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. (See OIL CONTROL VALVE (OCV) REMOVAL/INSTALLATION .)
2. Connect the OCV.
3. Switch the ignition to ON.
4. Verify that the spool valve is at the 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 the OCV and the PCM
5. Inspect the variable timing actuator.

When idling can be continued 

If simulation function of M-MDS is used: 

1. Warm up the engine to normal operating temperature.
2. Verify that the DTC P2088:00 or P2089:00 are shown. (See ON-BOARD DIAGNOSTIC TEST .)
   • If the DTC P2088:00 or P2089:00 are shown, perform the DTC inspection. (See DTC P2088:00 .) (See DTC P2089:00 .)
3. Start the engine and run it is idling.
4. Access the VT DUTY1 PID using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST .)
5. Increase the 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.
6. Remove the OCV while the connector is connected. (See OIL CONTROL VALVE (OCV) REMOVAL/INSTALLATION .)
7. Switch the ignition to ON (engine off).
8. Access the VT DUTY1 PID using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST .)
9. Increase the 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-OCV
     • OCV-Camshaft
     • Camshaft internal passage
   • If not as specified, inspect the following:
     • OCV operation (See OIL CONTROL VALVE (OCV) INSPECTION .)
10. If they are normal, replace the intake camshaft pulley (with a built-in variable valve timing actuator). (See VARIABLE VALVE TIMING ACTUATOR REMOVAL/INSTALLATION .)

If simulation function of M-MDS is not used: 

1. Disconnect the OCV connector.
2. Verify that the DTC P2088:00 or P2089:00 are shown. (See ON-BOARD DIAGNOSTIC TEST .)
   • If the DTC P2088:00 or P2089:00 are shown, perform the DTC inspection. (See DTC P2088:00 .) (See DTC P2089:00 .)
3. Warm up the engine and idle it.
4. Apply 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 stalls, go to the next step.
5. Remove the OCV and perform the spool valve operation inspection. (See OIL CONTROL VALVE (OCV) REMOVAL/INSTALLATION .)
   • If not as specified, inspect the following:
     • OCV (See OIL CONTROL VALVE (OCV) INSPECTION .)
     • Harnesses and connectors between OCV and PCM have an open or short circuit.
   • If as specified, inspect the following hydraulic passages for clogging or leakage or both:
     • Oil pressure switch-OCV
     • OCV-Camshaft
     • Camshaft internal passage
6. If they are normal, replace the camshaft pulley (with built-in variable valve timing actuator). (See VARIABLE VALVE TIMING ACTUATOR REMOVAL/INSTALLATION .)