For Left Bank

Disconnect OCV (LH) connector.
Warm up the engine to idle.
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.
Remove the OCV (LH) and perform spool valve operation inspection. (See OIL CONTROL VALVE (OCV) REMOVAL/INSTALLATION .)
- If not as specified, inspect the following:
  - OCV (LH) (See OIL CONTROL VALVE (OCV) INSPECTION .)
  - 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
If they are normal, replace the left bank camshaft pulley (with built-in variable valve timing actuator).