TM-9-2320-387-24 HMMWV Direct Support & General Support Maintenance Manual Volume 1 Download
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TM 9-2320-387-24-l INSTRUMENTS CIRCUIT DIAGNOSTIC FLOWCHART 1 TES T OPTIONS NONE BLEED BRAKE SYSTEM. DOES THE LIGHT STAY ON? POSSIBLE PROBLEMS) REASON FOR QUESTION If the lamp stays on, it could be that the hydraulic brake system has a fault and might require bleeding. PROPORTIONING VALVE WIRING PARKING BRAKE SWITCH BOX BRAKE WARNING PRESSURE SWITCH TEST OPTIONS BRAKE WARNING LIGHT WON’T GO OFF - I ZHECK PROPORTIONING VALVE ‘OR PROPER OPERATION. (GO l-0 B-7 PAGE 2-428). IS PROPOR- rlONlNG VALVE OPERATING ‘ROPERLY? NONE REASON FOR QUESTION If the lamp stays on after bleeding the brake system, the proportioning valve could be malfunctioning. 1 POSSIBLE PROBLEMS PROPORTIONING VALVE WIRING PARKING BRAKE SWITCH BOX BRAKE WARNING PRESSURE SWITCH r . 3RAKE WARNING LIGHT WON’T GO OFF 3 1 1 TEST OPTIONS VISUAL IISCONNECT WIRE 67A AND 67B FROM BRAKE WARNING PRESSURE SWITCH, AND WIRE 67C FROM PARKING BRAKE SWITCH. DISCON- NECT THE PCB BODY HARNESS CONNECTOR. CONNECT A JUMPER WIRE BETWEEN WIRES 67A AND 67B. DOES THE LIGHT GO OUT? REASON FOR QUESTION If the lamp stays on with the PCB, valve switch, and park brake switch disconnected, the problem is in the wiring. I POSSIBLE PROBLEMS 1 WIRING PARKING BRAKE SWITCH BOX BRAKE WARNING PRESSURE SWITCH 2-328