P0018

DTC P0018 CRANKSHAFT POSITION - CAMSHAFT POSITION CORRELATION (BANK 2 SENSOR A)

HINT:
- If DTC P0016 is displayed, check the bank 1 VVT OCV.
- If DTC P0018 is displayed, check the bank 2 VVT OCV.
- 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 a result, the relative position between the camshaft and the crankshaft becomes optimal, the engine torque and fuel economy improves, and then the 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 controller. 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. The ECM calibrates the valve timing of the VVT system by setting the camshaft to the maximum retard angle when the engine speed is idling.The ECM closes the OCV to retard the cam. The ECM stores this value as VVT learned value.When the difference between the target valve timing and the actual valve timing is more than 5 °, the ECM learns it. If the learned value meets both of the following conditions ("a" and "b"), the ECM interprets this as a defect in the VVT system and sets a DTC.

a. VVT learning value is less than 20 °CA or more than 39 °CA.
b. Above condition continues for 18 seconds or more.
This DTC shows that the camshaft was installed to the crankshaft at an incorrect angle.

Wiring Diagram:

Step 1:

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.