Exam 11: Electronically Controlled Transmission

What kind of resistor is an Engine Coolant Temperature (ECT) sensor?

What type of resistor is a transmission fluid temperature sensor?

Technician A says the Engine Coolant Temperature (ECT) sensor is not like the Transmission Fluid Temperature (TFT) sensor. Technician B says the Powertrain Control Module (PCM) or Transmission Control Module (TCM) uses the ECT to vary shift timing and pressure based on engine temperature. Who is correct?

The brake light switch is a normally open switch that closes when the brake pedal is depressed.

A vehicle comes in with the check engine light on. The vehicle is scanned and has transmission ratio error codes for 1st, 2nd, 3rd, and 4th gears (i.e. all forward gears). Technician A says that the problem could be a faulty output shaft speed sensor. Technician B says that the problem could be a faulty transmission front pump. Who is correct?

The sensor responsible for sending a signal that indicates the amount of load on an engine is the:

Where is the Throttle Position Sensor (TPS) mounted?

The __________ sends a signal to the PCM so that the line pressure can be adapted to change shift timing based on current pressure readings.

Technician A says that the EPC solenoid controls line pressure. Technician B says that if an EPC fails, it will default to minimum line pressure. Who is correct?

Line pressure sensors are being discussed. Technician A says the line pressure sensor is a pressure transducer. Technician B says the sensor is a potentiometer. Who is correct?

Technician A says electronically controlled transmissions use Electronic Pressure Control (EPC) solenoids to control line pressure. Technician B says when testing EPC solenoids with a digital storage oscilloscope (DSO), the voltage pattern would be a square wave. Who is correct?

What unit of measure is often used to express the amount of intake air measured by the Mass Air Flow (MAF) sensor?

Technician A says that a line pressure sensor is supplied a reference voltage from the PCM power supply relay. Technician B says that the line pressure sensor varies the voltage and sends the signal to the PCM. Who is correct?

In a fully hydraulically controlled transmission, the shift points are controlled by:

Where is the Engine Coolant Temperature (ECT) sensor normally located?

Technician A states that the PCM receives various inputs from the drivetrain to determine the shift timing and the firmness of the shift. Technician B states that in a fully hydraulically controlled transmission, the shift points are controlled by hydraulic and mechanical devices. Who is correct?

In electronically controlled transmissions, the shift points are controlled by:

The TCM/PCM will not vary shift timing and pressures based on information from the accelerator pedal position sensor.

Technician A says that an input shaft speed sensor is the magnetic pick-up type sensor. Technician B says that an input shaft speed sensor is a reed type switch. Who is correct?

Technician A says on computerized transmissions, an electronic pressure control (EPsolenoid is used to regulate transmission line pressure. Technician B says most EPC solenoids are pulse-width modulated. Who is correct?