Chapter 72 Haldermann

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

Increases slightly

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

Ohms

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?

-40 degrees F

A typical IAT or ECT sensor reads about 3000 ohms when tested using a DMM. This resistance represents a temperature of about ...

70 degrees F

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?

DC volts

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

Delayed shift points and torque converter clutch disabled.

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

ECT sensor

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. Who is right?

Technician B

Two technicians are discussing a stepped ECT circuit. Technician A says that the sensor used for a stepped circuit is different from the one used in a non-stepped circuit. Technician B says that a stepped ECT circuit uses different internal resistance inside the PCM. Who is right?

Technician B

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. Who is right?

Technician B