DTC P0021 INTAKE CAMSHAFT POSITION - TIMING OVER-ADVANCED OR SYSTEM PERFORMANCE (BANK 2) - H4DOTC

DTC DETECTING CONDITION:
• Two consecutive driving cycles with fault
• GENERAL DESCRIPTION

TROUBLE SYMPTOM:
• Engine stalls.
• Improper idling

STEP 1:
CHECK CURRENT DATA.
1) Start the engine and let it idle.
2) Inspect the output of AVCS advance angle and oil flow control solenoid valve duty.

CHECK:
Is AVCS advance approximately 0 degrees, and the oil flow control solenoid valve duty output approx. 10%?

IF "YES":
Check the following item and repair or replace if necessary.
• Engine oil (amount, dirt)
• Oil pipe (clog)
• Oil flow control solenoid valve (clog or dirt of oil routing, setting of spring, clog of valve)
• Intake camshaft (dirt, damage of camshaft)
• Timing belt (matching of timing mark)

IF "NO":
A temporary malfunction. Perform the following, 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.