Question 1

When removing an inertia brake from an Eaton AMT,which of the following must be done first?

Accepted Answer

The answer of When removing an inertia brake from an...

Question 2

Technician A says that a self-adjusting,system-actuated clutch is used with a ZF Meritor FreedomLine transmission.Technician B says that Mercedes AGS troubleshooting is performed using Freightliner ServicePro software.Who is correct?

Accepted Answer

Technician A is correct because the ZF Meritor FreedomLine transmission does indeed use a self-adjusting, system-actuated clutch, which is designed to automatically maintain the optimal clutch pedal free play. Technician B is also correct because Mercedes AGS (Automated Gear Shift) system troubleshooting can be performed using Freightliner ServicePro software, which is a diagnostic tool used for various systems in Freightliner trucks, including those equipped with Mercedes AGS transmissions.

Question 3

Technician A says that the first step in troubleshooting Eaton AMT complaints should always be to identify any logged fault codes.Technician B says that an AutoShift pretest requires that the technician check the electrical and pneumatic inputs to the transmission before progressing to more detailed troubleshooting.Who is correct?

Accepted Answer

The answer of Technician A says that the first step...

Question 4

Which of the following AMTs are two-pedal systems?

Accepted Answer

All the mentioned AMTs (Automated Manual Transmissions) - UltraShift, Mercedes AGS, and FreedomLine - are two-pedal systems, meaning they do not require the driver to manually operate a clutch pedal.

Question 5

What is used to change the direction that rail select or gear select motors turn at in an Eaton AMT?

Accepted Answer

DC polarity is used to change the direction that rail select or gear select motors turn in an Eaton Automated Manual Transmission (AMT). Changing the polarity of the DC current supplied to the motor reverses its rotation direction.

Question 6

Which SA on a J1939 chassis data bus is assigned to the transmission electronics?

Accepted Answer

The Source Address (SA) for transmission electronics on a J1939 chassis data bus is 03. J1939 standard assigns specific source addresses to different types of devices to ensure proper communication and data exchange across the network.

Question 7

Technician A says that an in-place fallback could mean the transmission remains stuck in neutral.Technician B says that an in-place fallback could mean the transmission remains stuck in a specific gear ratio.Who is correct?

Accepted Answer

An in-place fallback is a safety mechanism in transmissions that allows the transmission to either stay in a neutral state or lock into a specific gear ratio if there's a problem. This ensures the vehicle can either safely coast to a stop or continue moving at a fixed speed, enhancing safety. Therefore, both Technician A and Technician B are correct.

Question 8

Technician A says that Eaton electronics power up all transmission sensors at V-Bat.Technician B says that the Hall-effect sensors used to signal shift rail position require a 5-volt V-Ref input.Who is correct?

Accepted Answer

The answer of Technician A says that Eaton electronics power...

Question 9

What servo force is used to engage an Eaton AMT inertia brake?

Accepted Answer

The Eaton Automated Manual Transmission (AMT) inertia brake is engaged using air pressure. This system utilizes pneumatic force to engage the brake, which is essential for the operation of the AMT during gear shifts.

Question 10

What is used to signal rail position in early versions of AutoShift AMTs?

Accepted Answer

Potentiometers are used in early versions of AutoShift Automated Manual Transmissions (AMTs) to signal rail position. They provide a variable resistance that changes with the position of the gear shift, allowing the transmission control unit to determine the gear position.

Question 11

Technician A says that the inertia brake used on RoadRanger AMTs is located on the underside of the transmission.Technician B says that the inertia brake is hydraulically actuated.Who is correct?

Accepted Answer

The answer of Technician A says that the inertia brake...

Question 12

When a five-speed fallback condition has occurred which of the following is true?

Accepted Answer

When a five-speed fallback condition occurs, it typically means there is a fault in the auxiliary section of the transmission, the main section remains fully operational, and shifting is limited to 5-speeds. This allows the vehicle to continue operating under a reduced functionality mode until repairs can be made.

Question 13

Technician A says that multiplexing enables the transmission and engine to precisely synchronize engine and transmission shaft speeds for shift events.Technician B says that multiplexing communication betwen the engine and transmission makes the clutch unnecessary in AMTs.Who is correct?

Accepted Answer

Multiplexing allows for efficient communication between different vehicle systems, such as the engine and transmission, enabling precise synchronization of shaft speeds during shifts. However, it does not eliminate the need for a clutch in Automated Manual Transmissions (AMTs); the clutch is still required for engaging and disengaging the engine from the transmission.

Question 14

Technician A says that in downshift fallback mode,AutoShift only permits downshifts.Technician B says that when a transmission is in downshift fallback mode,it cannot be shifted out of neutral.Who is correct?

Accepted Answer

Both A and B are correct because in downshift fallback mode, AutoShift only permits downshifts and the transmission cannot be shifted out of neutral.

Question 15

Technician A says that in the event of a loss of chassis electricity,an Eaton AMT will default to mechanical operation.Technician B says that so long as the engine continues to run,the output shaft on an Eaton AMT must rotate.Who is correct?

Accepted Answer

Eaton Automated Manual Transmissions (AMTs) do not default to mechanical operation in the event of a loss of chassis electricity; they require electrical power to operate the shift actuation and clutch control. If the electrical power is lost, the transmission cannot shift automatically. Technician B's statement is also incorrect because the output shaft rotation depends on the transmission being in gear and the clutch being engaged; if the transmission is in neutral or the clutch is disengaged, the output shaft may not rotate even if the engine is running.

Question 16

What is used to stop the countershafts for a shift in a RoadRanger AMT if the clutch is either defective or out of adjustment?

Accepted Answer

The inertia brake is used to stop the countershafts for a shift in a RoadRanger Automated Manual Transmission (AMT) if the clutch is either defective or out of adjustment, ensuring smooth gear transitions.

Question 17

What is the creep feature used on an Eaton wet clutch known as?

Accepted Answer

The creep feature on an Eaton wet clutch is known as "Urge-to-Move." This feature allows the vehicle to automatically and slowly move forward or backward when the engine is idling and the transmission is in gear, without the need for the driver to press the accelerator pedal.

Question 18

Technician A says that Eaton GEN III electronics will prevent a driver from making a shift that could result in transmission damage.Technician B says that when an Eaton AMT service light flashes a code 25,the transmission should be immediately pulled from service.Who is correct?

Accepted Answer

Technician A is correct because Eaton GEN III electronics are designed to protect the transmission from damage by preventing shifts that could be harmful, enhancing the durability and reliability of the transmission system. Technician B's statement about a code 25 requiring immediate removal of the transmission from service is not accurate; typically, diagnostic codes prompt specific troubleshooting procedures rather than immediate removal from service.

Question 19

What gear oil is recommended by Eaton for use in their AMTs?

Accepted Answer

Eaton recommends synthetic E-500 gear oil for use in their Automated Manual Transmissions (AMTs). This type of oil is specifically formulated to meet the demanding requirements of AMTs, offering superior protection and performance.

Question 20

Technician A says that the first generation of Eaton AMTs used a two module transmisson control system.Technician B says that current versions of Eaton AMTs use a single ECU to manage all transmission functions.Who is correct?

Accepted Answer

The first generation of Eaton Automated Manual Transmissions (AMTs) indeed used a two-module transmission control system, as stated by Technician A. Over time, advancements in technology allowed for the integration of these functions into a single Electronic Control Unit (ECU), as mentioned by Technician B. This evolution in design simplifies the system and improves efficiency.

Quiz 20: Electronically Automated Standard Transmissions