P0012
1GR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0011,P0012,P0021,P0022: 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)
CAUTION / NOTICE / HINT
HINT: If DTC P0011, P0012, P0021 or P0022 is present, check the VVT (Variable Valve Timing) system.
DESCRIPTION
The Variable Valve Timing (VVT) system includes the ECM, 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 the 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 intake valve timing using the VVT (Variable Valve Timing) system to control the intake camshaft. The VVT system includes the ECM, the Oil Control Valve (OCV) and the 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 actual intake valve timing are small, the ECM interprets this as the VVT controller stuck malfunction and sets a DTC.
Example:
A DTC is set when the following conditions 1 and 2 are met for 10 seconds or more:
1. The difference between the target and actual intake valve timings 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.
DTCs P0011 and P0021 (Advanced Cam Timing) are subject to 1 trip detection logic.
DTCs P0012 and P0022 (Retarded Cam Timing) are subject to 2 trip detection logic.
These DTCs indicate that the VVT controller cannot operate properly due to OCV malfunctions or the presence of foreign objects in the OCV.
The monitor will not run unless the following conditions are met:
- The engine is warm (the engine coolant temperature is 75°C [167°F] or more).
- The vehicle has been driven at more than 40 mph (64 km/h) for 3 minutes.
- The engine has idled for 3 minutes.
MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
TYPICAL MALFUNCTION THRESHOLDS
- If the difference between the target and actual camshaft timings is greater than the specified value, the ECM operates the VVT actuator.
- Then, the ECM monitors the camshaft timing change for 5 seconds.
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
- If DTC P0011 or P0012 is displayed, check the bank 1 VVT system circuit.
- Bank 1 refers to the bank that includes cylinder No. 1.
- If DTC P0021 or P0022 is displayed, check the bank 2 VVT system circuit.
- Bank 2 refers to the bank that does not include cylinder No. 1.
- Read freeze frame data using the Techstream. Freeze frame data record the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, 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.
PROCEDURE
1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0011, P0012, P0021 OR P0022)
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON and turn the Techstream on.
(c) Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
(d) Read DTCs.
Result
HINT: If any DTCs other than P0011, P0012, P0021 or P0022 are output, troubleshoot those DTCs first.
B -- GO TO DTC CHART
A -- Continue to next step.
2. PERFORM ACTIVE TEST USING TECHSTREAM (OPERATE OCV)
(a) Connect the Techstream to the DLC3.
(b) Start the engine and turn the Techstream on.
(c) Warm up the engine.
(d) Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the VVT System (Bank 1) or Control the VVT System (Bank 2).
(e) Check the engine speed while operating the Oil Control Valve (OCV) using the Techstream.
OK:
NG -- CHECK VALVE TIMING (CHECK FOR LOOSE AND JUMPED TEETH ON TIMING CHAIN)
OK -- Continue to next step.
3. CHECK WHETHER DTC OUTPUT RECURS (DTC P0011, P0012, P0021 OR P0022)
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON and turn the Techstream on.
(c) Clear DTCs DTC Check / Clear.
(d) Start the engine and warm it up.
(e) Switch the ECM from normal mode to check mode using the Techstream Check Mode Procedure.
(f) Drive the vehicle for more than 10 minutes.
(g) Read DTCs using the Techstream.
OK:
No DTC output.
NG -- CHECK VALVE TIMING (CHECK FOR LOOSE AND JUMPED TEETH ON TIMING CHAIN)
OK -- END
4. CHECK VALVE TIMING (CHECK FOR LOOSE AND JUMPED TEETH ON TIMING CHAIN)
(a) Remove the cylinder head cover Removal or Removal).
(b) Turn the crankshaft pulley, and align its groove with the timing mark "0" of the timing chain cover.
(c) Check that the Alignment marks of the camshaft timing gears are aligned with the Alignment marks of the bearing cap as shown in the illustration.
If not, turn the crankshaft 1 revolution (360°) to align the marks as above.
OK:
Alignment marks on camshaft timing gears are aligned as shown in the illustration.
(d) Reinstall the cylinder head cover Removal or Removal).
NG -- ADJUST VALVE TIMING
OK -- Continue to next step.
5. INSPECT CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY (OCV)
(a) Remove the camshaft timing oil control valve assembly Removal.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
(c) Apply the positive battery voltage to terminal 1 and negative battery voltage to terminal 2. Check the valve operation.
OK:
Valve moves quickly.
(d) Reinstall the camshaft timing oil control valve assembly Installation.
NG -- REPLACE CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY
OK -- Continue to next step.
6. INSPECT OIL CONTROL VALVE FILTER
OK:
Filter is not clogged.
NG -- CLEAN OIL CONTROL VALVE FILTER
OK -- Continue to next step.
7. REPLACE CAMSHAFT TIMING GEAR ASSEMBLY
NEXT -- Continue to next step.
8. CHECK IF DTC OUTPUT RECURS
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON and turn the Techstream on.
(c) Clear DTCs DTC Check / Clear.
(d) Start the engine and warm it up.
(e) Switch the ECM from normal mode to check mode using the Techstream Check Mode Procedure.
(f) Drive the vehicle for more than 10 minutes.
(g) Confirm that no DTC is set using the Techstream.
OK:
No DTC output.
HINT: DTC P0011, P0012, P0021 or P0022 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.
NG -- REPLACE ECM
OK -- END