P0023

DTC P0013 CAMSHAFT POSITION "B" ACTUATOR CIRCUIT (BANK 1)
DTC P0023 CAMSHAFT POSITION "B" ACTUATOR CIRCUIT (BANK 2)

HINT: These DTCs relate to the Oil Control Valve (OCV) for exhaust camshaft.

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:

The ECM optimizes the valve timing using the VVT system to control the exhaust camshaft. The VVT system includes the ECM, the OCV (for exhaust camshaft) and the VVT controller. The ECM sends a target duty-cycle control signal to the OCV (for exhaust camshaft). This control signal regulates the oil pressure supplied to the VVT controller. The VVT controller can advance or retard the exhaust camshaft.

After the ECM sends the target duty-cycle signal to the OCV (for exhaust camshaft), the ECM monitors the OCV (for exhaust camshaft) current to establish an actual duty-cycle. The ECM determines the existence of a malfunction and sets the DTC when the actual duty-cycle ratio varies from the target duty-cycle ratio.

Wiring Diagram:

Step 1-2:

Step 3-4:

INSPECTION PROCEDURE

HINT:
- If DTC P0013 is displayed, check the right bank VVT system for exhaust camshaft circuit.
- If DTC P0023 is displayed, check the left bank VVT system for exhaust camshaft circuit.
- 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.