ENGINE AR 7E0783 - Caterpillar

are two diagnostic indicators that are associated with the interlock electronic control module (ECM). The indicators that are used are the parking brake indicator and the armrest indicator. The indicators will flash when there is a fault in the system.Troubleshooting the ECM may require additional information from the machine Service Manual. The following items may be required.
Electrical System Schematic
Parts Manual
Operation and Maintenance ManualAs a guide, a simplified system schematic is at the end of this manual. For a complete electrical system schematic, see the Electrical System Schematic in the machine Service Manual.When the troubleshooting procedure instructs you to REPAIR THE HARNESS, use the Electrical System Schematic in the machine Service Manual in order to trace the circuit. Perform continuity checks at the connectors in order to locate harness failures. At component connectors, always check the ground circuit. Less than five ohms of resistance is required from the connectors to frame ground. Resistance that is greater than five ohms can cause an incorrect diagnosis of problems. During troubleshooting, inspect all component and harness connections before any component is replaced. If these connections are not clean and tight the connections can cause electrical problems. The problems may be permanent or intermittent. Check that the wires are pushed into the connectors completely. Make sure that the connections are tight before any other tests are made.Repairs of the machine harness should be performed with the wire of the same size. All joints should be soldered. All joints should be tightly taped or all joints should be covered with shrink sleeving. Use 1P-0810 Electrical Tape .Failure of an electrical component can cause the failure of one or more components. Always attempt to find the cause of a problem and correct the problem before replacing a component.Use the screw in the center of the connector in order to remove the connector from the ECM.