P0011
1NZ-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0011,P0012: Camshaft Position "A" - Timing Over-Advanced or System Performance (Bank 1)
DESCRIPTION
HINT
If DTC P0011 or P0012 is present, check the VVT (Variable Valve Timing) system.
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. 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 the actual intake valve timing are small, the ECM interprets this as the VVT controller stuck malfunction and sets a DTC.
- DTC P0011 (Advanced Cam Timing) is subject to 1 trip detection logic.
- DTC P0012 (Retarded Cam Timing) is 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 run if all of 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 monitor the camshaft timing change for 10 seconds.
MONITOR RESULT
HINT
Refer to Checking Monitor Status Mode 6 Data.
CONFIRMATION DRIVING PATTERN
- Connect the Techstream to the DLC3.
- Turn the ignition switch to ON and turn the Techstream on.
- Clear DTCs (even if no DTCs are stored, perform the clear DTC operation).
- Turn the ignition switch off and wait for at least 30 seconds.
- Turn the ignition switch to ON and turn the Techstream on [A].
- Start the engine and warm it up until the ECT reaches 75°C (167°F) or higher [B].
- Drive the vehicle for 5 minutes or more [C].
CAUTION:
When performing the confirmation driving pattern, obey all speed limits and traffic laws.
- Idle the engine for 30 seconds or more [D].
- Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [E].
- Read pending DTCs.
HINT
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
- Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
- Input the DTC: P0011 or P0012.
- Check the DTC judgment result.
HINT
- If the judgment result shows NORMAL, the system is normal.
- If the result shows ABNORMAL, the system has a malfunction.
- If the result shows INCOMPLETE or UNKNOWN, perform steps [F] through [H].
- Drive the vehicle for 5 minutes or more [F].
CAUTION:
When performing the confirmation driving pattern, obey all speed limits and traffic laws.
- Idle the engine for 30 seconds or more [G].
- Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [H].
- Read pending DTCs.
HINT
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
- Check the DTC judgment result again.
HINT
- If the judgment result shows NORMAL, the system is normal.
- If the result shows ABNORMAL, the system has a malfunction.
- If the result shows INCOMPLETE or UNKNOWN, perform the following procedure.
- Perform a universal trip and check for permanent DTCs DTC Check / Clear.
HINT
- If a permanent DTC is output, the system is malfunctioning.
- If no permanent DTC is output, the system is normal.
WIRING DIAGRAM
Refer to DTC P0010 P0010.
INSPECTION PROCEDURE
NOTICE:
DTC P0011 or P0012 may be set when foreign objects in the engine oil are caught in some parts of the system. The DTC will remain set even if the system returns to normal after a short time. Foreign objects are filtered out by the oil filter.
HINT
Read freeze frame data using a 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 OR P0012)
(a) Connect a 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 or P0012 are output, troubleshoot those DTCs first.
B -- GO TO DTC CHART Engine Control System - SFI System
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) On the Techstream, enter the following menu: Powertrain / Engine and ECT / Active Test / Control the VVT System (Bank 1).
(e) Check the engine speed while operating the Oil Control Valve (OCV) using the Techstream.
OK:
NG -- CHECK VALVE TIMING (CHECK FOR LOOSE TIMING CHAIN OR JUMPED TEETH)
OK -- Continue to next step.
3. CHECK WHETHER DTC OUTPUT RECURS (DTC P0011 OR P0012)
(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) Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern.
(e) Read DTCs.
OK:
No DTC output (No pending DTC output).
NG -- CHECK VALVE TIMING (CHECK FOR LOOSE TIMING CHAIN OR JUMPED TEETH)
OK -- END
1. CHECK VALVE TIMING (CHECK FOR LOOSE TIMING CHAIN OR JUMPED TEETH)
(a) Remove the cylinder head cover.
(b) Turn the crankshaft pulley, and align its groove with the timing mark "0" on the timing chain cover.
(c) Check that the timing marks on the camshaft timing sprocket and camshaft timing gear are facing upward as shown in the illustration.
If not, turn the crankshaft 1 revolution (360°), then align the marks as above.
OK:
Timing marks on camshaft timing gears are aligned as shown in the illustration.
(d) Reinstall the cylinder head cover.
NG -- ADJUST VALVE TIMING Removal
OK -- Continue to next step.
2. INSPECT CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY (OCV)
(a) Remove the OCV.
(b) Measure the resistance between the terminals of the OCV.
Standard resistance:
6.9 to 7.9 Ohms at 20°C (68°F)
(c) Apply the battery voltage to terminal 1 and terminal 2. Check the valve operation.
OK:
Valve moves quickly.
(d) Reinstall the OCV.
NG -- REPLACE CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY Removal
OK -- Continue to next step.
3. INSPECT OIL CONTROL VALVE FILTER
(a) Remove the generator.
(b) Remove the OCV filter.
(c) Check that the filter is not clogged.
OK:
Filter is not clogged.
(d) Reinstall the OCV filter.
(e) Reinstall the generator.
NG -- CLEAN OIL CONTROL VALVE FILTER
OK -- Continue to next step.
4. REPLACE CAMSHAFT TIMING GEAR ASSEMBLY
(a) Replace the camshaft timing gear assembly Removal.
NEXT -- Continue to next step.
1. CHECK WHETHER DTC OUTPUT RECURS (DTC P0011 OR P0012)
(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) Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern.
(e) Read output DTCs using the Techstream.
OK:
No DTC output (No pending 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.
NG -- REPLACE ECM Removal
OK -- END