The DSE controller has detected a failure in the engine CAN bus communications link to the engine ECU.

Possible causes:

• Open or short in one of the two sections of the CAN bus wiring harness connecting the generator controller to the engine ECU.

• CAN bus wiring harness connectors not fully secured into the T-connector (located near the generator relay boxes). In order for the CAN bus link to be reliable, the connector locking tabs have to be fully engaged. An audible click should be heard when the tab engages.

Items to check:

• Thoroughly inspect both sections of the CAN bus ECU wiring harnesses, including the T-connector that is used to couple the two harnesses.

• Check the CAN bus wiring harness connections at the back of the generator controller.
• Check that the engine ECU connector is fully secured and torqued to the manufacturers’ specification. Inspect the CAN bus cable wiring into the ECU connector.

The engine ECU has detected a critical, immediate shutdown condition from one or more of the engine sensors and has been read by the generator controller over the CAN bus communications link to the engine ECU.

Sample engine condition that would trigger an ECU red alarm:

Low fuel pressure will cause the engine to shutdown if the pressure falls below the threshold factory set by the engine manufacturer.

NOTE  A diagnostic trouble code (DTC) may or may not be displayed on the generator controller along with the ECU red alarm (see note under ECU amber warning).

The engine speed has reached or exceeded the threshold configured in the DSE controller.

Possible causes:

• Engine runaway caused by foreign fuel introduced into the engine air intake system.
• Sudden removal of an excessively large load.
• Problems or failure with an engine component such as fuel pump, injectors or Engine ECU. Review unit for fault codes.

The engine speed has reached or fallen below the threshold configured in the DSE controller.

Possible causes:

• Loss of engine power.
• Overloaded generator, e.g. motor starting.

The engine coolant temperature has reached or exceeded the threshold setup in the generator controller.

Possible causes:

• Low coolant level
• Inadequate air flow through radiator or the generator
• Faulty radiator cap
• Issue with fan motor or electronic controller
• Faulty thermostat

The engine oil pressure has reached or fallen below the threshold configured in the generator controller.

Possible causes:

• Low oil level. Ensure the level is correct on the engine dipstick.
• Incorrect oil specification. Ensure the correct oil is used according to the engine manufacturer’s specifications.
• Clogged or incorrect oil filters.
• Excessively overfilled engine crankcase that can lead to aerated oil, resulting in decreased pressure.

The emergency stop button has been pressed, effectively disconnecting power to the engine ECU and resulting in engine shutdown.

Possible causes:

• E-stop switch pressed.
• Engine disconnect switched off.
• E-stop fuse blown.
• ECU power fuse blown.
• Faulty wire or terminal connection on the relay wiring harness connectors.
• Faulty ENG ECU relay or E-stop feedback relay or relay connections / terminals in corresponding generator relay box (inspect the relays and wiring connections to the relays).

The frequency of the generator has reached or exceeded the threshold configured in the DSE controller.

Possible causes:

• Sudden removal of large load.
• Engine runaway / overspeed condition caused by a foreign fuel source introduced into the engine air intake.