UNION 2H3940 - Caterpillar

Cat® Electronic Technician (ET) includes the following tests that aid in troubleshooting the injector solenoids. For more information, refer to the engine Troubleshooting manual."Cylinder Cutout Test"All active diagnostic codes must be corrected before running the "Cylinder Cutout Test". Use the test to diagnose a malfunctioning injector while the engine is running. When a good injector is cut out, the "Delivered Fuel Volume" of the remaining injectors should change. The change in "Delivered Fuel Volume" is due to the extra load on each of the remaining cylinders. If a malfunctioning injector is cut out, the "Delivered Fuel Volume" will not change for the remaining injectors. The "Cylinder Cutout Test" is used to isolate the malfunctioning injector in order to avoid replacement of good injectors."Injector Solenoid Test"Use the "Injector Solenoid Test" to aid in diagnosing an open circuit or a short circuit while the engine is not running. The test briefly activates each solenoid. A good solenoid will create an audible click when the solenoid is activated. Cat ET will indicate the status of the solenoid as "OK", "Open", or "Short".