P0015

DTC P0014 Camshaft Position "B" - Timing Over-Advanced or System Performance (Bank 1)
DTC P0015 Camshaft Position "B" - Timing Over-Retarded (Bank 1)
DTC P0024 Camshaft Position "B" - Timing Over-Advanced or System Performance (Bank 2)
DTC P0025 Camshaft Position "B" - Timing Over-Retarded (Bank 2)

DTC Detection Condition:

DESCRIPTION

HINT: If DTC P0014, P0015, P0024 or P0025 is present, check the VVT (Variable Valve Timing) system. 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 exhaust 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 exhaust 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 Strategy:

Typical Enabling Conditions:

Typical Malfunction Thresholds (Part 1):

Typical Malfunction Thresholds (Part 2):

MONITOR DESCRIPTION

1. The ECM optimizes the exhaust valve timing using the VVT (Variable Valve Timing) system to control the exhaust camshaft. The VVT system includes the ECM, the Oil Control Valve (OCV) and the VVT controller.
2. 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 exhaust camshaft.
If the difference between the target and actual exhaust valve timing is large, and changes in actual exhaust 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 given conditions A, B and C are met:

1. The difference between the target and actual exhaust valve timing is more than 5 °CA (Crankshaft Angle) and the condition continues for more than 4.5 seconds (Procedure "A").
2. It takes 5 seconds or more to change the valve timing by 5 °CA (Procedure "B").
3. After conditions "A" and "B" are met, the OCV is forcibly activated 63 times or more (Procedure "C").

3. DTCs P0014 and P0024 (Advanced Cam Timing) are subject to 1 trip detection logic.
4. DTCs P0015 and P0025 (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.

5. The monitor will not run unless the given conditions are met:
a. The engine is warm (the engine coolant temperature is 75 °C [167 °F] or more).
b. The vehicle has been driven at more than 40 mph (64 km/h) for 3 minutes.
c. The engine has idled for 3 minutes.

Wiring Diagram:

Step 1-3:

Step 3(Continued)-5:

Step 5(Continued)-8:

Step 8(Continued):

INSPECTION PROCEDURE

HINT:
- If DTC P0014 or P0015 is displayed, check the bank 1 VVT system for exhaust camshaft circuit.
- Bank 1 refers to the bank that includes cylinder No. 1.
- If DTC P0024 or P0025 is displayed, check the bank 2 VVT system for exhaust camshaft circuit.
- Bank 2 refers to the bank that does not include cylinder No. 1.
- Read freeze frame data using the intelligent tester. 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.