Variable Valve Timing Control System Operation Inspection When Idling Cannot Be Continued

Variable Valve Timing Control System Operation Inspection

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 ON position.
4. Verify that the spool valve is at maximum retard position.
- If the spool valve is stuck in the advance direction, inspect for the following:
- Short circuit in harnesses or connectors between the oil control valve (OCV) and the PCM.

5. Inspect the variable timing actuator.

When idling can be continued
1. Disconnect oil control valve (OCV) connector.
2. Warm up the engine and idle it.
3. 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.

4. Remove the oil control valve (OCV) and perform spool valve operation inspection. (See OIL CONTROL VALVE (OCV) INSPECTION [L3].)
- 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

5. If they are okay, replace the camshaft pulley (with built-in variable valve timing actuator).