P0021
3UZ-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0011: Camshaft Position "A" - Timing Over-Advanced or System Performance (Bank 1)
DTC P0011 - Camshaft Position "A" - Timing Over-Advanced or System Performance (Bank 1)
DTC P0012 - Camshaft Position "A" - Timing Over-Retarded (Bank 1)
DTC P0021 - Camshaft Position "A" - Timing Over-Advanced or System Performance (Bank 2)
DTC P0022 - Camshaft Position "A" - Timing Over-Retarded (Bank 2)
DESCRIPTION
The Variable Valve Timing (VVT) system controls the intake camshaft to provide the optimal valve timing for every driving condition. This control is performed based on signals regarding as intake air volume, throttle position and engine coolant temperature.
The ECM controls the Oil Control Valve (OCV) based on the signals output from several sensors. The VVT controller regulates the intake camshaft angle using oil pressure through the OCV. As a result, the relative position between the camshaft and the crankshaft becomes optimal, and the engine torque improves, fuel economy improves, and exhaust emissions decrease under overall driving conditions. Also, the ECM detects the actual valve timing using the signals from the camshaft position sensor and the crankshaft position sensor, and performs feedback control. This is how target valve timing is achieved by the ECM.
MONITOR DESCRIPTION
The ECM optimizes the intake valve timing using the VVT (Variable Valve Timing) system to control the intake camshaft. The VVT system includes the ECM, Oil Control Valve (OCV) and VVT controller. The ECM sends a target duty-cycle control signal to the OCV. This control signal regulates the oil pressure supplied to the VVT controller. The VVT controller can advance or retard the intake camshaft.
If the difference between the target and actual intake valve timings is large, and changes in the actual intake valve timing are small, the ECM interprets this as the VVT controller stuck malfunction and store a DTC.
Example:
A DTC is stored when the following conditions 1 and 2 are met for 10 seconds or more:
1 The difference between the target and actual intake valve timing is more than 5°CA (Crankshaft Angle) and the condition continues for more than 5 seconds.
2 It takes 5 seconds or more to change the valve timing by 5°CA.
Advanced cam DTCs are subject to 1 trip detection logic.
Retarded cam DTCs are subject to 2 trip detection logic.
The monitor runs if all the conditions below are met:
- The engine is warmed up (engine coolant temperature is 75°C (167°F) or more).
- The vehicle is driven over 40 km/h (25 mph) for 3 minutes.
- The engine is idled for 3 minutes.
MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
TYPICAL MALFUNCTION THRESHOLDS
If the difference between target and actual camshaft timing is larger than the specified value, the ECM operates the VVT actuator.
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
- Read freeze frame data using the Techstream. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.
- If DTC P0011 or P0012 is displayed, check the bank 1 VVT system circuit.
- If DTC P0021 or P0022 is displayed, check the bank 2 VVT system circuit.
- Bank 1 includes No. 1 cylinder, but bank 2 does not. The No. 1 cylinder is located in the front part of the engine, opposite the transmission.
NOTE:
DTCs P0011, P0012, P0021 or P0022 is output when a foreign object in the engine oil enters the system. These codes will stay set even if the system returns to normal after a short time. Foreign objects are filtered out by the oil filter.
PROCEDURE
1. PERFORM ACTIVE TEST USING TECHSTREAM (OCV OPERATION)
(a) Connect the Techstream to the DLC3.
(b) Start the engine and warm it up.
(c) Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the VVT System (Bank 1) or Control the VVT System (Bank 2).
(d) Using the tester, operate the OCV and check the engine speed.
OK:
NG -- CHECK VALVE TIMING
OK -- Continue to next step.
2. PERFORM ACTIVE TEST USING TECHSTREAM (OCV OPERATION)
(a) Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the VVT Linear (Bank 1) or Control the VVT Linear (Bank 2).
(b) Change the Control the VVT Linear (Bank 1) and Control the VVT Linear (Bank 2) values to a value between -100% to 100%.
HINT: Control the VVT Linear (Bank 1) and Control the VVT Linear (Bank 2) values should be added to the current OCV duty ratio.
(c) Confirm the current VVT angle by checking VVT Change Angle (Bank 1) and VVT Change Angle (Bank 2).
OK:
Operation of Control the VVT Linear (Bank 1) or Control the VVT Linear (Bank 2) leads to an immediate, linear change in the VVT angle.
NOTICE:
- With the engine idling and with the advanced camshaft timing (Control the VVT Linear (Bank 1) or Control the VVT Linear (Bank 2) has a value of 0% to 100%), engine revolutions will be rough or the engine will stall.
- When the vehicle is being driven, if the engine is turned off or the throttle valve is open, this Active Test will automatically be canceled.
NG -- CHECK VALVE TIMING
OK -- Continue to next step.
3. CHECK IF DTC OUTPUT REOCCURS
(a) Select check mode.
(b) Start and warm up the engine.
(c) Drive the vehicle for 10 minutes or more.
(d) Check for the DTC.
OK:
No DTC is output.
OK -- END
NG -- Continue to next step.
4. CHECK VALVE TIMING
(a) Remove the engine cover.
(b) Remove the drive belt.
(c) Remove the timing belt cover LH and RH.
(d) Turn the crankshaft to align the matchmarks of the crankshaft.
(e) Align the notch of the crankshaft pulley with the "0" position.
(f) Confirm whether the matchmarks of the camshaft pulley and cylinder head cover are facing each other.
(g) If the matchmarks are not facing each other, turn the crankshaft clockwise by 360°. Confirm again if the matchmarks are facing each other.
OK:
The matchmarks of the camshaft pulley and the cylinder head cover face each other when the notch of the crankshaft pulley is in the "0" position.
NG -- ADJUST VALVE TIMING
OK -- Continue to next step.
5. INSPECT CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY
(a) Measure the resistance of the OCV.
Standard resistance:
6.9 to 7.9 Ohms at 20°C (68°F)
(b) Remove the OCV.
(c) Apply battery voltage to the terminals of the OCV.
(d) Check the valve operation.
OK:
The valve moves quickly.
NG -- REPLACE CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY
OK -- Continue to next step.
6. INSPECT OIL CONTROL VALVE FILTER
(a) Remove the cylinder head cover.
(b) Remove the camshaft bearing cap and OCV filter.
(c) Check that the filter is not clogged.
OK:
The filter is not clogged.
NG -- CLEAN OIL CONTROL VALVE FILTER
OK -- Continue to next step.
7. REPLACE CAMSHAFT TIMING GEAR ASSEMBLY
(a) After replacing the camshaft timing gear, check the DTC.
(b) Clear the DTC and select check mode Check Mode Procedure.
(c) Start and warm up the engine.
(d) Drive the vehicle for 10 minutes or more.
(e) Check that no DTC is output.
NEXT -- END