RING-WEAR 8T5668 - Caterpillar

Use this procedure to troubleshoot the electrical system if a problem is suspected with a prelubrication system. Also, use this procedure if one of the diagnostic codes in Table 1 is active or easily repeated.
Table 1
Diagnostic Codes Table
J1939 Code and Description Conditions which Generate this Code System Response
4210-5 Engine Pre-lube Drive : Current Below Normal The engine Electronic Control Module (ECM) detects an open in the circuit for the prelubrication relay.
The ECM detects a short to battery voltage in the circuit for the prelubrication relay. The code is logged.
4210-6 Engine Pre-lube Drive : Current Above Normal The ECM detects a short in the circuit for the prelubrication relay. The ECM can lubricate the engine before cranking begins. This engine prelubrication is used to increase the life of certain engine parts by lubricating these parts before the starting motor is engaged.There are configuration parameters that define the operation of the prelubrication system. Prior to troubleshooting problems that are associated with the prelubrication system, check the settings of these parameters. Be sure that you understand the proper operation of the system. The status of the prelubrication system may be communicated to different controllers that are on the application. Depending on the status that is communicated there could be an effect on the engine starting. Some of these status indicators report the parameter settings of the prelubrication system. The ECM determines the charge pressure status via the engine oil pressure sensor.The prelubrication system is activated at ECM powerup. The ECM prevents the starting motor from engaging while the pump builds pressure in the lubrication system.Also, a manual prelube switch may be wired to P1-60 terminal at the primary ECM connector. When this ECM input is grounded, the ECM will activate the prelubrication relay.An override for the prelubrication system is available in Caterpillar Electronic Technician (ET). The override allows the technician to activate the prelubrication system for service and testing. The test is functional only when the engine speed is zero rpm. The test is accessed by selecting the following menus on Cat ET:
"Diagnostics"
"Diagnostic Tests"
"Override Parameters"
Illustration 1 g02974656
Schematic for the prelubrication system
Illustration 2 g01284151
Location of the terminals at the P1 ECM connector for the prelubrication system
(P1-12) Prelubrication relay
Illustration 3 g01284152
Location of the terminals at the P2 ECM connector for the prelubrication system
(P2-14) Digital return
Illustration 4 g03035987
Location of the terminals at the EL-C3 connector
(Terminal 20) Digital return
(Terminal 30) Relay
Illustration 5 g01284372
Location of the terminals at the prelubrication relay
(7) Blade terminals for the control circuit at the prelubrication relay
(8) Terminal bolts for the secondary circuit at the prelubrication relay
Illustration 6 g01155187
Locations of the terminals at the harness connector for the prelubrication relay
(Terminal 1) Prelubrication relay
(Terminal 2) Digital return
Table 2
Troubleshooting Test Steps Values Results
1. Inspect the Electrical Connectors and the Wiring
A. Turn the main disconnect switch to the OFF position.
B. Thoroughly inspect the ECM connectors. Also, thoroughly inspect the other connectors for the prelubrication relay that are in the circuit. Refer to Troubleshooting, "Electrical Connectors - Inspect" for the proper procedure for inspecting the connectors and the wiring.
C. Perform a 45