P0024

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)

DESCRIPTION

DTC Detection Condition:

This DTC is designed to detect opens or shorts in the camshaft oil control valve (OCV) circuit. If the OCV's duty-cycle is excessively high or low while the engine is running, the ECM will illuminate the MIL and set the DTC.

The Variable Valve Timing (VVT) system adjusts the exhaust valve timing to improve the driveability. The engine oil pressure turns the camshaft actuator to adjust the valve timing. The OCV is a solenoid valve and switches the engine oil line. The valve moves when the ECM applies the 12 volts to the solenoid. The ECM changes the energizing time to the solenoid (duty-cycle) in accordance with the camshaft position, crankshaft position, throttle position, etc.

MONITOR DESCRIPTION

Monitor Strategy:

Typical Enabling Conditions:

Typical Malfunction Thresholds:

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.

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 following conditions (1), 2. and 3. 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.
2. It takes 5 seconds or more to change the valve timing by 5 °CA.
3. After procedures 1. and 2. are met, the OCV is forcibly activated 63 times or more.

DTCs P0014 and P0024 (Advanced Cam Timing) are subject to 2 trip detection logic.
DTCs P0015 and P0025 (Retarded Cam Timing) are subject to 1 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 not run unless 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 (retarded angle side only).

Wiring Diagram:

Step 1-2:

Step 2(Continued)-6:

Step 6(Continued)-8:

INSPECTION PROCEDURE






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