Exam 11: Electronically Controlled Transmission

After 1996, the MAP sensor became the primary sensor to determine engine load.

What information is provided via the anti-lock brake sensors that may confirm poor tire traction, and a winter shift program can be initiated by the PCM on a vehicle with traction control?

Some transmissions shift into overdrive and engage the torque converter clutch when the brake input is received by the Powertrain Control Module (PCM).

Transmission pressure switches are:

Since 1996, the __________ is the primary sensor for determining an engine's load.

Tech A says that automatic transmissions will change gear ratios based upon winter weather conditions. Tech B says that on a vehicle with traction control, the transmission will change shift programming to assist. Who is correct?

Which of the following is typically the output of a reed switch?

Choose the correct statement with respect to limp-in mode.

The PCM uses the __________ to determine engine speed.

Technician A says that a quick depressing of the accelerator pedal could indicate more power and a need for a downshift and delayed upshifts. Technician B says that a quick release of the throttle pedal could indicate more power and a need for a downshift and delayed upshifts. Who is correct?

Technician A says the Engine Coolant Temperature (ECT) value can be viewed on a scan tool. Technician B says by unplugging and jumping the ECT pins in the connector, you can diagnose an ECT sensor using the scan tool. Who is correct?

Which of the following is installed in an engine coolant passage, often near the thermostat housing on an engine?

Technician A says that a MAF sensor that is not reading correctly may be dirty and need to be cleaned. Technician B says that a MAF sensor that is not reading correctly may be dirty and can only be replaced. Who is correct?

Technician A says Mass Airflow (MAF) sensors are better sensors than Manifold Absolute Pressure (MAP) sensors for measuring load. Technician B says MAF sensors measure the actual mass of the air coming into the engine, so the Powertrain Control Module (PCM) can accurately calculate the proper amount of fuel. Who is correct?

Looking at the transmission fluid temperature (TFT) sensor value on the scan tool, which of the following values should the TOT match after the vehicle has been left overnight?

Technician A says Manifold Absolute Pressure (MAP) sensors can be connected directly to the intake manifold or connected through a vacuum hose. Technician B says most modern MAP sensors have replaced throttle position sensors. Who is correct?

Technician A says sometimes Mass Airflow (MAF) sensors can be cleaned when they have a buildup of dirt and contamination. Technician B says some manufacturers specifically say not to clean their MAF sensors. Who is correct?

Tech A says that the ECT and the TFT will delay transmission shifting. Tech B says that the ECT and the TFT could cause the transmission to shift sluggishly or way too soon. Who is correct?

After a prolonged cold soak, which of the following statements is True about the reading from the Transmission Oil Temperature (TOT) sensor if it is working properly?

The line pressure sensor in an automatic transmission is supplied with reference voltage from the PCM.