Mazda 3 Workshop Manual page 538

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
2. Connect the WDS or equivalent to the DLC-2.
3. Idle the engine.
4. Access VT DUTY1 PID.
5. Set the OCV duty valve to 100% and verify that the engine idles roughly or stalls.
• If as specified, inspect the timing belt component (valve timing deviation).
• If not as specified, go to the next step.
6. Remove the OCV and connect the OCV connector to the OCV.
7. Turn the ignition switch to the ON position.
8. Access VT DUTY1 PID.
9. Set the OCV duty value to 100% and verify that the spool valve operates in the advance direction.
10. If not as specified, inspect the following.
• OCV operation.
• Wiring harness and connectors between the OCV and the PCM for open or short circuit.
11. Inspect the following hydraulic passages for clogging and/or leakage.
• Oil pressure switch-OCV
• OCV-camshaft
• Camshaft internal passage
12. If they are normal, replace the intake camshaft pulley (with a built-in variable valve timing actuator).
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