Diagnostic procedure

WARNING: This page is about a different car, the 2005 Mazda MX-5 Miata. However, it is still accessible from the selected car via links, so may be relevant.

DTC P0012 [BP] DIAGNOSTIC PROCEDURE

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 repair order, then go to the next step.
2	VERIFY RELATED REPAIR INFORMATION AVAILABILITY Check for related Service Bulletins and/or online repair information availability. Is any related repair information available?	Yes	Perform repair or diagnosis according to the available repair information. If the vehicle is not repaired, go to the next step.
2		No	Go to the next step.
3	VERIFY RELATED PENDING CODE OR STORED DTCS Is DTC P0010 present?	Yes	Go to DTC P0010 troubleshooting procedure. (See DTC P0010 [BP] )
3		No	Go to the next step.
4	VERIFY ENGINE OIL PRESSURE Start engine. Does oil pressure warning light illuminate?	Yes	Inspect engine oil pressure. (See OIL PRESSURE INSPECTION )
4		No	Go to the next step.
5	VERIFY TIMING BELT INSTALLATION Stop engine. Remove timing belt cover. Is camshaft timing mark at correct point? (See TIMING BELT REMOVAL/INSTALLATION )	Yes	Go to the next step.
5		No	Reinstall timing belt, then go to Step 8.
6	INSPECT OCV (OIL CONTROL VALVE) FOR MALFUNCTION Stop engine. Remove the OCV (oil control valve). Check the position of spool valve in OCV (oil control valve). Is spool valve located at valve retard position?	Yes	VARIABLE VALVE TIMING MECHANISM IS NORMAL NOTE: This DTC detected by intermittent concern. Intermittent concern might be removed by cleaning mode of variable valve timing control function. Go to Step 8.
6		No	Replace OCV, then go to Step 8.
7	INSPECT ENGINE OIL RUNNER Inspect following engine oil runners for clogging or leakage. INSPECTION RUNNER Between oil pressure switch and OCV (oil control valve) Between OCV (oil control valve) and variable valve timing actuator In variable valve timing actuator Is there any clogging or leakage?	Yes	Repair or replace suspected malfunction.
7		No	VARIABLE VALVE TIMING MECHANISM IS NORMAL NOTE: This DTC is detected by intermittent concern. Intermittent concern might be removed by cleaning mode of variable valve timing control function. Go to Step 8.
8	VERIFY TROUBLESHOOTING OF DTC P0012 COMPLETED Make sure to connect all disconnected connectors. Start engine. Clear the DTC from the PCM memory using the WDS or equivalent. Start engine and warm it up completely. Is same DTC present?	Yes	Replace PCM, then go to the next step.
8		No	Go to the next step.
9	VERIFY AFTER REPAIR PROCEDURE Perform the "AFTER REPAIR PROCEDURE ". (See AFTER REPAIR PROCEDURE ) Is any DTC present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE )
9		No	Troubleshooting completed.