GASKET KIT 1402381 - Caterpillar

Use this procedure to troubleshoot the relay for the Electric Fuel Lift Pump (EFLP). Use this procedure if there is a suspected electrical fault with the EFLP.This procedure covers the following diagnostic codes:
Table 1
Diagnostic Codes for the EFLP Relay
J1939 Code CDL Code Code Description
(code descriptions may vary) Comments
1075-5 3666-5 Engine Electric Lift Pump for Engine Fuel Supply : Current Below Normal The Electronic Control Module (ECM) detects the following conditions:
There are no active 168 diagnostic codes.
The ECM is not attempting to power the relay or there is an open circuit.
The ECM has been powered for at least 2 seconds.
There is a low current condition in the EFLP relay circuit or wiring 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 EFLP or power the pump. The EFLP will not operate or the EFLP will operate all the time. The engine will not operate.
1075-6 3666-6 Engine Electric Lift Pump for Engine Fuel Supply : Current Above Normal The ECM detects the following conditions:
There are no active 168 diagnostic codes.
The ECM is attempting to power the relay or the EFLP.
The ECM has been powered for at least 2 seconds.
There is a high current condition in the EFLP relay circuit or a short circuit in the wiring 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 EFLP or power the pump. The EFLP will not operate or the EFLP will operate all the time. The engine will not operate.
The ECM will continue to attempt to activate the relay or power the pump. If the current is OK for 6 seconds, then the diagnostic code will be cleared. The following background information is related to this procedure:The EFLP 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 EFLP. If the engine is not running, the ECM will deactivate the EFLP after 2 minutes. The circuit may contain an EFLP relay or the ECM may power the EFLP directly
Illustration 1 g06045505
Schematic for the Electric Fuel Lift Pump (EFLP) without a relay
Illustration 2 g03794110
Schematic for the Electric Fuel Lift Pump (EFLP) with a 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 the keyswitch to the OFF position.
B. Thoroughly inspect the connectors between the EFLP relay and the engine ECM. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
C. Perform a 45 N (10 lb) pull test on each of the wires in the ECM connector that are associated with the EFLP relay.
D. Check the screw for the ECM connector for the correct torque of 6 N m (53 lb in).
E. Check the harness and wiring for abrasion and for pinch points