10 Questions
What is the first step in diagnosing automatic transmission/transaxle problems?
Verifying the customer's concern by asking detailed questions
What should be checked before test driving a vehicle to diagnose transmission problems?
The level and condition of the transmission fluid
If a vehicle is not moving in drive or reverse, what is the likely cause of the problem?
Mechanical issue
Which tool can be used to command shifts and diagnose automatic transmission problems?
A scan tool
What is the purpose of test driving the vehicle under the same conditions that the owner noticed the problem?
To identify the source of the problem
What can cause transmission problems that should be repaired before diagnosing the transmission?
A weak or missing engine cylinder
Which sensor can provide vehicle speed information for diagnosing transmission problems?
ABS wheel speed sensor
What can technical service bulletins (TSBs) provide for vehicle repairs?
Up to 30% of the solution to the problem
What information is needed to accurately search for relevant TSBs?
The make, model, and year of the vehicle
What is the benefit of following recommended steps from service information when diagnosing transmission problems?
It saves time and money
Study Notes
- To diagnose automatic transmission/transaxle problems, first verify the customer's concern by asking detailed questions.
- Check the level and condition of the transmission fluid before test driving the vehicle.
- If the vehicle does not move in drive or reverse, the problem is likely mechanical and may require removal for repair.
- If the vehicle moves but does not shift correctly, the problem is likely electrical or hydraulic.
- Test drive the vehicle under the same conditions that the owner noticed the problem.
- Use all gear selections to identify the source of the problem.
- Automatic transmission test tools or scan tools can be used to command shifts and diagnose problems.
- Check for diagnostic trouble codes (DTCs) stored in the vehicle computer.
- A weak or missing engine cylinder can cause transmission problems, so repair any engine issues first.
- Scan data can provide information about sensors and components to assist in diagnosing transmission problems.
- Airflow at idle should be within 20% of engine displacement
- Vehicle speed sensor can come from ABS wheel speed sensors, transmission output speed sensor, or dedicated sensor
- Check for normal idle speed and proper voltage/current of shift solenoids
- Scan tool can check engine operation values and inputs affecting transmission
- Technical service bulletins (TSBs) can help with up to 30% of vehicle repairs
- Technician needs make, model, year, engine size and VIN, transmission type, emissions, build date, and current/soft codes for accurate TSB search
- TSBs often include information on solving problems with stored codes
- Service information is like getting advice from an experienced technician
- Following recommended steps from service information can increase chances of finding problem
- Scan data confirming computer command doesn't mean solenoids are working correctly
Test your knowledge of automatic transmission troubleshooting with this informative quiz. Learn about important steps to take when diagnosing transmission problems, such as checking fluid levels and using diagnostic tools. Discover the role of technical service bulletins (TSBs) in identifying common issues and find out how following recommended steps can increase the chances of finding the problem. This quiz is perfect for mechanics and DIY enthusiasts alike who want to expand their knowledge and expertise in automatic transmission repair. Keywords: automatic transmission, troubleshooting, diagnostic tools,
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