If your organization has purchased engine diagnostics (ED) hardware for heavy-duty vehicles (such as LMU-4225s with internal JPOD daughterboards in school buses and large trucks), you can view the ED information in Synovia on the J1708/1939 - Heavy Duty screen.

Note: For more information about ED, see An Introduction to Engine Diagnostics.

The data is presented in a grid, with each vehicle's information in a row. To begin, follow these steps:


  1. Click  >> J1708/1939 - Heavy Duty.

    The J1708/1939 - Heavy Duty screen will appear.
      
  2. If you would like to sort the data by a different column (other than the default of by vehicle number), click its column header — for example, to sort by the number of current fault codes, click the Active Fault Codes column header.
    Note: The first click will sort the values in the column in ascending order (lowest to highest). If you click the column header a second time, it will switch the sort order to descending.
  3. Use the scroll bar along the bottom of the grid to view the columns to the right (and the vertical scroll bar to the right to view more vehicles).
     
  4. You can customize the order of the columns and save your layout view as follows:
     
    1. Click and drag a column to the spot where you want it — for example, you can move the Active Fault Codes column to the first spot to the right of the vertical bar after the Vehicle column.
      Note: You can't move any columns to the left of that vertical bar, and you can't move the Vehicle column itself.
    2. Repeat step a for as many columns you'd like to rearrange.
       
    3. After the columns are all in your preferred order, click  at the top right of the screen.
        
      Now, whenever you open the J1708/1939 - Heavy Duty screen, your personalized column order will be displayed.
      Note: If you decide that you no longer want the columns to be ordered according to your saved layout, you can return your view to its original form by clicking  at the top right of the screen.

Many of the column headers are self-explanatory, but it might not be immediately clear what information the following ones contain:


  • ESN: Stands for electronic serial number, a unique identifier for the location messaging unit (LMU) — the GPS device. 
          
  • Last Event Report: The date and time (in local time) the last event was transmitted from the LMU.
     
  • Last Engine Report: The date and time the last ED data was sent.
     
  • Active Fault Codes: The number of fault codes currently being reported.
     
  • MIL Status: Whether the malfunction indicator lamp, usually referred to as the Check Engine light, is lit (On) or not (Off).
     
  • Odometer J1708: The odometer value reported by the engine using the J1708 standard for serial communication.
     
  • Odometer 1939: The odometer value reported by the engine using the J1939 communication standard, which is a newer, more accurate, CAN-based protocol.
     
  • Odometer HiRez 1939: Similar to the Odometer 1939 value but slightly more fine-tuned, sometimes with more digits after the decimal point. 
          
  • Total Engine Hours J1708: The total number of hours the engine has been in operation, as reported via the J1708 standard.
          
  • Total Engine Hours J1939: The total number of hours the engine has been in operation, as reported via the J1939 standard (which will be more accurate than J1708).
     
  • Battery Voltage J1708: The battery voltage value reported via J1708.
     
  • Battery Voltage J1939: The battery voltage value reported via J1939.
     
  • Connected: Whether the LMU is currently connected. This column is designed to be the first place you check if you're not getting the expected ED information; if the device isn't connected, it won't be reporting any data.


See Sorting and Filtering Column Data for information on how to filter the J1708/1939 - Heavy Duty screen so that you see just the data you want.