TM 9-2320-280-20-1 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 2-334          Change 1 NOTE: FOR DISTRIBUTION BOX SKIP STEPS C4, C5, AND C6. DISCONNECT GLOWPLUG CONTROLLER. DO YOU HAVE CONTINUITY BETWEEN SOCKET “6” IN THE CONTROLLER HARNESS & SOCKET A IN THE ENGINE CONNECTOR HARNESS? DO YOU HAVE CONTINUITY BETWEEN SOCKET “3” IN THE CONTROLLER HARNESS & SOCKET “B” IN THE ENGINE CONNECTOR HARNESS? RECONNECT GLOWPLUG CONTROLLER. DO YOU HAVE CONTINUITY BETWEEN SOCKET “A” & SOCKET “B” IN THE ENGINE CONNECTOR HARNESS? LAMP OK PCB/DISTRIBUTION BOX GLOWPLUG   CONTROLLER WIRING WIRING TO & FROM   CONTROLLER OK REPAIR 569A, 569C or REPLACE HARNESS REPAIR 459B or REPLACE HARNESS REPLACE GLOWPLUG CONTROLLER FROM C3, Page 2-332 C4 C5 C6 1. STE/ICE-R TEST 91          (Page 2-752) 2. MULTIMETER 1. STE/ICE-R TEST 91     (Page 2-752) 2. MULTIMETER 1. STE/ICE-R TEST 91     (Page 2-752) 2. MULTIMETER LAMP OK PCB/DISTRIBUTION BOX GLOWPLUG   CONTROLLER WIRING PCB/DISTRIBUTION BOX GLOWPLUG   CONTROLLER If you don’t have continuity here then you know that the controller is bad. This wire returns power for the lamp. This wire provides power to the controller. GO TO C7, Page 2-336 DIAGNOSTIC FLOWCHART INSTRUMENTS CIRCUIT