KNOWN INFO POSSIBLE PROBLEMS DIAGNOSTIC FLOWCHART 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 2-174           Change 1 ENGINE COOLING C, FROM A5, Page 2-166 GO TO C3.1, Page 2-176 C1 C2 C3 DRIVE OK FAN ENGAGES BUT   WON'T DISENGAGE PCB/DISTRIBUTION BOX TIME DELAY MODULE WIRING HYDRAULIC SYSTEM REMOVE THE JUMPER BETWEEN WIRE 458A AND WIRE 458B. TURN THE ROTARY SWITCH TO THE "RUN" POSITION.  DOES WIRE 458A HAVE BATTERY VOLTAGE? IS THERE CONTINUITY FROM WIRE 458B AT THE HARNESS SIDE OF THE TIME DELAY MODULE 4-WAY CONNECTOR TO WIRE 458B AT THE FAN TEMPERATURE SWITCH? GO TO D, Page 2-182 REPAIR/REPLACE WIRES 458 & 458B 1. STE/ICE-R TEST 89 (Page 2-750) 2. MULTIMETER Wire 458A connects battery voltage to the switch. 1. STE/ICE-R TEST 91 (Page 2-752) 2. MULTIMETER Wire 458B connects the switch and the time delay module. DRIVE OK FAN ENGAGES BUT   WON'T DISENGAGE PCB/DISTRIBUTION BOX TIME DELAY MODULE WIRING HYDRAULIC SYSTEM TURN THE ROTARY SWITCH TO RUN. IS THERE BATTERY VOLTAGE AT THE HARNESS SIDE OF WIRE 583B IN THE 4-WAY CONNECTOR OF THE TIME DELAY MODULE? REPAIR/REPLACE WIRE 583B 1. STE/ICE-R TEST 89 (Page 2-750) 2. MULTIMETER Wire 583B connects battery voltage to the time delay module. DRIVE OK FAN ENGAGES BUT   WON'T DISENGAGE PCB/DISTRIBUTION BOX TIME DELAY MODULE WIRING HYDRAULIC SYSTEM TM 9-2320-280-20-1