A heavy-duty loader with an electronically controlled powershift transmission is experiencing intermittent loss of power and erratic shifting. Diagnostic trouble codes (DTCs) point to a 'Transmission Output Speed Sensor' fault. What is the most likely impact of this sensor failure on the transmission's operation?

Question: A heavy-duty loader with an electronically controlled powershift transmission is experiencing intermittent loss of power and erratic shifting. Diagnostic trouble codes (DTCs) point to a 'Transmission Output Speed Sensor' fault. What is the most likely impact of this sensor failure on the transmission's operation?

Answer options: ✅ The transmission control unit (TCU) is unable to accurately determine vehicle speed, affecting shift scheduling and torque converter lock-up.

• The engine management system cannot receive proper signals to regulate fuel injection, leading to power loss.
• The hydraulic system loses pressure due to the sensor's connection to the main pump output.
• The forward and reverse clutches fail to disengage due to a lack of electrical signal from the sensor.

Correct answer: The transmission control unit (TCU) is unable to accurately determine vehicle speed, affecting shift scheduling and torque converter lock-up.

Explanation: A transmission output speed sensor provides crucial data to the Transmission Control Unit (TCU) about the machine's ground speed. Without this accurate information, the TCU cannot properly schedule shifts, engage or disengage the torque converter lock-up clutch, or manage transmission pressure, leading to erratic shifting and perceived power loss as the transmission struggles to operate efficiently. It directly impacts transmission control, not engine fuel injection, main hydraulic pressure, or direct clutch engagement without TCU input.