Diesel Truck Engine and Electrical Troubleshooting Tips
Explore common issues faced by diesel trucks - low power, misfire codes, and communication problems with ECM. Learn about potential causes and solutions for each problem. Discover the right tools and techniques for effective diagnostics and repairs.
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Presentation Transcript
A diesel truck equipped with a JWAC (Jacket Water Aftercooler) has low power under load. Which of the following could be the cause? B A Leaking JWAC (Jacket Water Aftercooler) Leak in turbocharger inlet piping D C Open in EGR sensor circuit Using an off road grade of fuel > > tekhnologic
Tool identification? Which of the following is a Gouge B A D C > > tekhnologic
A medium duty truck using a HEUI (hydraulically actuated electronically controlled unit injector) fuel system has a misfire code when hot. Technician A says worn HEUI injectors could be the cause. Technician B says a shorted glow plug could be the cause. Who is right? B A A only B only D C Both A and B Neither A or B > > tekhnologic
The technician gets an infinite ohms reading on the ohmmeter function of the DMM (Digital Multimeter), when measuring resistance in a circuit. Which of the following could be the cause? B A Corroded terminal Circuit is complete D C Circuit is open Circuit is in operation > > tekhnologic
Technician A says you do not have to solder a repaired wire. Technician B says wire insulation damage is sometimes found where the wire passes through an opening in a metal part. Who is right? B A A only A and B D C Neither A or B B only > > tekhnologic
The engine cranks on a diesel, but will not start. During diagnosis, the ECM (Electronic Control Module) will not communicate with the diagnostic tool. What is the MOST LIKELY cause? B D F A C E Low ECM supply voltage Failed data link connector High ECM supply voltage Incorrect diagnostic tool software No ECM supply voltage Outdated diagnostic tool software > > tekhnologic
Which of the following measuring tools is MOST likely used to measure the temperature of the diesel exhaust gases? B D F H A C E G Exhaust pyrometer Exhaust manometer Diagnostic scan too MDI (Multiple Diagnostic Interface) OBD II & CAN Deluxe Scan Too Dual MDI (Multiple Diagnostic Interface) Contact Infrared Thermometer Tachometer > > tekhnologic
