Question 1

A computer-controlled transmission that starts out in the wrong gear could be caused by ______.

Accepted Answer

A)  faulty solenoids 
B)  stuck valves 
C)  bad electrical grounds 
D)  all answers are correct 
A)  faulty solenoids 
B)  stuck valves 
C)  bad electrical grounds 
D)  all answers are correct D

Question 2

What type of sensor listed here is a potentiometer?

Accepted Answer

A)  pressure switch 
B)  TFT sensor [transmission fluid temperature] 
C)  TSS [turbine speed sensor] 
D)  TP [throttle position] 
A)  pressure switch 
B)  TFT sensor [transmission fluid temperature] 
C)  TSS [turbine speed sensor] 
D)  TP [throttle position] D

Question 3

How does a pressure control solenoid regulate transmission pressures?

Accepted Answer

To control fluid pressure, the PCM sends a varying pulse width modulated signal to the solenoid. This changes the amount the solenoid will cause the spool valve to move. When the solenoid is off, spring tension keeps the valve in place to maintain maximum pressure. When the solenoid is energized, it moves the spool valve. The movement of the valve uncovers the exhaust port around the valve, thereby causing a decrease in pressure.

Question 4

In the Toyota/Lexus hybrid transaxle, the engine output is coupled to what component of the planetary gearset?

Accepted Answer

A)  sun 
B)  carrier 
C)  ring 
D)  the engine is not directly coupled to any of the planetary gears 
A)  sun 
B)  carrier 
C)  ring 
D)  the engine is not directly coupled to any of the planetary gears

Question 5

Which of the following tools is NOT used to check a TP sensor?

Accepted Answer

A)  voltmeter 
B)  ammeter 
C)  ohmmeter 
D)  lab scope 
A)  voltmeter 
B)  ammeter 
C)  ohmmeter 
D)  lab scope

Question 6

A magnetic pulse generator [PM generator] type sensor is commonly used to measure _____ on an EAT transmission.

Accepted Answer

A)  speed [rpm] 
B)  temperature 
C)  pressure 
D)  all answers are correct 
A)  speed [rpm] 
B)  temperature 
C)  pressure 
D)  all answers are correct

Question 7

Name two TCM outputs.

Accepted Answer

shift solenoids
pressure contr

Question 8

The customer complains of shudder that occurs at light throttle just when the vehicle reaches 45 mph. The shudder lasts for a few seconds then stops until the vehicle slows down and then speeds back up to 45 mph. The problem could be ______.

Accepted Answer

A)  a fouled spark plug 
B)  an arcing ignition wire 
C)  a broken transmission mount 
D)  a defective TCC solenoid 
A)  a fouled spark plug 
B)  an arcing ignition wire 
C)  a broken transmission mount 
D)  a defective TCC solenoid

Question 9

The first step in diagnosing an EAT transmission problem is ______.

Accepted Answer

A)  connect a scan tool and read DTCs 
B)  connect a pressure gauge to the transmission and record line pressure 
C)  manually activate shift solenoids with a jumper wire or transmission tester 
D)  check the adjustment of the TV [throttle valve] cable 
A)  connect a scan tool and read DTCs 
B)  connect a pressure gauge to the transmission and record line pressure 
C)  manually activate shift solenoids with a jumper wire or transmission tester 
D)  check the adjustment of the TV [throttle valve] cable

Question 10

On the Toyota/Lexus automatic transmissions with manual control, drivers must exercise caution when manually shifting to prevent engine or transmission failure.

Accepted Answer

A) True 
 B)False

Question 11

Which of the following statements concerning the operating characteristics of an EAT during limp-in mode is NOT true?

Accepted Answer

A)  The transmission locks in third gear when the gear selector is in the Drive position or second gear when it is in a lower position 
B)  The transmission will remain locked in fourth gear when in Drive 
C)  The transmission will operate only in Park, Neutral, Reverse, and Second gears and will not upshift or downshift 
D)  The transmission will remain in whatever gear it was in but will shift into third or second gear and stay there as soon as the vehicle slows down 
A)  The transmission locks in third gear when the gear selector is in the Drive position or second gear when it is in a lower position 
B)  The transmission will remain locked in fourth gear when in Drive 
C)  The transmission will operate only in Park, Neutral, Reverse, and Second gears and will not upshift or downshift 
D)  The transmission will remain in whatever gear it was in but will shift into third or second gear and stay there as soon as the vehicle slows down

Question 12

If the crankshaft speed sensor reads 1,650 rpm and the TSS (turbine speed sensor) also reads 1,650 RPM, the torque converter is ______.

Accepted Answer

A)  overheating 
B)  in a stall condition 
C)  slipping 
D)  coupled 
A)  overheating 
B)  in a stall condition 
C)  slipping 
D)  coupled

Question 13

How do you diagnose a problem with an electronically controlled transmission that does not set a DTC?

Accepted Answer

Non-DTC problems can be solved with furt

Question 14

The EPC solenoid provides changes in pressure in response to engine load.

Accepted Answer

A) True 
 B)False

Question 15

A DTC for an input signal that is too low or too high can be caused by an internal transmission mechanical or hydraulic failure.

Accepted Answer

A) True 
 B)False

Question 16

Which of the following is NOT an advantage of an electronically controlled transmission?

Accepted Answer

A)  higher torque capacity 
B)  improved fuel economy 
C)  lower exhaust emission levels 
D)  better shift timing 
A)  higher torque capacity 
B)  improved fuel economy 
C)  lower exhaust emission levels 
D)  better shift timing

Question 17

PCM input data such as MAP, TP, and engine speed cannot be transferred to the TCM through the vehicle CAN bus.

Accepted Answer

A) True 
 B)False

Question 18

The TFT sensor is a _____ and its output signal varies with ATF temperature.

Accepted Answer

A)  thermistor 
B)  thermal relay 
C)  Hall-effect switch 
D)  bi-metal relay 
A)  thermistor 
B)  thermal relay 
C)  Hall-effect switch 
D)  bi-metal relay

Question 19

Hydraulically controlled transmissions rely on signals from the ____________________ and ____________________ to force a shift in gears.

Accepted Answer

governor, throttle v

Question 20

The Toyota/Lexus hybrid is driven by MG1 when running solely on electric power.

Accepted Answer

A) True 
 B)False

Exam 42: Electronic Automatic Transmissions

A computer-controlled transmission that starts out in the wrong gear could be caused by ______.

What type of sensor listed here is a potentiometer?

How does a pressure control solenoid regulate transmission pressures?

In the Toyota/Lexus hybrid transaxle, the engine output is coupled to what component of the planetary gearset?

Which of the following tools is NOT used to check a TP sensor?

A magnetic pulse generator [PM generator] type sensor is commonly used to measure _____ on an EAT transmission.

Name two TCM outputs.

The customer complains of shudder that occurs at light throttle just when the vehicle reaches 45 mph. The shudder lasts for a few seconds then stops until the vehicle slows down and then speeds back up to 45 mph. The problem could be ______.

The first step in diagnosing an EAT transmission problem is ______.

On the Toyota/Lexus automatic transmissions with manual control, drivers must exercise caution when manually shifting to prevent engine or transmission failure.

Which of the following statements concerning the operating characteristics of an EAT during limp-in mode is NOT true?

If the crankshaft speed sensor reads 1,650 rpm and the TSS (turbine speed sensor) also reads 1,650 RPM, the torque converter is ______.

How do you diagnose a problem with an electronically controlled transmission that does not set a DTC?

The EPC solenoid provides changes in pressure in response to engine load.

A DTC for an input signal that is too low or too high can be caused by an internal transmission mechanical or hydraulic failure.

Which of the following is NOT an advantage of an electronically controlled transmission?

PCM input data such as MAP, TP, and engine speed cannot be transferred to the TCM through the vehicle CAN bus.

The TFT sensor is a _____ and its output signal varies with ATF temperature.

Hydraulically controlled transmissions rely on signals from the ____________________ and ____________________ to force a shift in gears.

The Toyota/Lexus hybrid is driven by MG1 when running solely on electric power.

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Hydraulically controlled transmissions rely on signals from the and to force a shift in gears.