P0012
1NZ-FXE 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)
DESCRIPTION
The Variable Valve Timing (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, applied to the OCV, regulates the oil pressure supplied to the VVT controller. Camshaft timing control is performed based on engine operation condition such as intake air volume, throttle position and engine coolant temperature.
The ECM controls the OCV based on the signals 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 is optimized, the engine torque and fuel economy improve, and exhaust emissions decrease. The ECM detects the actual valve timing using signals from the camshaft position sensor and the crankshaft position sensor. The ECM performs feedback control and verifies target valve timing.
MONITOR DESCRIPTION
To monitor the VVT components, the ECM (PCM) measures the valve timing that is calculated by the camshaft position and crankshaft position. The valve timing is usually adjusted in accordance with the driving condition. If the valve timing variation is less than the malfunction criterion, the ECM illuminates the MIL and sets a DTC. P0011 is set when the valve timing is in the valve timing advance range. P0012 is set when the valve timing is in valve timing retard range.
MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
TYPICAL MALFUNCTION THRESHOLDS
P0011:
P0012:
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT: Read freeze frame data using 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 Freeze Frame Data.
PROCEDURE
1. CHECK VALVE TIMING (CHECK FOR LOOSE AND A JUMPED TOOTH OF TIMING CHAIN)
OK:
The matchmarks of the crankshaft pulley and camshaft pulley align.
NG -- ADJUST VALVE TIMING
OK -- Continue to next step.
2. PERFORM ACTIVE TEST USING TECHSTREAM (OPERATE OCV)
(a) Connect Techstream to the DLC3.
(b) Turn the power switch ON (IG).
(c) Turn Techstream ON.
(d) Put the engine in inspection mode Service Precautions.
(e) Start the engine and warm it up.
(f) Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the VVT System (Bank 1).
(g) Using Techstream, operate the OCV and check the engine speed.
OK:
NOTE: Do not drive the vehicle without deactivating inspection mode, otherwise damaging the transaxle may result.
NG -- INSPECT CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY (OCV)
OK -- Continue to next step.
3. CHECK IF DTC OUTPUT RECURS
(a) Clear the DTCs DTC Check / Clear.
(b) Start the HV main system and warm the engine up.
(c) Drive the vehicle with the shift position in B at vehicle speed of more than 44 mph (70 km/h) approximately for 10 minutes or more.
(d) Read output DTCs using Techstream.
OK:
No DTC output.
HINT: *: DTC P0011 or P0012 is output when a foreign object in engine oil is caught in some part of the system.
These codes will stay registered even if the system returns to normal after a short time. Foreign objects are filtered out by the oil filter.
OK -- VVT SYSTEM OK*
NG -- Continue to next step.
4. INSPECT OIL CONTROL VALVE FILTER
(a) Remove the air cleaner inlet, bolt and oil control valve filter.
(b) Check for cloggings in the oil control valve filter.
OK:
The filter has not clogged.
(c) Reinstall the filter, bolt and air cleaner inlet.
NOTE: If necessary, clean the filter.
NG -- REPLACE OIL CONTROL VALVE FILTER
OK -- Continue to next step.
5. INSPECT CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY (OCV)
OK:
OCV has no contamination and moves smoothly.
NG -- REPLACE CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY
OK -- Continue to next step.
6. REPLACE CAMSHAFT TIMING GEAR ASSEMBLY
NEXT -- Continue to next step.
7. CHECK IF DTC OUTPUT RECURS
(a) Clear the DTCs DTC Check / Clear.
(b) Start the HV system, and warm the engine up.
(c) Drive the vehicle with the shift position in B at vehicle speed of more than 70 km/h (44 mph) approximately for 10 minutes or more.
(d) Read output DTCs using Techstream.
OK:
No DTC output.
NG -- REPLACE ECM
OK -- END