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Home >> Subaru >> 2017 >> Forester 2.0XT Touring >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 16 (Engine Control System (Diagnostics) (P000A To P015B) (H4DO)) >> 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

WARNING: This page is about a different variant/trim than selected.

DTC detecting condition: 

Detected when two consecutive driving cycles with fault occur.

Trouble symptom: 

CAUTION: After servicing or replacing faulty parts, perform Clear Memory Ref. to ENGINE (DIAGNOSTICS) (H4DO)>Clear Memory Mode>OPERATION . and Inspection Mode Ref. to ENGINE (DIAGNOSTICS) (H4DO)>Inspection Mode>PROCEDURE .
  1. IDENTIFYING FAULTY PART. 
    1. Clear the memory. Ref. to ENGINE (DIAGNOSTICS) (H4DO)>Clear Memory Mode .
    2. Replace the defective oil control solenoid by the other (RH or LH, intake side or exhaust side) oil control solenoid. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>Oil Control Solenoid .
    3. Perform appropriate drive cycle test.
    4. Check 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?

  2. CHECK CURRENT DATA. 
    1. Start the engine and let it idle.
    2. Using the Subaru Select Monitor, read the value in [VVT Adv. Ang. Amount L].
    NOTE: For detailed procedures, refer to "Data Monitor". Ref. to ENGINE (DIAGNOSTICS) (H4DO)>Subaru Select Monitor .

    Is the value of [VVT Adv. Ang. Amount L] approx. 0 deg?

    • Yes: Go to  3.
    • No: 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. Using the Subaru Select Monitor, read the values in [OCV Duty L] and [VVT Adv. Ang. Amount L].
    NOTE: For detailed procedures, refer to "Data Monitor". Ref. to ENGINE (DIAGNOSTICS) (H4DO)>Subaru Select Monitor .

    When the value of [OCV Duty L] increases from 10%, is the value of [VVT Adv. Ang. Amount L] approx. 0 deg?

    • Yes: 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)
    • No: 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 LUBRICATION(H4DO)>Engine Oil>REPLACEMENT . Ref. to LUBRICATION(H4DO)>Engine Oil Filter .

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