No. 2 - Check Engine Light Illuminates: Notes

2	CHECK ENGINE LIGHT ILLUMINATES
DESCRIPTION	Check engine light illuminates incorrectly. NOTE: If there is a malfunction in the engine system, the PCM stores a DTC and illuminates the check engine light.
POSSIBLE CAUSE	Check engine light illuminates for emission-related concern (DTC is stored in PCM) Short to ground in wiring harness between the following terminals: Instrument cluster terminal B-BCM terminal 2D Instrument cluster terminal D-BCM terminal 2C BCM terminal 3C-PCM terminal 2S BCM terminal 3D-PCM terminal 2T Open circuit in wiring harness between the following terminals: Instrument cluster terminal B-BCM terminal 2D Instrument cluster terminal D-BCM terminal 2C BCM terminal 3C-PCM terminal 2S BCM terminal 3D-PCM terminal 2T Instrument cluster malfunction
Courtesy of MAZDA MOTORS CORP.