Diesel Diagnostic & Electrical Repairs
Diesel Truck Electrical Repairs
Diagnosing and fixing electrical issues can be a challenge on big trucks. Our engine diagnostics experts know how to accurately diagnose and repair your electrical issues so you can get back on the road. We understand that every day your truck is not available, you’re losing money. Our diagnostic equipment is state-of-the-art and once we find the problem we know how to get the repair done fast.
Electrical Repair Warning Signs
Onsite Truck & Trailer Repair specializes in finding solutions for complex, hard-to-diagnose problems. Your truck has systems to alert you to issues, but there are other signs that you should be looking for, and if found, addressed before they become an issue. These include:
- Engine that struggles to start
- Damaged or bloated battery
- Dim or flickering headlights and/or brake lights
- The smell of burnt plastic or wiring
- Cracked, worn, or discolored wiring
- Blown fuses/tubes
Common Types of Diesel Truck Electrical Repairs
In recent years, truck electronics have advanced significantly. Your truck’s performance depends on its electrical system which at times can feel like a complex maze. Onsite’s certified diesel mechanics are familiar with navigating the electrical mazes in big trucks. Some common repairs we help customers with include:
- ECU Unit repair
- Circuit protection device replacement
- Dead battery replacement
- Head and tail light wiring and fuse repair
Check Engine Light Issues
When your check engine light pops on don’t ignore it. It could be something simple like a loose or faulty gas cap or a more severe issue like a bad catalytic converter. Whatever the cause, it’s best not to take a chance of causing significant damage.
Diagnostic Testing & Adjustments
Our shop has the necessary software to not only pinpoint issues, but we can adjust parameters in all engines. If your truck doesn’t seem to be running the way it should, we’ll conduct a diagnostic test to determine the problem. Diagnostic testing can reveal issues in your truck’s engine, transmission, exhaust system, brakes, and other major components.
Engine Control Unit (ECU) Repair
A malfunctioning Engine Control Unit (ECU) is one of the most typical electrical issues with semi-trucks. The ECU controls the timing and fuel injection of the engine, and keeps an eye on the engine’s sensors and emission control mechanism. Your engine won’t operate correctly and stall if the ECU isn’t working properly.
Wiring Repair
Wires get loose and break over time due to your truck’s continuous vibration. This introduces risks like short circuits and even fire. The electrical “noise” that unsecured cables may produce can also interfere with your truck’s onboard computer systems. Compromised circuit protectors can let too much current pass through the electrical system and result in a catastrophic power surge.
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Frequently Asked Questions
How to diagnose a diesel engine?
Diagnosing a diesel engine involves conducting a comprehensive diagnostic test to identify issues in the engine, transmission, exhaust system, brakes, and other major components. The ECU controls the engine's performance and monitors its sensors and emission control mechanism.
What tools are needed for diesel engine diagnosis?
The tools needed for diesel engine diagnosis typically include a diagnostic scanner, multimeter, compression tester, timing light, and other specialized tools to evaluate the engine's performance, electrical systems, and emissions control components.
How to check diesel engine compression pressure?
Checking the compression pressure of a diesel engine involves using a compression tester to measure the pressure in each cylinder, which helps identify any issues with the engine's internal components.
What are common diesel engine fault signs?
Common diesel engine fault signs include engine struggling to start, damaged or bloated battery, dim or flickering headlights/brake lights, smell of burnt plastic or wiring, cracked/worn/discolored wiring, and blown fuses or tubes.
How to interpret diesel engine diagnostic codes?
Interpreting diesel engine diagnostic codes involves understanding the meaning of the codes, which indicate issues with the engine's sensors, emissions control system, or other components. The codes can help identify the specific problem and guide the repair process.
What steps to take for diesel engine troubleshooting?
Diesel engine troubleshooting involves identifying issues such as engine starting difficulties, battery problems, lighting issues, and wiring problems, and addressing them through diagnostic testing to prevent further damage.
How to perform a diesel fuel injector test?
Performing a diesel fuel injector test involves checking the injector's spray pattern, timing, and flow rate to ensure proper function and identify any issues that may impact engine performance.
What are common diesel engine performance issues?
Common diesel engine performance issues include difficulty starting the engine, damaged or bloated battery, dim or flickering lights, burnt wiring smell, cracked or discolored wiring, and blown fuses or tubes.
How to diagnose diesel engine overheating problems?
Diagnosing diesel engine overheating problems involves inspecting the cooling system, identifying any leaks, checking the thermostat, and monitoring the engine temperature to determine the root cause and address it promptly.
What to inspect during a diesel engine diagnosis?
During a diesel engine diagnosis, it is important to inspect the engine's starting ability, battery condition, lighting, wiring, and fuses. Common issues to check include engine starting struggles, damaged batteries, dim or flickering lights, and blown fuses.
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