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Table 1
Diagnostic Codes for the EPP Relay
J1939 Code Code Description Comments
1075-5 Engine Electric Lift Pump for Engine Fuel Supply : Current Below Normal The Electronic Control Module (ECM) detects a low current condition in the EPP relay circuit.
The warning light will come on. The diagnostic code will be logged.
The ECM is unable to activate the relay for the EPP. The EPP will not operate or the EPP will operate all the time. The engine will not operate.
1075-6 Engine Electric Lift Pump for Engine Fuel Supply : Current Above Normal The ECM detects a high current condition in the EPP relay circuit.
There is a high current condition in the EPP relay circuit for more than 2 seconds.
The warning light will come on. The diagnostic code will be logged.
The ECM is unable to activate the relay for the EPP. The EPP will not operate or the EPP will operate all the time. The engine will not operate. The following background information is related to this procedure:The EPP is used to provide positive fuel pressure to the high-pressure fuel pump. When the keyswitch is turned to the ON position, the ECM will activate the EPP. If the engine is not running, the ECM will deactivate the EPP after 2 minutes.Not all engines are equipped with an EPP. Ensure that the ECM parameters for the EPP are correctly configured for the hardware equipped.There are three different installation configurations:Engines equipped with a single fuel filter and a manual fuel priming pump An EPP is not installed in this system. Set the "Engine Fuel Lift Pump Installation Status" to "Not Installed".Engines equipped with a single fuel filter and an EPP Set the "Engine Fuel Lift Pump Installation Status" to "Installed". Set the "Periodic Fuel Priming Enable Status" to "Enabled".Engines equipped with two fuel filters and an EPP Set the "Engine Fuel Lift Pump Installation Status" to "Installed". Set the "Periodic Fuel Priming Enable Status" to "Disabled".Refer to Systems Operation, Testing and Adjusting for more information on the different types of fuel system installation configurations.
Illustration 1 g06366341
Schematic for the Electric Priming Pump (EPP) relay
During the following procedure, refer to the electrical schematic for the application.Complete the procedure in the order in which the steps are listed.
Table 2
Troubleshooting Test Steps Values Results
1. Inspect Electrical Connectors and Wiring
A. Turn