ALTERNATOR GP 20R2223 - Caterpillar

- This pertains to the status of a fault or to the status of a service code. When the fault is active, the fault is currently present.+Battery - This pertains to any of the harness wiring which is part of the circuit that connects to the positive battery post.+V - +V is a constant voltage that is supplied to a component. This voltage provides electrical power for the component's operation. +V is provided by an electronic control module or the battery.Caterpillar Electronic Technician (ET) - This is a diagnostic service tool for a personal computer (PC). Clear - This pertains to removing diagnostic information from the memory of the ECM. Before clearing a fault, a fault must be on hold and a fault must not be present.Component Identifier (CID) - A CID is a code that is used to identify a particular component. The CID is a four digit code that is shown on the ECM display when the ECM is in service mode or normal mode.Connector Contact - A connector contact is the component that actually makes the electrical connection between the harness connector and another connector plug. Connector contacts are either pins or sockets.Detected Fault - This is a fault that has been found by the ECM. The fault is recorded and diagnostic information is available in the service mode.Diagnostic - Diagnostic information is available when the ECM is in service mode. This helps a technician with troubleshooting.Electronic Control Analyzer Programmer (ECAP) - This is a service tool which helps diagnose electronic control systems.Fault - A fault is a failure of a component in an ECM system. The ECM detects a fault when a signal at the ECM connector is outside a valid range. An FMI and a CID identify the type of fault.Failure Mode Identifier (FMI) - An FMI is a diagnostic code that identifies the type of failure that has occurred. The FMI consists of a decimal point "." and two digits. This code is shown on the ECM display when you are in service mode or normal mode. Harness Code - The harness code provides the characteristics of the machine such as the size of the engine, idle speed, tire size and attachments. The Caterpillar Monitoring System uses the data link to provide the harness code to the ECM. The ECM operates on different machines, but the ECM must know the characteristics of the machine. Hold - This pertains to the holding of diagnostic information that is shown in the display area when the ECM is in the service mode. It is necessary to hold the set of diagnostic information before troubleshooting or clearing.Jumper - A jumper is a piece of wire that is used to make an electrical connection during troubleshooting.Machine Code - The machine code is a number that consists of two digits. The machine code is assigned to a particular harness code for a particular machine by the ECM. The machine code is shown on the message display when the