Question 1

What is the source address (SA)of the transmission ECU on the J1939 data bus?

Accepted Answer

A)  00 
B)  01 
C)  02 
D)  03 
A)  00 
B)  01 
C)  02 
D)  03

Question 2

Technician A says that an Allison TC10 splits input torque between a pair of countershafts.Technician B says that it is possible to transmit output torque from a TC10 bypassing the gearbox module.Who is correct?

Accepted Answer

A)  Technician A only 
B)  Technician B only 
C)  Both A and B 
D)  Neither A nor B 
A)  Technician A only 
B)  Technician B only 
C)  Both A and B 
D)  Neither A nor B

Question 3

When does an Allision WT transmission use fast adaptive mode?

Accepted Answer

A)  when it has close-ratio gearing 
B)  when it has standard gear ratios 
C)  when programmed to do so after a rebuild 
D)  whenever hard acceleration is required 
A)  when it has close-ratio gearing 
B)  when it has standard gear ratios 
C)  when programmed to do so after a rebuild 
D)  whenever hard acceleration is required

Question 4

When Allison WT drop-box output is split between the front and rear axles,how much of the available torque would normally go to the front axle?

Accepted Answer

A)  70% 
B)  600% 
C)  50% 
D)  30% 
A)  70% 
B)  600% 
C)  50% 
D)  30%

Question 5

How many ranges are overdrive ratios in a 6-speed World Transmission?

Accepted Answer

A)  none 
B)  1 
C)  2 
D)  3 
A)  none 
B)  1 
C)  2 
D)  3

Question 6

When using a DMM in resistance mode across terminals Cand D on a 9-pin J1939 receptacle,40 ohms is displayed on the meter.Which of the following is most likely?

Accepted Answer

A)  One missing terminating resistor 
B)  Both terminating resistors missing 
C)  Three terminating resistors on the bus 
D)  The bus is down 
A)  One missing terminating resistor 
B)  Both terminating resistors missing 
C)  Three terminating resistors on the bus 
D)  The bus is down

Question 7

Which of the following statements accurately describe primary and secondary modulation of solenoids in a WT transmission?

Accepted Answer

A)  primary modulation controls on-time at a frequency of 63 Hz 
B)  secondary modulation maintains an optimal current flow at 7,812 Hz 
C)  primary modulation has a variable duty cycle 
D)  all of the above 
A)  primary modulation controls on-time at a frequency of 63 Hz 
B)  secondary modulation maintains an optimal current flow at 7,812 Hz 
C)  primary modulation has a variable duty cycle 
D)  all of the above

Question 8

Which of the following are serial communications interface (SCI)inputs to the WT electronics?

Accepted Answer

A)  transmission tailshaft speed 
B)  transmission sump temperature 
C)  throttle position 
D)  range position 
A)  transmission tailshaft speed 
B)  transmission sump temperature 
C)  throttle position 
D)  range position

Question 9

After the maximum number of codes are logged in a WT ECU,what happens to new codes that are detected?

Accepted Answer

A)  added and the oldest non-active code is dropped 
B)  if all codes are active,the lowest-priority code is dropped 
C)  new code cannot be added until existing codes are retrieved 
D)  both A and B 
A)  added and the oldest non-active code is dropped 
B)  if all codes are active,the lowest-priority code is dropped 
C)  new code cannot be added until existing codes are retrieved 
D)  both A and B

Question 10

In the event of a total loss of electrical supply to a World Transmission,what would result?

Accepted Answer

A)  cease to function 
B)  revert to hydromechanical operation 
C)  default to limp home mode 
D)  both B and C 
A)  cease to function 
B)  revert to hydromechanical operation 
C)  default to limp home mode 
D)  both B and C

Question 11

When ordering parts for any WT transmission,what information must be communicated accurately to identify the transmission?

Accepted Answer

A)  vehicle OEM,model,and year of manufacture 
B)  all 17 characters from the vehicle VIN 
C)  transmission model,serial,and part numbers 
D)  transmission model and the date placed in service 
A)  vehicle OEM,model,and year of manufacture 
B)  all 17 characters from the vehicle VIN 
C)  transmission model,serial,and part numbers 
D)  transmission model and the date placed in service

Question 12

What is required to access DTCs in an Allison ECAT?

Accepted Answer

A)  ET 
B)  DMM 
C)  DDD 
D)  DOC 
A)  ET 
B)  DMM 
C)  DDD 
D)  DOC

Question 13

Which of the following correctly describes the two output options of the output module on the Allison TC-10?

Accepted Answer

A)  low range and direct drive 
B)  underdrive and overdrive 
C)  low range and high range 
D)  deep reduction and low reduction 
A)  low range and direct drive 
B)  underdrive and overdrive 
C)  low range and high range 
D)  deep reduction and low reduction

Question 14

In which of the three Allison TC10 modules is a single planetary gearset located?

Accepted Answer

A)  Torque conveter module 
B)  Input module 
C)  Gearbox module 
D)  Output module 
A)  Torque conveter module 
B)  Input module 
C)  Gearbox module 
D)  Output module

Question 15

A solenoid that requires a momentary voltage source to change position,then holds position and requires reverse current pulse to revert to its original position known as?

Accepted Answer

A)  Latching solenoid 
B)  Non-latching solenoid 
C)  pulse actuator 
D)  induction sensor 
A)  Latching solenoid 
B)  Non-latching solenoid 
C)  pulse actuator 
D)  induction sensor

Question 16

On an Allison TC10,what do the 4th and 9th ratio options have in common?

Accepted Answer

A)  torque is split evenly though the countershafts 
B)  torque is multiplied through the countershafts 
C)  torque is routed through the left countershaft 
D)  input torque bypasses both countershafts to the output module 
A)  torque is split evenly though the countershafts 
B)  torque is multiplied through the countershafts 
C)  torque is routed through the left countershaft 
D)  input torque bypasses both countershafts to the output module

Question 17

How many planetary gearsets are there in an Allison TC10 ECAT?

Accepted Answer

A)  None 
B)  One 
C)  Two 
D)  Three 
A)  None 
B)  One 
C)  Two 
D)  Three

Exam 21: Electronically Controlled Automatic Transmissions Ecats

What is the source address (SA)of the transmission ECU on the J1939 data bus?

Technician A says that an Allison TC10 splits input torque between a pair of countershafts.Technician B says that it is possible to transmit output torque from a TC10 bypassing the gearbox module.Who is correct?

When does an Allision WT transmission use fast adaptive mode?

When Allison WT drop-box output is split between the front and rear axles,how much of the available torque would normally go to the front axle?

How many ranges are overdrive ratios in a 6-speed World Transmission?

When using a DMM in resistance mode across terminals Cand D on a 9-pin J1939 receptacle,40 ohms is displayed on the meter.Which of the following is most likely?

Which of the following statements accurately describe primary and secondary modulation of solenoids in a WT transmission?

Which of the following are serial communications interface (SCI)inputs to the WT electronics?

After the maximum number of codes are logged in a WT ECU,what happens to new codes that are detected?

In the event of a total loss of electrical supply to a World Transmission,what would result?

When ordering parts for any WT transmission,what information must be communicated accurately to identify the transmission?

What is required to access DTCs in an Allison ECAT?

Which of the following correctly describes the two output options of the output module on the Allison TC-10?

In which of the three Allison TC10 modules is a single planetary gearset located?

A solenoid that requires a momentary voltage source to change position,then holds position and requires reverse current pulse to revert to its original position known as?

On an Allison TC10,what do the 4th and 9th ratio options have in common?

How many planetary gearsets are there in an Allison TC10 ECAT?

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