The CVVT (Continuously Variable Valve Timing) system is installed to the chain sprocket of the camshafts. This system controls the camshaft to provide the optimal valve timing for whole driving condition. The PCM controls the Oil Control Valve(OCV), based on the signals output from 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 overall driving conditions.
This diagnosis checks the camshaft position plausibility whether the expected range plus some margin is not violated that might be caused by a wrong engine repair, or a chain/belt misalignment. DTC P0017 is set when actual camshaft position is too much retarded or advanced than full retard position or full advance position. To continue the adjustment in such case could lead to a damage of the engine by hitting the valves with the piston.
Item
Detecting Condition
Possible Cause
DTC Strategy
Camshaft edge in CVVT full retard position out of Range compared to Reference position
Valve timing
Oil Control Valve
CVVT Assembly
Enable Conditions
Camshaft position adaptation value is valid
Threshold Value
Camshaft position adaptation < -15 °CRK
Camshaft position adaptation > +15 °CRK
Diagnostic Time
80 rev.
Mil On Condition
2 Driving Cycles
? Engine Speed (RPM)
? Inlet Camshaft Position Control
? Exhaust Camshaft Position Control