Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSMAZDA20066 I, 4D SEDAN, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMSYMPTOM TROUBLESHOOTING [ENGINE CONTROL SYSTEM L3)ENGINE CONTROL SYSTEM OPERATION INSPECTIONVARIABLE VALVE TIMING CONTROL SYSTEM OPERATION INSPECTIONWHEN IDLING CAN BE CONTINUED
2006 Mazda 6 i, 4D Sedan, Automatic
When idling can be continued
2006 Mazda 6 i, 4D Sedan, AutomaticSECTION When idling can be continued
- Disconnect oil control valve (OCV) connector.
- Warm up the engine and idle it.
- Apply battery voltage to the oil control valve (OCV) and verify that the engine idles roughly or stalls.
- If the engine idles roughly or stalls, inspect the timing chain component (valve timing deviation).
- If the engine does not idle roughly or stalls, go to the next step.
- Remove the oil control valve (OCV) and perform spool valve operation inspection.
(See OIL CONTROL VALVE (OCV) INSPECTION ).
- If not as specified, inspect the following:
- Oil control valve (OCV)
- Harnesses and connectors between oil control valve (OCV) and PCM open or short.
- If as specified, inspect the following hydraulic passages for clogging or leakage or both:
- Oil pressure switch - oil control valve (OCV)
- Oil control valve (OCV) - camshaft
- Camshaft internal passage
- If not as specified, inspect the following:
- If they are okay, replace the camshaft pulley (with built-in variable valve timing actuator).
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.