P0011

DTC P0011CAMSHAFT 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 (BANK2)

HINT:
- 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 cylinder No. 1, but bank 2 does not. Cylinder No. 1 is located in the front part of the engine, opposite the transmission.

CIRCUIT DESCRIPTION

DTC Detection Condition:

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 the signals, such conditions as intake air volume, throttle position and engine coolant temperature.

The ECM controls the oil control valve (OCV), based on the signals output from the sensors. The VVT controller regulates the intake camshaft angle using oil pressure through the OCV. As result, the relative position between the camshaft and the crankshaft becomes optimal, and the engine torque improves, fuel economy improves, 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

Monitor Strategy:

Typical Enabling Conditions:

Typical Malfunction Thresholds:

The ECM optimizes the valve timing using the VVT system to control the intake valve camshaft. The VVT system includes the ECM, the OCV and the VVT actuator. 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 degrees of the Crankshaft Angle (CA) and the condition continues for more than 4.5 seconds; 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:
- After engine warm-up (engine coolant temperature 75 degrees C (167 degrees F) or more).
- After driving the vehicle over 40 km/h (25 mph) for 3 minutes.
- After idling the engine for 3 minutes.

If the difference between target and actual camshaft timing is larger than the specified value, the ECM operates the VVT actuator. Then, the ECM monitors the camshaft timing change for 5 seconds.

Wiring Diagram:

Step 1-2:

Step 3-5:

Step 6:

INSPECTION PROCEDURE

HINT: Read freeze frame data using the hand-held tester. 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.

NOTE: DTCs P0011, P0012, P0021 or P0022 is output when a foreign object in the engine oil enters the system. These codes will stay even if the system returns to normal after a short time. Foreign objects are filtered out by the oil filter.