General Information

Engine Control
P0014 \'B\' Camshaft Position - Timing Over-Advanced or System Performance (Bank 1) - General Information

Component Location





General Description

The CVVT (Continuously Variable Valve Timing) system is installed to the chain sprocket of the camshaft. This system controls the camshaft to provide the optimal valve timing for every driving condition. The PCM controls the Oil Control Valve(OCV), based on the signals output from mass air flow, throttle position and engine coolant temperature. The CVVT controller regulates the camshaft angle using oil pressure through the OCV. As result, the relative position between the camshaft and the crankshaft becomes optimal, and the engine torque improves, fuel economy improves, exhaust emissions decrease under over all driving conditions.

DTC Description

The PCM monitors the CAM phasing and compares the phasing to the desired setting.
PCM determines that a fault exists and a DTC is stored while vehicle is tip - in and out driving for 5 minutes.
PCM monitors CAM phaser error while CMP signal is normally generating and vehicle is driving in 2000 - 3000rpm.
If the CAM phaser does not move although PCM commands OCV duty cycle PCM determines that a faultexists and a DTC is stored.
PCM monitors OCV stuck while cam sinal is normally generating and Valve cleaning is not in progress.
If the CAM Acutal Position is too high or low and Difference between Cam Actual Positionand Desire Position is higher than 20° PCM determines that a fault exists and a DTC is stored.

DTC Detecting Condition





Specification





Diagnostic Circuit Diagram





Signal Waveform & Data




















Fig.1) Normal data of EX-CVVT at acceleration.
Fig.2) Normal graph of EX-CVVT at acceleration.
Fig.3) Normal waveform of CKPS & EX-CMPS at idle.
Fig.4) Normal waveform of CKPS & EX-CMPS at acceleration.
Fig.5) Normal data of EX-CVVT at idle.

This example shows a typical Crankshaft Position Sensor (CKPS) and Camshaft Position Sensor (CMPS) waveform at idle.(Fig1.) If the 17th signal of the CKPS after missing tooth is aligned with the high signal of the CMPS at idle, PCM recognizes that Synchronization between CKPS and CMPS is completed. Under acceleracting condition, the number of teeth between missing tooth and tooth aligned with edge of the CMPS high signal is decreased from idle condition.(Fig2.)