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Home >> Subaru >> 2017 >> WRX Base >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System (Diagnostics) (P000A To P015B) (2.0L) >> Diagnostic Procedure with Diagnostic Trouble Code (DTC) >> DTC P0021 "A" Camshaft Position - Timing Over-Advanced Or System Performance Bank 2 >> Notes

DTC P0021 "A" Camshaft Position - Timing Over-Advanced Or System Performance Bank 2: Notes

DTC DETECTING CONDITION: 

Detected when two consecutive driving cycles with fault occur.

TROUBLE SYMPTOM: 

CAUTION: After servicing or replacing faulty parts, perform Clear Memory Mode <Ref. to OPERATION , Clear Memory Mode.>, and Inspection Mode <Ref. to PROCEDURE , Inspection Mode.>.
Step Check Yes No
1 IDENTIFYING FAULTY PART. 
  1. Perform the Clear Memory Mode. <Ref. to Clear Memory Mode .>
  2. Replace the defective oil control solenoid by the other (RH or LH, intake side or exhaust side) oil control solenoid.
  3. Perform appropriate drive cycle. <Ref. to Drive Cycle .>
  4. Make sure that the fault occurrence (DTC and incorrect advancing) has shifted to the other location.
 Did the detected DTC shift to the location where the oil control solenoid was replaced? Replace the faulty oil control solenoid. Go to step 2  .
2 CHECK CURRENT DATA. 
  1. Start the engine and let it idle.
  2. 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". <Ref. to Subaru Select Monitor .>
 Is the value of «VVT Adv. Ang. Amount L» approx. 0 deg? Go to step 3  . 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)
3 CHECK CURRENT DATA. 
  1. 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.
  2. 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". <Ref. 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. <Ref. to REPLACEMENT , Engine Oil.> <Ref. to Engine Oil Filter .>
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