P0015

DTC P0014 CAMSHAFT POSITION "B"- ADVANCED OR SYSTEM PERFORMANCE (BANK 1)
DTC P0015 CAMSHAFT POSITION "B"- TIMING OVER-RETARDED (BANK 1)
DTC P0024 CAMSHAFT POSITION "B"- ADVANCED OR SYSTEM PERFORMANCE (BANK 2)
DTC P0025 CAMSHAFT POSITION "B"- TIMING OVER-RETARDED (BANK 2)

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

CIRCUIT DESCRIPTION

DTC Detection Condition:

The Variable Valve Timing (VVT) system controls the exhaust camshaft to provide the optimal valve timing for every driving condition. This control is performed based on the signals, such 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 exhaust camshaft angle using oil pressure through the OCV. As a result, the relative position between the camshaft and the crankshaft becomes optimal, and the engine torque and fuel economy improve, and 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:

DTC P0014 and DTC P0024
The ECM compares current valve timing with target valve timing, while the engine is running and after being warmed up, in order to monitor the VVT system on the exhaust side. Valve timing is calculated from the positions of the camshaft and crankshaft. The ECM controls the engine so that current valve timing meets target valve timing. If these timings are not met, the ECM determines this as a malfunction.

DTC P0015 and P0025
The ECM compares current valve timing with target valve timing, while the engine is running and after being warmed up, in order to monitor the VVT system on the exhaust side. Valve timing is calculated from the positions of the camshaft and crankshaft. The ECM controls the engine so that current valve timing meets target valve timing. If these timings are not met, the ECM determines this as a malfunction.

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:

Step 1-2:

Step 3-4:

Step 5-6:

INSPECTION PROCEDURE






HINT:
- If DTC P0014 or P0015 is displayed, check the bank 1 VVT system 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 circuit.
- Bank 2 refers to the bank that does not include cylinder No.1.
- 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.