CHECK OTHER DTC OUTPUT (IN ADDITION TO DTC P0011, P0012, P0021 OR P0022)
PERFORM ACTIVE TEST (OPERATE OCV)
CHECK WHETHER DTC OUTPUT RECURS (DTC P0011, P0012, P0021 OR P0022)
CHECK VALVE TIMING (CHECK FOR LOOSE AND JUMPED TOOTH ON TIMING CHAIN)
INSPECT CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY (OCV)