Variable Valve Timing Control System Operation Inspection

When idling cannot be continued

Remove the OCV and verify that the spool valve is at maximum retard position. (See OIL CONTROL VALVE (OCV) REMOVAL/INSTALLATION .)
If the spool valve is stuck in advance direction, replace the OCV. (See OIL CONTROL VALVE (OCV) REMOVAL/INSTALLATION .)
Connect the OCV connector.
Switch the ignition to ON.
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 wiring harnesses or connectors between OCV terminal B and PCM terminal 2W
Inspect the variable valve timing actuator. (See VARIABLE VALVE TIMING ACTUATOR INSPECTION .)

When idling can be continued

Warm-up the engine.
Connect the M-MDS to the DLC-2.
Idle the engine.
Access the VT Duty1 wt PID. (See ON-BOARD DIAGNOSTIC TEST .)
Set the OCV duty valve to 100% 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 OCV and connect the OCV connector to the OCV. (See OIL CONTROL VALVE (OCV) REMOVAL/INSTALLATION .)
Switch the ignition to ON.
Access the VT Duty1 wt PID. (See ON-BOARD DIAGNOSTIC TEST .)
Set the OCV duty value to 100% and verify that the spool valve operates in the advance direction.
If not as specified, inspect the following:
- OCV operation (See OIL CONTROL VALVE (OCV) REMOVAL/INSTALLATION .)
- Wiring harness and connectors between OCV terminal A and PCM terminal 2I for open or short circuit
- Wiring harness and connectors between OCV terminal B and PCM terminal 2W for open or short circuit
Inspect the following hydraulic passages for restriction and/or leakage:
- Oil pressure switch-OCV
- OCV-camshaft
- Camshaft internal passage
If they are normal, replace the intake camshaft pulley (with a built-in variable valve timing actuator). (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION .)