Hydraulic Variable Valve Timing Control System Operation Inspection

When idling cannot be continued

1. Connect the M-MDS to the DLC-2 and verify that DTC P2090:00 or P2091:00 is displayed. (See ON-BOARD DIAGNOSTIC TEST .)
   • Perform the DTC inspection. (See DTC P2090:00 [SKYACTIV-G 2.0] .) (See DTC P2091:00 [SKYACTIV-G 2.0] .)
2. Remove the OCV and verify that the spool valve is at maximum advanced position. (See OIL CONTROL VALVE (OCV) REMOVAL/INSTALLATION .)
3. Connect the OCV connector.
4. Switch the ignition ON (engine off).
5. Verify that the spool valve is at the maximum advanced position.
   • If the spool valve is stuck in the retard direction, inspect for the following:
     • Short circuit in wiring harnesses or connectors between OCV and PCM
6. Inspect the hydraulic variable valve timing actuator. (See HYDRAULIC VARIABLE VALVE TIMING ACTUATOR INSPECTION .)

When idling can be continued

If simulation function of M-MDS is used:

1. Warm up the engine to normal operating temperature.
2. Connect the M-MDS to the DLC-2.
3. Verify that DTC P2090:00 or P2091:00 is displayed. (See ON-BOARD DIAGNOSTIC TEST .)
   • Perform the DTC inspection. (See DTC P2090:00 [SKYACTIV-G 2.0] .) (See DTC P2091:00 [SKYACTIV-G 2.0] .)
4. Start the engine and let it idle.
5. Access the simulation item VT_EX_DES using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST .)
6. Increase the OCV duty value and verify that the engine idles rough or stalls.
   • If the engine idles rough or stalls, inspect the timing chain component (valve timing deviation). (See HYDRAULIC VARIABLE VALVE TIMING ACTUATOR INSPECTION .)
   • If the engine does not idle rough or stalls, go to the next step.
7. Remove the OCV while the connector is connected. (See OIL CONTROL VALVE (OCV) REMOVAL/INSTALLATION .)
8. Switch the ignition ON (engine off).
9. Access the simulation item VT_EX_DES using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST .)
10. Increase the OCV duty value and verify that the spool valve operates in the retard direction.
    • If as specified, inspect the following hydraulic passage for restriction 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 .)
11. If they are normal, replace the hydraulic variable valve timing actuator. (See ELECTRIC VARIABLE VALVE TIMING ACTUATOR, HYDRAULIC VARIABLE VALVE TIMING ACTUATOR REMOVAL/INSTALLATION .)

If simulation function of M-MDS is not used:

1. Disconnect the OCV connector. (See OIL CONTROL VALVE (OCV) REMOVAL/INSTALLATION .)
2. Warm up the engine and idle it.
3. Apply the battery voltage to the OCV and verify that the engine idles rough or stalls.
   • If the engine idles rough or stalls, inspect the timing chain component (valve timing deviation). (See HYDRAULIC VARIABLE VALVE TIMING ACTUATOR INSPECTION .)
   • If the engine does not idle rough or stalls, go to the next step.
4. Remove the OCV and perform the Spool Valve Operation Inspection. (See OIL CONTROL VALVE (OCV) INSPECTION .)
   • 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 restriction or leakage or both:
     • Oil pressure switch-OCV
     • OCV-Camshaft
     • Camshaft internal passage
5. If they are normal, replace the hydraulic variable valve timing actuator. (See ELECTRIC VARIABLE VALVE TIMING ACTUATOR, HYDRAULIC VARIABLE VALVE TIMING ACTUATOR REMOVAL/INSTALLATION .)