Using the JPRO Heavy Truck Diagnostic Scanner on a 2015 Freightliner with a Detroit Engine

Hello everyone, Tyler here with a new tutorial. Today, we’re diving into how to use the JPRO Heavy Truck Diagnostic Scanner Tool on a 2015 Freightliner equipped with a Detroit engine. This robust tool offers extensive capabilities for diagnosing and troubleshooting directly from your laptop.

Equipment Setup:

  • Diagnostic Link Adapter (DLA) 2.0: Connected to the truck’s diagnostic port.
  • Laptop: Linked to the DLA via cable.

Getting Started:

  1. Connect the Tool:
    • With the DLA connected, initiate the connection on your laptop by clicking the ‘Connect’ button. Connection typically establishes within 45 seconds, swiftly linking to the vehicle’s system.
  2. Dashboard Interface:
    • Upon connection, the dashboard populates with various modules of the vehicle. You can view all diagnostic codes centrally displayed, making it easy to navigate and select specific modules like the engine for detailed diagnostics.

Diagnosing and Troubleshooting:

  1. Filter and Diagnose Error Codes:
    • Choose the Detroit engine module to filter relevant error codes.
    • For demonstration, let’s decode SPM 168, SMI 18:
      • Navigate to ‘DTC Solutions’ and select the Detroit engine.
      • Enter the code “168” in the search bar to directly find related issues, such as “battery voltage low,” offering direct troubleshooting guidance.
  2. Bi-Directional Commands:
    • Access bi-directional control features to perform tasks like setting speed limits, cruise control adjustments, and initiating DPF park regeneration.
    • For heavy trucks, the tool supports a range of commands except for certain specific ones like Caterpillar.
  3. Perform DPF Regeneration:
    • The tool provides a detailed view of the DPF system, displaying sensor values and system statuses.
    • To start a DPF regeneration, simply select the appropriate command and follow the prompts.

Additional Functionalities:

  • ABS Testing:
    • JPRO allows for testing and toggling ABS functionality, showing how to activate or deactivate system lights directly from the tool.
  • Complete Health Reports:
    • Generate comprehensive vehicle health reports detailing every aspect of the vehicle’s status, providing a thorough check-up.
  • Real-Time Data Monitoring:
    • Monitor live data for ongoing vehicle operations, enhancing diagnostic precision.


The JPRO Heavy Truck Diagnostic Scanner is an invaluable tool for heavy-duty truck diagnostics, offering a wide array of features from error code troubleshooting to active command functionalities. Its user-friendly interface and quick setup make it ideal for professionals seeking comprehensive vehicle insights.

Stay tuned for more tutorials and deep dives into other models and functionalities of this versatile diagnostic tool.

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