TM-9-2320-280-20 HMMWV Technical Manual Unit Maintenance Volume 1 Download
Page 254 of 890
KNOWN INFO POSSIBLE PROBLEMS DIAGNOSTIC FLOWCHART TEST OPTIONS REASON FOR QUESTION KNOWN INFO POSSIBLE PROBLEMS NO YES 2-170 Change 1 ENGINE COOLING DISCONNECT THE CONTROL VALVE ELECTRICAL CONNECTOR AT THE TIME DELAY MODULE. DOES THE FAN ENGAGE? B FROM A4, Page 2-166 REPLACE CONTROL VALVE B1 B2 FAN DRIVE OK FAN DOESN'T ENGAGE VIA WIRE 458 FAN WIRING TIME DELAY MODULE FAN CONTROL VALVE PCB/DISTRIBUTION BOX TRY IT. With no power to the solenoid, the fan should engage. FAN ENGAGES CONTROL VALVE OK WIRING TEST OPTIONS REASON FOR QUESTION NO YES KNOWN INFO POSSIBLE PROBLEMS B3 FAN ENGAGES CONTROL VALVE OK WIRING TEST OPTIONS REASON FOR QUESTION NO YES DISCONNECT THE 4-WIRE CONNECTOR AT THE TIME DELAY MODULE. IS THERE CONTINUITY FROM 458B AT THE 4-WIRE HARNESS TO 458B AT THE FAN TEMPERATURE SWITCH? REPAIR/REPLACE WIRE 458B 1. STE/ICE-R TEST 91 (Page 2-752) 2. MULTIMETER Wire 458B connects the switch and the timer. GO TO B4, Page 2-172 WITH THE ROTARY SWITCH ON "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 delay module. TM 9-2320-280-20-1