ARMY TM  5-6115-612-34 MARINE  CORPS  TM  6115-34/8 AIR  FORCE TO  35C2-3-471-2 NAVY AG-320BO-MME-OOO Section II. TROUBLESHOOTING 2-3. GENERAL. This section contains troubleshooting information for locating  and  correcting  malfunctions that have been isolated to the engine electronic control module (EECM) and to the generator electronic control module (GECM). Table  2-4  lists  the  mal- functions by number and provides troubleshooting procedures. Each malfunction is followed by tests and inspections that  will  help  determine the  probable  cause  and  the  corrective action    to take. Perform the tests/inspections and corrective actions in the order listed. After repair, always repeat the test/inspection listed in table 2-4 to ensure that the malfunction has been corrected and   that   no   other   mal- functions  exist. This manual cannot list all malfunctions that may occur, nor all tests, inspections, and corrective actions. If a malfunction is not listed or cannot be corrected by listed corrective actions, notify supervisor. Refer  to  paragraphs  4-2 and 10-2 for additional GECM and EECM testing  and  maintenance  procedures. Table  2-4. Troubleshooting MALFUNCTION TEST  OR  INSPECTION CORRECTIVE  ACTION 1. DC CIRCUIT BREAKER TRIPPING - PROBLEM ISOLATED TO EECM. Step 1. Use an ohmmeter and measure resistance between P6-M and P6-N. Move MASTER SWITCH to RUN. If resistance is less than 100 ohms, go to Step 2. If resistance is greater than 100 ohms, replace power supply  circuit  card  (paragraph  10-2b). Step 2. Disconnect connector P1 from power supply circuit card. Again, use an ohmmeter and measure resistance between J6-M and J6-N. If resistance is greater than 100 ohms, replace power supply  circuit  card  (paragraph  10-2b). If resistance is less than 100 ohms, go to Step 3. Step 3. Disconnect connector P2 from switch circuit card. Again measure  resistance  between  J6-M  and  J6-N. If resistance is greater than 100 ohms, replace switch circuit  card  (paragraph  10-2b). If resistance is less than 100 ohms, go to Step 4. 2-40