Home Chapter 28 Chapter Quiz

# Chapter Quiz

This activity contains 10 questions.

## The sensor that most determines fuel delivery when a fuel-injected engine is first started is the _____________.

 O2S ECT sensor Engine MAP sensor IAT sensor

## What happens to the voltage measured at the ECT sensor when the thermostat opens?

 Increases slightly Increases about 1 volt Decreases slightly Decreases about 1 volt

## Two technicians are discussing a stepped ECT circuit. Technician A says that the sensor used for a stepped circuit is different than one used in a non-stepped circuit. Technician B says that a stepped ECT circuit uses different internal resistance inside the PCM. Which technician is correct?

 Technician A only Technician B only Both Technicians A and B Neither Technician A nor B

## When testing an ECT sensor on a vehicle, a digital multimeter can be used and the signal wires back probed. What setting should the technician use to test the sensor?

 AC volts DC volts Ohms Hertz (Hz)

## When testing the ECT sensor with the connector disconnected, the technician should select what position on the DMM?

 AC volts DC volts Ohms Hertz (Hz)

## When checking the ECT sensor with a scan tool, about what temperature should be displayed if the connector is removed from the sensor with the key on, engine off?

 284°F (140°C) 230°F (110°C) 120°F (50°C) -40°F (-40°C)

Two technicians are discussing the IAT sensor. Technician A says that the IAT sensor is more important to the operation of the engine (higher authority) than the ECT sensor. Technician B says that the PCM will add fuel if the IAT indicates that the incoming air temperature is cold. Which technician is correct?

 Technician A only Technician B only Both Technicians A and B Neither Technician A nor B

## A typical IAT or ECT sensor reads about 3,000 ohms when tested using a DMM. This resistance represents a temperature of about _____________.

 -40°F (-40°C) 70°F (20°C) 120°F (50°C) 284°F (140°C)

## If the transmission fluid temperature (TFT) sensor indicates cold automatic transmission fluid temperature, what would the PCM do to the shifts?

 Normal shifts and normal operation of the torque converter clutch Disable torque converter clutch; normal shift points Delayed shift points and torque converter clutch disabled Normal shifts but overdrive will be disabled

## A P0118 DTC is being discussed. Technician A says that the ECT sensor could be shorted internally. Technician B says that the signal wire could be open. Which technician is correct?

 Technician A only Technician B only Both Technicians A and B Neither Technician A nor B