TM 9-2320-280-20-1 KNOWN INFO POSSIBLE PROBLEMS DIAGNOSTIC FLOWCHART TEST OPTIONS REASON FOR QUESTION NO YES 2-176          Change 1 ENGINE COOLING FROM C3, Page 2-174 C3.1 ENGINE COOLANT     TEMPERATURE   BELOW  NORMAL   (215°F)  (102°C) TIME DELAY MODULE TURN THE ROTARY SWITCH TO "RUN" POSITION. MEASURE THE VOLTAGE AT WIRE 583 ON THE 2-WAY HARNESS OF THE TIME DELAY MODULE (DO NOT DISCONNECT HARNESS). IS THERE BATTERY VOLTAGE? REPLACE TIME DELAY MODULE MULTIMETER WIRE 583 SHOULD INDICATE BATTERY VOLTAGE. KNOWN INFO POSSIBLE PROBLEMS NO YES C4 FAN DRIVE OK FAN WON'T DISENGAGE TIME DELAY MODULE WIRING CONTROL VALVE HYDRAULIC SYSTEM DISCONNECT THE 2-WIRE COUPLING AT THE TIMER. MEASURE THE RESISTANCE THROUGH THE CONTROL VALVE ELECTRICAL CONNECTOR. IS IT ABOUT 65 OHMS? REPLACE CONTROL VALVE MULTIMETER – WITH AN ANALOG MULTIMETER, YOU MAY GET 65 TO 100 OHMS ONE WAY AND UNDER 30 OHMS THE OTHER WAY. THIS IS OK. The need to check out the windings in the control valve to see if they're OK. GO TO C5, Page 2-178 KNOWN INFO POSSIBLE PROBLEMS NO YES C3.2 ENGINE COOLANT   TEMPERATURE   BELOW NORMAL   (215°F) (102°C) TIME DELAY MODULE MEASURE THE VOLTAGE AT WIRE 93 ON THE 2-WIRE HARNESS OF THE TIME DELAY MODULE (DO NOT DISCONNECT HARNESS). IS THERE BATTERY VOLTAGE? REPLACE TIME DELAY MODULE MULTIMETER WIRE 93 SHOULD INDICATE 0 VOLTAGE. REASON FOR QUESTION TEST OPTIONS TEST OPTIONS REASON FOR QUESTION