KNOWN INFO POSSIBLE PROBLEMS TEST OPTIONS REASON FOR QUESTION KNOWN INFO POSSIBLE PROBLEMS TEST OPTIONS REASON FOR QUESTION KNOWN INFO POSSIBLE PROBLEMS TEST OPTIONS REASON FOR QUESTION NO YES NO YES NO YES 2-146      Change 1 BATTERY CIRCUIT OK STARTER CIRCUIT OK ENGINE NOT SEIZED AIR AND FUEL TO   CYLINDERS INTAKE/EXHAUST FUEL SYSTEM ENGINE DOES THE ENGINE SOUND NORMAL AND HAVE NORMAL VIBRATIONS AT ALL SPEEDS ? REV THE ENGINE.  DRIVE THE VEHICLE. The first indication of a mechanical problem is an abnormal noise or vibration.  Before running other tests to check for engine problems, this is to try to make sure that you don't make a bad problem worse. GO TO B, Page  2-150 5 FUEL SYSTEM OK INTAKE/EXHAUST OK ENGINE STE/ICE-R TEST 14 (Page 2-737). If the engine fails the cylinder unbalance test then it indicates an individual cylinder problem such as a bad fuel injector, excessive blowby, etc. DOES THE ENGINE PASS THE COMPRESSION UNBALANCE TEST? FROM 3, Page  2-144 BATTERY CIRCUIT  OK STARTER CIRCUIT  OK ENGINE NOT SEIZED AIR AND FUEL TO   CYLINDERS 6 NO FAULTS FOUND. IF YOU WERE SENT HERE FROM ANOTHER TEST, RETURN TO IT. 4 DIAGNOSTIC FLOWCHART COMPRESSION / MECHANICAL GO TO C, PAGE 2-152 DOES THE ENGINE PASS THE POWER TEST? BATTERY CIRCUIT  OK STARTER CIRCUIT  OK ENGINE NOT SEIZED AIR AND FUEL TO   CYLINDERS ENGINE FUEL SYSTEM INTAKE/EXHAUST STE/ICE-R TEST 13 (Page 2-736). Loss of power can be caused by internal engine problems, fuel system, air intake/exhaust, or drivetrain problems. RUN THE TRANSMISSION AND STEERING TESTS.  IF NO FAULTS FOUND, NOTIFY DS TM 9-2320-280-20-1