Diagnostic procedure

WARNING: This page is about a different car, the 2009 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

STEP	INSPECTION		ACTION
1	VERIFY FREEZE FRAME DATA HAS BEEN RECORDED Has FREEZE FRAME DATA been recorded?	Yes	Go to the next step.
1		No	Record FREEZE FRAME DATA on the repair order, then go to next step.
2	VERIFY RELATED REPAIR INFORMATION AVAILABILITY Verify related Service Bulletins availability. Is any related Service Bulletins available?	Yes	Perform repair or diagnosis according to available Service Bulletins. If vehicle is not repaired, go to next step.
2		No	Go to the next step.
3	EXHAUST TEMPERATURE OUT OF RANGE NOTE: Address all other DTCs before proceeding Switch the ignition ON (Engine running) Verify that the engine is at normal operating temperature Access the PCM and monitor the HO2S heater PID Is the PID state ON?	Yes	Perform the KOER self-test, then go to the next step. (See KOEO/KOER SELF TEST [MZI-3.7] )
3		No	Run the engine until the PID indicates ON Perform the KOER self-test, then go to the next step (See KOEO/KOER SELF TEST [MZI-3.7] )
4	VERIFY TROUBLESHOOTING OF DTC P1127:00 HAS BEEN COMPLETED Verify that all disconnected connectors reconnected Clear DTC from memory using M-MDS Start engine Perform "KOEO/KOER self-test" (See KOEO/KOER SELF TEST [MZI-3.7] ) Is same DTC present?	Yes	Replace PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [MZI-3.7] .)
4		No	Go to the next step.
5	VERIFY AFTER REPAIR PROCEDURE Perform "AFTER REPAIR PROCEDURE" (See AFTER REPAIR PROCEDURE [MZI-3.7] .) Are any DTC present?	Yes	Go to the applicable DTC inspection (See DTC TABLE [MZI-3.7] )
5		No	Troubleshooting completed