Malfunction Indicator Light

Using jumper wire, ground (Green) 1-pin connector. Connector is located above right side front wheelwell. See Fig 1 .
With ignition on and engine stopped, observe CHECK ENGINE or MIL light. Note trouble codes. Check TROUBLE CODE IDENTIFICATION table for possible cause. If light remains on continuously, MIL light circuit is grounded or ECU is defective. If CHECK ENGINE or MIL light light is not flashing, no codes stored.

Fig 1: Grounding (Green) 1-Pin Connector

Courtesy of MAZDA MOTORS CORP.

NOTE: In addition to displaying computer system malfunction codes (codes only on California models), the CHECK light acts as an emission maintenance warning.