Data Link Connector (DLC) & Self-Test Input (STI) Connector
The 6-pin Data Link Connector (DLC) is used to perform the Quick Test diagnostic procedure. The STI is a single-pin connector located next to the DLC. When the STI wire is connected to SIG RTN terminal of DLC, fault code output function is activated.
SELF-DIAGNOSTIC SYSTEM
Note. All systems have self-diagnostic capabilities. For information on procedures for entering self-test modes and reading service codes, see TESTS W/CODES - EEC-IV (2.0L) article in the ENGINE PERFORMANCE section.