Data Link Connector: Description and Operation

Check Connector:

^ The Test Connector is a green, one pin connector located on the left side of the engine compartment.
^ When grounded, test connector activates the self-diagnostic system, causing the malfunction indicator lamp (MIL) to flash any codes stored in ECU memory.
^ Grounding the test connector is necessary to read malfunction codes with the Mazda Self-Diagnosis Checker or other compatible "Scan" tool.
^ Test connector is also grounded when making idle speed and ignition timing adjustments.

NOTE: The ECU continuously checks for input device malfunctions, but only checks output devices during the three second period after the ignition is switched "ON" with the test connector grounded. If malfunction codes are present, the lowest numbered code will be displayed first, followed by any others in numerical order.