P0021
DTC P0021 IVT CONTROLSystem Description:
System Description
This mechanism hydraulically controls cam phases continuously with the fixed operating angle of the intake valve.
The ECM receives signals such as crankshaft position, camshaft position, engine speed, and engine coolant temperature. Then, the ECM sends ON/OFF pulse duty signals to the camshaft timing control valve depending on driving status. This makes it possible to control the shut/open timing of the intake valve to increase engine torque in low/mid speed range and output in high-speed range.
COMPONENT DESCRIPTION
Intake valve timing control solenoid valve is activated by ON/OFF pulse duty (ratio) signals from the ECM. The intake valve timing control solenoid valve changes the oil amount and direction of flow through intake valve timing control unit or stops oil flow.
The longer pulse width advantages valve angle.
The shorter pulse width retards valve angle.
When ON and OFF pulse widths become equal, the solenoid valve stops oil pressure flow to fix the intake valve angle at the control position.
Consult-II Reference Value In Data Monitor Mode:
On Board Diagnosis Logic:
Fail-Safe Mode:
DTC Confirmation Procedure
CAUTION: Always drive at a safe speed.
NOTE: If "DTC Confirmation Procedure" has been previously conducted, always turn ignition switch "OFF" and wait at least 10 seconds before conducting the next test.
TESTING CONDITION: Before performing the following procedure, confirm that battery voltage is between 10V and 16V at idle.
WITH CONSULT-II
1. Turn ignition switch ON .
2. Select DATA MONITOR mode with CONSULT-II.
3. Maintain the following conditions for at least 20 consecutive seconds.
4. If 1st trip DTC is detected, go to "Diagnostic Procedure" below.
WITH GST
Follow the procedure "WITH CONSULT-II" above.
EC-IVCB1-01:
EC-IVCB2-01:
Wiring Diagram
Diagnostic Procedure
Diagnostic Procedure Step 1 - 4:
Diagnostic Procedure Step 5 - 9:
Component Inspection
INTAKE VALVE TIMING CONTROL SOLENOID VALVE
1. Disconnect intake valve timing control solenoid valve harness connector.
2. Check resistance between intake valve timing control solenoid valve terminals.