Exam 25: Detailed Diagnosis and Sensors

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

When the fuel system is running rich, the oxygen content in the exhaust is ____________________  .

The vehicle speed sensor is typically mounted on the ____________________.

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?

The device that protects the PCM and other electronic components from the voltage spike created in the windings of a solenoid, relay, or magnetic clutch when they are turned off is called a ______.

Oxygen sensors may become contaminated by ______.

The MAP sensor used on a turbocharged engine is calibrated the same as a MAP sensor for a nonturbocharged engine.

What types of problems could be caused by a faulty engine coolant temperature sensor?

A technician connects a DMM with a MIN/MAX/AVG function to the output of an oxygen sensor. The engine is run at 2000 RPM for several minutes. During the test, the voltage toggles rapidly between 150 and 900 millivolts. At the end of the test, the MAX voltage was .967 V, the MIN voltage was .087 V, and the AVG voltage was .683 V. Technician A says the sensor is faulty and should be replaced. Technician B says there could be a vacuum leak that caused the sensor voltage to have a higher than normal average. Who is correct?

A throttle position sensor has ______.

Two technicians are discussing IAT sensors (intake air temperature). Technician A says the IAT sensor is an integral part of the mass airflow sensor (MAF). Technician B says the IAT is a discrete sensor located in the intake air passages or air cleaner assembly. Who is correct?

The hot wire in the mass airflow sensor is held at a constant ____________________ degrees Celsius.

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

Which of the following statements is NOT true?

The engine coolant temperature sensor is typically found in the radiator.

If the MIL light is ON, there will be a DTC and associated freeze frame data stored in the PCM's memory.

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

Trouble codes are being discussed. Technician A says that the first time the system detects a fault, a pending code is set. Technician B says that a pending code will turn on the MIL light. Who is correct?

Which of the following is NOT an actuator?

An air/fuel ratio sensor is different from an oxygen sensor in that ______.