Exam 11: Electronically Controlled Transmission

Technician A says the Powertrain Control Module (PCM) cannot identify and adapt to environmental conditions. Technician B says the first step in a PCM's fault detection system is a basic circuit test. Who is correct?

Manifold vacuum is a good indicator of engine load and was used on hydraulically controlled transmissions through the vacuum modulator.

All the following statements describing VSS are true EXCEPT:

On electronically controlled transmissions, line pressure is controlled using a/an _______.

Tech A says that electronic transmissions today are smaller and lighter than hydraulically controlled transmissions. Tech B says that electronic transmissions are beefier today to withstand higher torques. Who is correct?

Which of the following describes the information provided by the Accelerator Pedal Position (APP) sensor?

In a fully electronically controlled automatic transmission, the shift points are controlled by hydraulic and mechanical devices such as springs and valves.

Technician A says electronically controlled transmissions use Electronic Pressure Control (EPsolenoids to control shift timing. Technician B says when looking at electronic pressure control solenoids with a digital storage oscilloscope (DSO); the voltage pattern would be a square wave. Who is correct?

In computer controlled transmissions, which of the following is controlled electronically to direct hydraulic pressure to move the shift valves and activate the various clutches and bands within the transmission?

Technician A says that the brake light switch may be a separate switch from the brake on/off switch. Technician B says that the brake switch may also be used to put the vehicle transmission in neutral. Who is correct?

The PCM varies the shift timing and pressures based on changes from this thermistor sensor.

Technician A says a solenoid valve is a hydraulic valve that controls the flow of electricity to the Powertrain Control Module (PCM). Technician B says that solenoid valves are typically used to control the flow of fluid to shift valves, or directly to clutches and bands. Who is correct?

Which of the following is used by the PCM to tell which gear range the driver has selected with the shift lever?

Technician A says the Powertrain Control Module (PCM) manages engine torque by retarding engine ignition timing prior to transmission shifts. Technician B says limp-in mode refers to the vehicle still functioning in the event of a failure of the transmission computer or part of the PCM that controls the transmission. Who is correct?

Which of the following input shaft speed sensor designs does not require a reference voltage to operate?

Which of the following switch designs are used as pressure switches in computer controlled transmissions?

The PCM uses the information from a pressure switch to determine if a particular circuit has pressure.

Which of the following is used by the PCM to tell which gear range the driver has selected with the shift lever?

Where are Throttle Position Sensors (TPS) mounted?

By having a completely electronically controlled transmission and engine, the PCM is able to reduce the amount of torque being produced by the engine just after the transmission shifts.