Diagnostic procedure

WARNING: This page is about a different car, the 2005 Mazda RX-8. However, it is still accessible from the selected car via links, so may be relevant.

NO.2 MIL COMES ON DIAGNOSTIC PROCEDURE

STEP	INSPECTION	RESULTS	ACTION
1	Connect the WDS or equivalent to the DLC-2. Turn the ignition switch to the ON position (Engine off). Retrieve any DTCs. Are there any DTCs displayed?	Yes	Go to the applicable DTC inspection. (See DTC TABLE .)
1		No	Go to the next step.
2	Inspect between the following wiring harnesses. PCM terminal 4V-instrument cluster terminal 1J PCM terminal 4S-instrument cluster terminal 1L Are they normal?	Yes	Inspect instrument cluster operation. (See INSTRUMENT CLUSTER INPUT/OUTPUT CHECK MODE .)
2		No	Repair or the replace wiring harness.
3	Verify test results. If normal, return to the diagnostic index to service any additional symptoms. If the malfunction remains, inspect the related Service Bulletins and/or On-line Repair Information and perform the repair or diagnosis.