Exam 25: Detailed Diagnosis and Sensors

Which of the following problems would NOT cause a oxygen sensor to appear bad?

Which of the following tools cannot be used to test an oxygen sensor?

Drivability problems that do not set a DTC are diagnosed by ____________________ strategy.

Oxygen sensors may become contaminated by ______.

The engine coolant temperature sensor helps to control all the following EXCEPT:

A vehicle with a DTC for an engine coolant temperature out of range code is being tested. The serial data stream shows the coolant temperature to be 198 degrees Fahrenheit. When the technician tests the resistance between the ETC terminals, he finds infinite resistance. The specifications call for 20 to 40 ohms at 200 degrees Fahrenheit. After the ECT is replaced and the code is erased, the system runs normally and the code and MIL illumination do not reoccur. How is this possible?

Which of the following tools should not be used to test an actuator unless the technician is directed to do so by the manufacturer's service procedures?

A typical upstream oxygen sensor should have a voltage that toggles between ____________________ volt (low) and ____________________ volt (high) when the system is working in closed loop.

Technician A tests an MAF sensor with a scan tool by watching for erratic changes in flow while the engine idles. Technician B checks an MAF sensor by tapping it lightly with the handle of a screwdriver while watching the waveform on a lab scope. Who is correct?

____________________ are electromechanical devices that convert an electrical current into mechanical action.

Mode 6 data are the results of the monitor diagnostic tests.

The ____________________ sensor measures the amount of air in grams per second entering the engine.

What is an OBD-II drive cycle?

The vehicle speed sensor is typically mounted on the ____________________.

Which of the following tools is NOT used in testing engine sensors?

Which of the following is NOT a type of mass airflow sensor?

A steel feeler gauge and voltmeter is used to test a ____________________ sensor.

The voltage drop between the PCM and the battery negative terminal should be ____________________ millivolts or less.

A technician is rebuilding an engine and notices that one tooth is missing from the crank sensor pulse ring. Technician A says the pulse ring is broken and will have to be replaced. Technician B says that missing tooth identifies when cylinder #1 is at TDC and that the missing tooth is normal. Who is correct?

Normal throttle position sensor signal voltage at closed throttle [idle] is ____________________ volt.