Troubleshooting General Troubleshooting Information Troubleshooting engine problems can be difficult. An engine wiring diagram is provided in this section to help isolate electrical problems on power units using John Deere wiring harness and instrument (gauge) panel. Know the engine and all related systems. Study the problem thoroughly. Relate the symptoms to your knowledge of engine and systems. Diagnose the problem starting with the easiest things first. Double-check before beginning the disassembly. Determine cause and make a thorough repair. After making repairs, operate the engine under normal conditions to verify that the problem and cause was corrected.
Wiring diagrams are shown for the electronic instrument panel and harness offered for these engines. Later in this section is a list of possible engine problems that may be encountered accompanied by possible causes and corrections. The illustrated diagrams and troubleshooting information are of a general nature; final design of the overall system for your engine application may be different. See your engine distributor or servicing dealer if you are in doubt. NOTE: The engines covered in this manual have electronic control systems which send diagnostic trouble codes to signal problems (see DIAGNOSTIC TROUBLE CODE PROCEDURE, later in this section).
A reliable program for troubleshooting engine problems should include the following basic diagnostic thought process: RG,RG34710,5605 –19–12NOV01–1/1 45-1 021604 PN=195