9469200994 Rev — 33
DGC-2020ES Troubleshooting
Troubleshooting
If you do not get the results that you expect from the DGC-2020ES, first check the programmable settings
for the appropriate function. Use the following troubleshooting procedures when difficulties are
encountered in the operation of your genset control system.
Communications
USB Port Does Not Operate Properly
Step 1. Verify that the proper port of your computer is being used. For more information, refer to the
Communication chapter in the Configuration manual.
CAN Communication Does Not Operate Properly
Step 1: Verify that there is a 120-ohm termination resistor on each end of the bus section of the wiring,
and that there are not any termination resistors at any node connections that are on stubs from
the main bus.
Step 2: Check all CAN wiring for loose connections and verify that the CAN H and CAN L wires have
not gotten switched somewhere on the network.
Step 3: Verify that the cable length of the bus section of the wiring does not exceed 40 meters (131
feet), and verify that any stubs from the main bus do not exceed 3 meters (9.8 feet) in length.
Step 4: If the engine is equipped with a Volvo or MTU ECU, verify that the ECU Configuration setting is
set to match the actual ECU configuration.
Inputs and Outputs
Programmable Inputs Do Not Operate as Expected
Step 1. Verify that all wiring is properly connected. Refer to the Typical Connections chapter.
Step 2. Confirm that the inputs are programmed properly.
Step 3. Ensure that the input at the DGC-2020ES is actually connected to the BATT– terminal (17).
Programmable Outputs Do Not Operate as Expected
Step 1. Verify that all wiring is properly connected. Refer to the Typical Connections chapter.
Step 2. Confirm that the outputs are programmed properly.
Metering/Display
Incorrect Display of Battery Voltage, Coolant Temperature, Oil Pressure, or Fuel Level
Step 1. Verify that all wiring is properly connected. Refer to the Typical Connections chapter.
Step 2. Confirm that the SENDER COM terminal (2) is connected to the negative battery terminal and
the engine-block side of the senders. Current from other devices sharing this connection can
cause erroneous readings.
Step 3. If the displayed battery voltage is incorrect, ensure that the proper voltage is present between
the BATT+ terminal (18) and the SENDER COM terminal (2).
Step 4. Verify that the correct senders are being used.
Step 5. Use a voltmeter connected between the BATT– terminal (17) and the SENDER COM terminal
(2) on the DGC-2020ES to verify that there is no voltage difference at any time. Any voltage
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