How to Check P0021 Camshaft Position-Timing Over-Advanced

How to Check P0021 Camshaft Position Timing Over Advanced

 

How to Check P0021 Camshaft Position Timing Over Advanced

 

Study Guide

Auto repair

Study and Component Location Study and General Description Study Guide The CVVT (Continuously Variable Valve Timing) system is installed to the chain sprocket of the intake camshaft. This system controls the intake camshaft to provide the optimal valve timing for every driving condition.Study The ECM 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 intake camshaft angle using oil pressure through the OCV. As result, the relative Study position between the camshaft and the crankshaft becomes optimal, and the engine torque improves, fuel economy improves, exhaust emissions decrease under overall driving conditions. Study and DTC Description If there is a delay between the target angle and the real angle over 5 times,ECM sets DTC P0021. DTC Detecting Condition Item Detecting Condition Possible Cause DTC Strategy Study Guide • Slow response check • Poor connection • Contamination of Oil / Clog of Oil path • OCV • CVVT Enable Conditions Study Guide   • Time after | target VVT angle –VVT angle | > 6 deg(2 sec) • Time after engine start > 10 ~ 60 sec • Coolant temperature : 0~120°C • Engine oil temperature : 0~130°C • 1000 < rpm < 6600rpm Threshold value Study Guide • Counter of delayed following target valve timing > 5 times Diagnosis Time • - MIL On Condition • 2 Driving Cycles Specification OCV Specification Coil Resistance (Ω) 6.7 ~ 7.7 (20°C) Study Guide and Auto Repair Signal Waveform & Data Fig.1) Normal waveform of OCV & IN-CMPS at idle. Study Guide Fig.2) Normal waveform of OCV & IN-CMPS at acceleration with load.Study Guide more info and trouble shooting