECK" light to flash malfunction codes.

Test connector signal can be checked at ECU terminal 1I, ignition switch "ON." With test connector grounded, terminal voltage should be below 1.5V. With connector not grounded, voltage should be above 10.5V. If not as specified, check wiring between test connector and ECU.