P0012
2UZ-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
HINT: These DTCs relate to the Oil Control Valve (OCV).
The Variable Valve Timing (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. Camshaft timing control is performed according to engine operating conditions such as intake air volume, throttle valve position and engine coolant temperature.
The ECM controls the OCV, based on the signals transmitted by several sensors. The VVT controller regulates the intake camshaft angle using oil pressure through the OCV. As a result, the relative positions of the camshaft and crankshaft are optimized, the engine torque and fuel economy improve, and the exhaust emissions decrease under overall driving conditions. The ECM detects the actual intake valve timing using signals from the camshaft and crankshaft position sensors, and performs feedback control. This is how the target intake valve timing is verified by the ECM.
MONITOR DESCRIPTION
The ECM optimizes the valve timing using the Variable Valve Timing (VVT) system to control the intake valve camshaft. The VVT system includes the ECM, the OCV and the VVT controller. The ECM sends a target "duty-cycle" control signal to the OCV. This control signal, applied to the OCV, regulates the oil pressure supplied to the VVT controller. The VVT controller can advance or retard the intake valve camshaft.
Example:
A DTC will set if: 1) the difference between the target and actual valve timing is more than 5° of the Crankshaft Angle (CA) and the condition continues for more than 4.5 sec.; or 2) the OCV is forcibly activated 63 times or more.
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:
MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
TYPICAL MALFUNCTION THRESHOLDS
Advance:
Retarded:
WIRING DIAGRAM
INSPECTION PROCEDURE
- If DTC P0011 or P0012 is displayed, check the bank 1 Variable Valve Timing (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. No. 1 cylinder is located in the front part of the engine, opposite the transmission.
- Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air/fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.
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 Techstream, operate the Oil Control Valve (OCV) and check the engine speed.
Standard:
HINT: DTC P0011, P0012, P0021 or P0022 is also output when a foreign object is detected in some parts of the system in the engine oil, and then the system returns to normal in a short time. As the ECM is controlled to eject a foreign object, there is no problem with the VVT. There is also no problem with the VVT as the oil filter should catch the foreign object in the engine oil.
OK -- VVT SYSTEM OK
NG -- Continue to next step.
2. CHECK VALVE TIMING (CHECK FOR LOOSE AND JUMPED TOOTH OF TIMING BELT)
(a) Check the valve timing Installation.
NG -- ADJUST VALVE TIMING
OK -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR (OCV - ECM)
(a) Inspect using an oscilloscope.
(b) During idling, check the waveform between the specified terminals of the E7 ECM connector.
Standard:
The correct waveform is as shown.
NG -- REPLACE ECM
OK -- Continue to next step.
4. INSPECT CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY
(a) Remove the V-bank cover.
(b) Remove the air cleaner inlet and intake air connector.
(c) Disconnect the C19 and C20 Oil Control Valve (OCV) connectors.
(d) Measure the resistance of the OCV.
Standard resistance:
6.9 to 7.9 Ohms at 20°C (68°F)
(e) Reconnect the OCV connector.
(f) Reinstall the air cleaner inlet and intake air connector.
(g) Reinstall the V-bank cover.
NG -- REPLACE CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY
OK -- Continue to next step.
5. INSPECT CAMSHAFT TIMING GEAR ASSEMBLY
(a) Remove the timing belt Removal.
(b) Remove the cylinder head cover.
(c) Remove the OCV.
(d) Drain the oil in the VVT controller assembly.
(e) Check whether the oil in VVT controller assembly is drained or not.
Standard:
The oil in VVT controller assembly is drained.
(f) Reinstall the OCV.
(g) Reinstall the cylinder head cover.
(h) Reinstall the timing belt.
OK -- INSPECT OIL CONTROL VALVE FILTER
NG -- Continue to next step.
6. REPLACE CAMSHAFT TIMING GEAR ASSEMBLY
NEXT -- Continue to next step.
7. INSPECT OIL CONTROL VALVE FILTER
(a) Remove the cylinder head cover Removal.
(b) Remove the camshaft bearing cap and OCV filter.
(c) Check that the filter is not clogged.
OK:
The filter is not clogged.
(d) Reinstall the camshaft bearing cap and OCV filter.
(e) Reinstall the cylinder head cover.
NG -- CLEAN OIL CONTROL VALVE FILTER
OK -- Continue to next step.
8. CHECK WHETHER DTC OUTPUT RECURS (DTC P0011, P0012, P0021 OR P0022)
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch ON and turn the tester ON.
(c) Clear the DTCs.
(d) Start the engine and warm it up.
(e) Switch the ECM from normal mode to check mode using the tester.
(f) Drive the vehicle for more than 10 minutes.
(g) Read output DTCs using the tester.
Standard:
No DTC output.
HINT: DTC P0011 or P0012 is output when foreign objects in engine oil are caught in some parts of the system. These codes will stay registered even if the system returns to normal after a short time. These foreign objects are then captured by the oil filter, thus eliminating the source of the problem.
OK -- SYSTEM OK
NG -- REPLACE ECM