RX7 2RTR-1308cc 1.3L MFI (1991)
Data Link Connector: Description and Operation
Grounding Test Connector Pin
The Test Connector is a green, one pin connector located on the left side of the engine compartment. When grounded, the test connector activates the
self-diagnostic system, causing the dash mounted 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. The 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.