Professional automatic transmission diagnostics
Professional diagnostics of an automatic transmission (AT) is the most important step for proper repair or maintenance. Here’s an overview of the process:
1. Visual inspection
* Check for leaks or other physical damage to the automatic transmission housing, oil pan and cooling lines.
* Inspect connectors and wiring harnesses for signs of corrosion or damage.
2. Reading fault codes
* Connecting a trouble code scanner to the vehicle diagnostic port.
* Reading fault codes stored in the automatic transmission control module (TCM).
* Interpret codes to determine specific fault area.
3. Checking the fluid level and quality
* Check the transmission dipstick or drain plug to determine the fluid level.
* Measurement of liquid temperature to compare it with set values.
* Analyze the color and odor of the fluid to detect signs of contamination or overheating.
4. Mechanical check
* Perform a test drive and observe the operation of the automatic transmission in all gear ranges.
* Check for smooth shifting, response time, and presence of noise or vibration.
* Using a pressure gauge to check fluid pressure in various operating modes.
5. Electrical check
* Check battery voltage and ground connections.
* Diagnostics of solenoid valves, speed sensors and other electrical components.
* Resistance and voltage measurements to confirm proper circuit operation.
6. Checking the hydraulic system
* Inspect the hydraulic pump, valve body and torque converter for signs of wear or damage.
* Check fluid pressure and flow to ensure compliance with specifications.
7. Data analysis
* Collect all collected data and analyze it thoroughly to identify the root cause of the problem.
* Use of technical documentation and database for reference and repair manual.
8. Diagnostic report
* Produce a detailed diagnostic report, including the results of all tests and recommendations for repair or maintenance.
* Providing a report to the vehicle owner for review and making informed decisions.
Professional automatic transmission diagnostics require special knowledge, equipment and experience. By entrusting this important task to qualified professionals, you can guarantee an accurate diagnosis and professional repair.