COVER 3P3703 - Caterpillar

diagnostics for the electronic control modules can be accessed through the Information Display or the Caterpillar Electronic Technician (ET). Troubleshooting the system requires additional information from the Service Manual of the machine. The following list of references should be used to troubleshoot the systems of the machine:Reference: (D8T) Specifications, Systems Operation and Testing and Adjusting, UENR1389Reference: (D9T) Specifications, Systems Operation and Testing and Adjusting, KENR8943Reference: (D8T) Electrical System Schematic, UENR1394Reference: (D9T) Electrical System Schematic, KENR8948Reference: (D8T) Operation and Maintenance Manual, SEBU9087Reference: (D9T) Operation and Maintenance Manual, SEBU8736 As a reference, a simplified system schematic is included at the end of this manual. For an accurate representation of the machine that is being diagnosed, refer to the Electrical System Schematic in the Service Manual of the machine.Reference: Refer to (D8T) Electrical System Schematic, UENR1394Reference: Refer to (D9T) Electrical System Schematic, KENR8948When the troubleshooting procedure instructs you to “REPAIR THE HARNESS OR REPLACE THE HARNESS”, use the Electrical System Schematic in the Service Manual of the machine to trace the circuit. Perform resistance checks at the harness connectors in order to locate harness failures. Always check the ground circuit at the machine harness connector for the components. Less than 5 ohms of resistance is required between the ground contacts of the connector and the frame ground. Excessive ground resistance that is greater than 5 ohms can cause an incorrect diagnosis of the system.During troubleshooting, inspect all harness connections before any component is replaced. If these connections are not clean and tight, permanent electrical problems or intermittent electrical problems may result. Check that the wires are pushed into the connectors completely. Ensure that the connections are tight before other tests are made. Failure of an electrical component may cause the failure of other components. Always attempt to correct the cause of an electrical system failure before you replace a component. If wire insulation is punctured during troubleshooting, repair the damage. Seal the damaged wires with 8T-0065 RTV Silicone Sealant. Cover the sealant with two layers of 1P-0810 Electrical Tape.