Twin Independent Variable Cam Timing (TI-VCT)
E178753
1
4
2
3
Friction washers
1
Friction washers
2
Crankshaft pulley bolt
3
Camshaft chain wheel bolts
4
The Ti-VCT system allows variable independent control
of both the intake and exhaust camshafts by adjusting
their rotational position. This alters the valves opening
and closing timing with relation to the crankshaft
position. Improved power from low to high engine
speeds (broadening of the torque curve) is achieved by
varying the valve overlap and camshaft timing to match
all operating ranges and ambient conditions which also
improves fuel economy, exhaust emissions, and engine
performance.
The camshaft adjustment units are controlled via two
VCT solenoids. The VCT solenoids for the intake and
exhaust camshafts differ only in terms of the position
of the fastening point by which they are fixed to the
VCT bearing cap.
Service Training
32
Lesson 3 – Powertrain
Engine