Variable Valve Timing Control System Operation Inspection

When idling cannot be continued 

1. Remove the OCV and verify that the spool valve is at maximum retard position.
   • If the spool valve is stuck in advance direction, replace the OCV. (See OIL CONTROL VALVE (OCV) REMOVAL/INSTALLATION article.)
2. Connect the OCV.
3. Turn the ignition switch to ON position.
4. Verify that the spool valve is at max. retard position.
   • If the spool valve is stuck in advance direction, inspect the following:
     • Short circuit in harnesses or connectors between the OCV and the PCM.
5. Inspect the variable valve timing actuator.

When idling can be continued 

For right bank 

1. Disconnect OCV (RH) connector.
2. Warm up the engine and it at idle.
3. Apply the battery voltage to the 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 stall, go to the next step.
4. Remove the OCV (RH) and perform spool valve operation inspection. (See OIL CONTROL VALVE (OCV) REMOVAL/INSTALLATION article.)
   • If not as specified, inspect the following:
     • OCV (RH) (See OIL CONTROL VALVE (OCV) INSPECTION article.)
     • Harnesses and connectors between OCV (RH) and PCM have an open or short circuit.
   • If as specified, inspect the following right bank hydraulic passages for clogging or leakage, or both.
     • Oil pressure switch - OCV
     • OCV - camshaft
     • Camshaft internal passage
5. If they are normal, replace the right bank camshaft pulley (with built-in variable valve timing actuator).

When idling can be continued 

For left bank 

1. Disconnect OCV (LH) connector.
2. Warm up the engine to idle.
3. Apply the battery voltage to the 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 stall, go to the next step.
4. Remove the OCV (LH) and perform spool valve operation inspection. (See OIL CONTROL VALVE (OCV) REMOVAL/INSTALLATION article.)
   • If not as specified, inspect the following:
     • OCV (LH) (See OIL CONTROL VALVE (OCV) INSPECTION article.)
     • Harnesses and connectors between OCV (LH) and PCM have an open or short circuit.
   • If as specified, inspect the following left bank hydraulic passages for clogging or leakage or both.
     • Oil pressure switch - OCV
     • OCV - camshaft
     • Camshaft internal passage
5. If they are normal, replace the left bank camshaft pulley (with built-in variable valve timing actuator).