Engine - CVVT Oil Control Valve Inspection
Group ENGINENumber 09-EM-002
Date MAY, 2009
Model MULTIPLE MODELS (SEE BELOW)
Subject
CVVT OIL CONTROL VALVE INSPECTION
DESCRIPTION:
When diagnosing the Continuously Variable Valve Timing (CVVT) system for rough idling, poor acceleration, camshaft timing misalignment-related trouble codes, misfire related trouble codes, and/or other related symptoms, it may be required to inspect the Oil Control Valve (OCV) for proper operation. Follow the procedure outlined in this bulletin to inspect the OCV. If the OCV operates normally, then carry out other necessary repairs. Do not replace the OCV if normal operation is confirmed.
APPLICABLE VEHICLES:
^ Model: Hyundai vehicles equipped with CVVT systems
RELEVANT DIAGNOSTIC TROUBLE CODES (DTC)
INSPECTION FLOW DIAGRAM
OCV COIL RESISTANCE SPECIFICATION
OCV INSPECTION PROCEDURE:
1. Measure the resistance between the OCV Power and Signal terminals.
2. Check if the OCV operates normally by providing 12V power as shown in the picture above.
IMPORTANT:
Careful attention is necessary to avoid a short circuit when providing the OCV with 12V power. Spacing between the OCV power and signal terminals is very narrow. Use suitable connections to prevent shorting of the test power supply.
3. When 12V power is provided to the OCV, the OCV must move forward as shown in the picture shown above.
A: Maximum retarded valve timing condition (12V not provided)
B: Maximum advanced valve timing condition (12V provided)
NOTE:
Reverse the connection polarity if the movement is opposite.
4. If the OCV does not move forward, examine if a foreign object like an aluminum chip (C) is jammed inside the OCV.
^ Blow out the foreign object using compressed air, reinstall the OCV and then verify that the fault is corrected.
^ If there is no damage to the OCV, then do not replace the OCV.
WARRANTY INFORMATION:
Normal warranty applies, if applicable.