If simulation function of WDS or equivalent is used:

Warm up the engine to normal operating temperature.
Connect the WDS or equivalent to DLC-2.
Start the engine and run it at idle.
Select VT DUTY1 PID.
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.
Remove the oil control valve (OCV) with connector is connected.
Turn the ignition switch to the ON position.
Select VT DUTY1 PID.
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 (Oil control valve (OCV)-PCM terminal 2E)
If they are okay, replace the intake camshaft pulley (with a built-in variable valve timing actuator).