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 the next step
2	VERIFY RELATED REPAIR INFORMATION AVAILABILITY Verify related Service Bulletins and/or on-line repair information availability Is any related Service Bulletins available?	Yes	Perform repair or diagnosis according to the available Service Bulletins. If the vehicle is not repaired, go to the next step.
2		No	Go to the next step
3	VERIFY TIMING CHAIN INSTALLATION Stop the engine Remove the front cover Is the camshaft timing mark at the correct point? (See TIMING CHAIN REMOVAL/INSTALLATION [MZI-3.7] .)	Yes	Go to the next step.
3		No	Reinstall the timing chain, then go to Step 5.
4	INSPECT OCV (LH) Inspect the OCV (LH) (See OIL CONTROL VALVE (OCV) INSPECTION [MZI-3.7] .) Is there any malfunction?	Yes	Replace the OCV (LH), then go to the next step. (See OIL CONTROL VALVE (OCV) REMOVAL/INSTALLATION [MZI-3.7] .)
4		No	Go to the next step.
5	VERIFY TROUBLESHOOTING OF DTC P0021:00 HAS BEEN COMPLETED Make sure to reconnect all disconnected connectors Clear the DTC from the PCM memory using the M-MDS Switch the ignition to off Start the engine and warm it up completely Is the same DTC present?	Yes	Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [MZI-3.7] .)
5		No	Go to the next step
6	VERIFY AFTER REPAIR PROCEDURE Perform the "AFTER REPAIR PROCEDURE" (See AFTER REPAIR PROCEDURE [MZI-3.7] ) Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [MZI-3.7] .)
6		No	Troubleshooting completed.