DTC P0021 Intake Camshaft Position - Timing Over-Advanced Or System Performance (Bank 2): Trouble Symptom

CAUTION: After servicing or replacing faulty parts, perform Clear Memory Mode and Inspection Mode. Refer to OPERATION and PROCEDURE .

DIAGNOSTIC PROCEDURE

Step	Check	Yes	No
1 CHECK CURRENT DATA. Start the engine and let it idle. Read the value of «VVT Adv. Ang. Amount L» using the Subaru Select Monitor. NOTE: For detailed operation procedures, refer to "READ CURRENT DATA FOR ENGINE". Refer to SUBARU SELECT MONITOR .	Is the value of «VVT Adv. Ang. Amount L» approx. 0 deg?	Go to step 2 .	Check the following item and repair or replace if necessary. Intake cam sprocket (clog or dirt of oil routing, setting of spring) Intake camshaft (dirt, damage of camshaft)
2 CHECK CURRENT DATA. Drive with acceleration and deceleration at 80 km/h (50 MPH) or less. NOTE: Drive to an extent that the duty output of oil flow control solenoid valve increases. Read the values of «OCV Duty L» and «VVT Adv. Ang. Amount L» using the Subaru Select Monitor. NOTE: For detailed operation procedures, refer to "READ CURRENT DATA FOR ENGINE". Refer to SUBARU SELECT MONITOR .	When the value of «OCV Duty L» increases more than 10%, is the value of «VVT Adv. Ang. Amount L» approx. 0 deg?	Check the following item and repair or replace if necessary. Intake cam sprocket (clog or dirt of oil routing, setting of spring) Intake camshaft (dirt, damage of camshaft)	Perform the following procedures, and clean the oil routing. Replace the engine oil and idle the engine for 5 minutes, and then replace the oil filter and engine oil. Refer to REPLACEMENT and ENGINE OIL FILTER .