Introduction
This course is designed to equip 3P carriers with the knowledge and skills necessary to efficiently troubleshoot and diagnose common issues encountered in truck operations.
Time
This course will take approximately 15 minutes to complete.
Navigating This Course
This course is mobile friendly. You can take it on your phone or on a computer. Select the cards below for tips on taking this course on your phone.
Click the magnifying glass icon (+) to zoom in and click again to return to normal size.
When you see a "CONTINUE" button, select it to unlock the next section of the course.
Rotate your phone for better access to course content.
In this lesson, you’ll read high-level troubleshooting tips for diagnosing engine issues. These lists are not exhaustive and you should consult with an expert if you feel the need to.
Press the (+) icon to learn more.
- Check the air flow to the radiator. Confirm it is not blocked by bugs in good weather or snow and ice in the winter months.
- Confirm all axles are rolling freely and that there are no brakes or tires dragging.
- Inspect the engine fan and belts to verify they are operating properly.
- Check outside air temperature. If the air temperature is very hot and you’re driving, gear down.
- Turn off the air conditioning on steep grades in hot weather, to help keep the engine cool.
- Check the oil and coolant levels when the engine is cool. Check for leaks.
- Check the fuel supply; replace fuel filters.
- Check batteries and connections to starter.
- Inspect the starter motor.
- Check the fuel pump and fuel lines.
- Check the fuel for contamination and change fuel filters.
- Check and clean the air filters; replace if necessary.
- Request a shop check the injectors and engine control module (ECM).
Inspect the exhaust system for leaks, damaged catalytic converters, or clogged mufflers.
Use diagnostic tools to monitor oxygen sensor readings and detect any abnormal exhaust emissions.
- Inspect air filters for blockages or damage. Check the intake manifold for leaks or loose connections.
- Test the Mass Air Flow (MAF) sensor and intake air temperature sensor for accurate readings.
In this lesson, we discuss how to troubleshoot and diagnose transmission systems. Continue reading to learn more!
- Shifting Issues: Check the transmission fluid level and condition. Test the clutch system for proper engagement and disengagement. Use diagnostic tools to monitor transmission sensors and solenoids for any faults.
- Clutch Problems: Inspect the clutch pedal for proper operation and adjust the clutch pedal free play. Check for leaks in the hydraulic clutch system. Test the clutch master cylinder and slave cylinder for proper functioning.
- Gear Slippage: Inspect the transmission fluid level and condition. Check for worn-out clutch discs or damaged gears. Test the transmission control module and sensors for any malfunctions.
In this lesson, we discuss how to troubleshoot and diagnose electrical systems. Continue reading to learn more!
- Dead batteries: Inspect the battery connections for corrosion or loose terminals. Test the battery voltage and check the charging system (alternator) output.
- Faulty connections: Check all electrical connections for loose or corroded terminals. Inspect wiring harnesses for damage. Test fuses and relays for continuity. Use a multi-meter to troubleshoot circuits and test voltage drops.
- Electrical shorts: Inspect wiring harnesses for chafing or exposed wires. Use a multi-meter or circuit tester to locate short circuits. Disconnect components one by one to isolate the faulty circuit.
In this lesson, we discuss how to troubleshoot and diagnose braking systems.
Press each tab to learn more:
Poor Stopping Power
Noise when Braking or Uneven Braking
Poor Stopping Power
- Keep an eye on air pressure levels.
- Check semi-trailer brake linings and hoses.
- Perform a visual inspection of wheel and brake chambers.
- Check Anti-Lock Braking System.
- Evaluate the air dryers.
Noise when Braking or Uneven Braking
- Apply grease to the slack adjusters.
- Inspect and Grease S Cams.
- Perform a visual inspection of wheel and brake chambers.
In this lesson, we discuss how to troubleshoot and diagnose suspension systems. Continue reading to learn more!
- Excessive Bouncing: Inspect shocks or struts for leaks or damage. Check suspension springs for sagging or broken coils. Test the suspension dampening characteristics using diagnostic tools.
- Sagging Suspension: Inspect air suspension components for leaks or damage. Check air compressor operation and airbag pressure. Test the height sensors and suspension control module for any faults.
- Uneven Tire Wear: Inspect tires for signs of uneven wear patterns. Check tire pressure and alignment. Inspect suspension components such as control arms, ball joints, and bushings for wear or damage. Verify the suspension height.
Remember, the troubleshooting techniques provided are general guidelines, and specific troubleshooting steps may vary depending on the truck make, model, and system.
By troubleshooting potential mechanical issues, you help maintain your safety, as well as the public’s safety, and that makes it possible to deliver on our customer promise!
As a result of this course, you should now be able to:
- Identify potential maintenance defects.
- Diagnose maintenance defects.