Heavy Duty Equipment Technician Red Seal Exam Prep · Question
An off-highway truck's automatic transmission is consistently shifting harshly. The engine RPM seems normal. What initial diagnostic step should be considered, after checking fluid level and condition?
Modern automatic transmissions are electronically controlled. Harsh shifting is often managed by the transmission control unit (TCU). Checking for DTCs with a s
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Question: An off-highway truck's automatic transmission is consistently shifting harshly. The engine RPM seems normal. What initial diagnostic step should be considered, after checking fluid level and condition?
Answer options: ✅ Checking for diagnostic trouble codes (DTCs) with a scan tool
- Replacing the transmission's torque converter
- Adjusting the engine's idle speed
- Inspecting the driveline for damage
Correct answer: Checking for diagnostic trouble codes (DTCs) with a scan tool
Explanation: Modern automatic transmissions are electronically controlled. Harsh shifting is often managed by the transmission control unit (TCU). Checking for DTCs with a scan tool is the most efficient initial step to identify electronic faults, sensor issues, or solenoid problems that can cause harsh shifts.
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