Data Link Connector: Description and Operation

DESCRIPTION
The Data Link Connector is used to trigger the self diagnostic capabilities of the Engine Control Module (ECM) as well as allow tachometer hookup and other selected functions.

OPERATION
By connecting the Data Link Connector terminals as described in several test procedures shown later it is possible to control fuel pump operation, access the ignition signal for tachometer hookup, and several other functions including access of any Data Trouble Codes stored in the Engine Control Module. The vehicles ECM uses Variable Pulse Width for communication to comply with SAE J 1850. The terminal arrangemant of Data Link Connector 3 complies with SAE J 1962 and matches the Variable Pulse Width format.






Data Link Connector 3 terminal view.

DLC3 Terminal Description:

Data Link Connector 3 terminal ID.