Variable Valve Timing Control System Operation Inspection: Notes

When idling cannot be continued 

1. Remove the oil control valve (OCV) and verify that the spool valve is at maximum retard position.
2. Connect the oil control valve (OCV).
3. Turn the ignition switch to the ON position.
4. Verify that the spool valve is at the maximum retard position.
   • If the spool valve is stuck in the advance direction, inspect for the following:
     • Short circuit in wiring harnesses or connectors between the oil control valve (OCV) and the PCM.
5. Inspect the variable timing actuator.

When idling can be continued 

If simulation function of M-MDS is used: 

1. Warm up the engine to normal operating temperature.
2. Connect the M-MDS to the DLC-2.
3. Start the engine and run it is idling.
4. Select the VT DUTY1 PID.
5. Increase the oil control valve (OCV) duty value 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 oil control valve (OCV) while the connector is connected.
7. Turn the ignition switch to the ON position.
8. Select VT DUTY1 PID.
9. Increase the oil control valve (OCV) duty value and verify that the spool valve operates in the advance direction.
   • If as specified, inspect the following hydraulic passage for clogging and/or leakage.
     • Oil pressure switch - oil control valve (OCV)
     • Oil control valve (OCV) - camshaft
     • Camshaft internal passage
   • If not as specified, inspect the following:
     • Oil control valve (OCV) operation
     • Harness and connectors for open or short circuit (Oil control valve (OCV) - PCM terminal 4S)
10. If they are normal, replace the intake camshaft pulley (with a built-in variable valve timing actuator).

    If simulation function of M-MDS is not used: 

11. Disconnect the oil control valve (OCV) connector.
12. Warm up the engine and idle it.
13. 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 belt component (valve timing deviation).
    • If the engine does not idle roughly or stalls, go to the next step.
14. Remove the oil control valve (OCV) and perform the 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 have an open or short circuit.
    • 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
15. If they are normal, replace the camshaft pulley (with built-in variable valve timing actuator).