SLIDER AS 2W0148 - Caterpillar

the Electronic Monitoring System (EMS) requires additional information from the machine Service Manual. The Electrical System Schematic and the Operation and Maintenance Manual are required support material.As a guide, a Typical EMS Schematic is at the end of this manual. For an accurate representation of the machine being diagnosed, 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 to trace the circuit. Perform continuity checks at connectors to locate harness failures. At component connectors, always check the ground circuit. Less than approximately 5 ohms of resistance is required between the connector ground contacts and frame ground. Excessive ground resistance, greater than approximately 5 ohms, can cause incorrect diagnosing of problems.During troubleshooting, inspect all component and harness connections before any component is replaced. If these connections are not clean and tight, electrical problems can occur, either permanent or intermittent. Make sure that the connections are tight before other tests are made.Failure of an electrical component can cause (or be caused) by the failure of one or more other components. Always attempt to find and correct the CAUSE of an electrical system failure before replacing of a component.