Chapter 11 - Variable Valve Timing Systems

To reduce oxides of nitrogen (NOx) exhaust emissions, which camshaft is varied?

A. Exhaust camshaft only

Variable valve timing can be found on which type of engines?

D. All of the above

What sensors are used by the PCM to determine the best position of the camshaft for maximum power and lowest possible exhaust emissions?

D. All of the above

How quickly can the rocker arms be switched from low speed camshaft profile to the high speed camshaft

B. 100 milliseconds

To increase engine performance, which camshaft is varied?

B. Intake camshaft only

How is the camshaft actuator controlled?

B. Pulse width modulated (PMW) signal

What is the command pulse width of the camshaft pahser that results in the desired position?

C. 50%

Which diagnostic trouble code (DTC) may be set if there is a problem with the bank 1 intake cam position?

C. P0011 or P0012

If the engine oil is not changed regularly, what is the most likely fault that can occur to an engine equipped with variable valve timing (VVT)?

C. The filter screens on the actuator control valve become clogged

If the incorrect grade of engine oil is used in an engine equipped with a variable displacement engine, what diagnostic trouble code (DTC) could be set?

D. P0011