Exam 24: Engine Performance Systems

The three pollutants found in the exhaust gases are hydrocarbons, carbon monoxide, and ____________________ .

What is a type A misfire?

In a GDI system (gasoline direct injection) the injector sprays fuel into the ______.

Before performing any repairs on a vehicle with an illuminated MIL light: Technician A records all DTCs and freeze frame data. Technician B checks for service bulletins.Who is correct?

List the major components of the fuel delivery system.

A fault that comes and goes and is not always present is called a(n) ____________________ fault.

A V-6 engine has an oxygen sensor in each exhaust manifold. How do you determine which one is B1 S1?

The injector pulse width is ______.

Which of the following chemicals is NOT a pollutant?

What is the difference between closed loop and open loop engine operation?

All cars built since ____________________ are equipped with an electronic fuel injection system.

During the secondary AIR active test, the PCM cycles the AIR flow to the exhaust manifold on and off during closed loop operation and monitors the ____________________ voltage and the short-term fuel trim value.

Scan tools can be used to cycle on and off some actuators such as injectors, vacuum solenoids, idle air control motors, and the like.

The PCM can be electronically linked to other control modules.

A PCM that can learn the nominal range of inputs and outputs by monitoring them over a long period of time is said to be using ____________________ strategy.

Engine operating modes are being discussed. Technician A says that when the engine is in closed-loop mode, the PCM monitors sensor inputs, then adjusts the timing, air fuel ratio, and emission controls. Technician B says the system will switch into open loop when the throttle is fully opened or the oxygen sensors cool down during idle. Who is correct?

PCM stands for ____________________.

What is an OBD-II trip?

Technician A uses the snapshot function of his scan tool to record serial data during a road test that can be transferred and displayed on a PC. Technician B uses the snapshot feature of his scan tool to record the sensor data and conditions leading up to the vehicle setting a DTC. Who is correct?

Freeze frame data is being discussed. Technician A says erasing the code with a scan tool will erase the corresponding freeze frame data. Technician B says the freeze frame data is the sensor and output status data at the instant the DTC was set. Who is correct?