LINK AS-TRACK 1156301 - Caterpillar

Troubleshooting
Introduction
On the pages that follow are two lists of possible problems; Diagnosed Problems List and Undiagnosed Problems List. Before checking the list of problems, check the ECM display for any diagnostic codes. These codes aid in finding the problem (see Diagnosed Problems List).
Before checking the list of problems, check the battery voltage of all electronic controls. At the power terminal connections, the required voltage measured between battery positive (B+) and battery negative (B-) is from +15 to +45 DCV. It is possible for battery voltages below +15 DCV to cause temporary failures of the electronic controls. It is possible for battery voltages above +45 DCV to cause permanent damage of the electronic controls and require correcting before troubleshooting any further. To locate the power terminal connections, refer to the following chart and the Schematics And Wiring Diagrams section.
Before replacing anything, inspect all control, component and harness connections. Loose connections could cause electrical problems. Make sure the connections are tight before testing continues.More than one faulty component or control could cause electrical failures. Find and correct the cause of an electrical failure before making any replacements.Identify the particular type of problem from the Problem List, then go directly to that problem. However, when beginning the procedure for that problem, start at Step 1 and follow through the step by step procedure. The Steps in a particular problem provide a definite sequence for a logical, one by one elimination of many variables. These steps are arranged in order from the more probable/easiest to check, to the less probable/more complex to check.When the cause of the problem is found and corrected, stop the test. Do NOT continue through the complete procedure.
When servicing or repairing electric power generation equipment, do the following:a. Make sure the unit is off-line (disconnected from utility power service and/or other generators), and either locked out or tagged DO NOT OPERATE.b. Make sure the generator engine is stopped.c. Make sure all batteries are disconnected.d. Make sure all capacitors are discharged.When power generation equipment is in operation to make tests and/or adjustments, high voltage and current are present. Make sure the testing equipment is designed for and correctly operated for the high voltage and current tests. Failure of improper test equipment presents a high voltage shock hazard to its user.
When the engine-generator, or any source to which the engine-generator is synchronized to, is operating, voltages up to 600V are present in the control panel.Do NOT short these terminals with line voltage to ground with any part of the body or any conductive material. Loss of life or injury could result from electrical shock or injury from molten metal.
Do NOT connect generator to a utility electrical distribution system, unless it is isolated from the system. Personal injury or death is possible by electrical feedback into the distribution system.Open and secure main distribution system switch or, if the connection is permanent, install a double throw transfer switch to prevent electrical feedback. Some generators are specifically approved by a utility to run