TM-9-2320-361-24-1 Field Maintenance Manual Volume 1 for M44A2 Series Trucks
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TM 9-2320-361-24-1 0014 00 0014 00-16 INDICATORS, GAUGES, AND WARNING SYSTEM TROUBLESHOOTING (Contd) Table 1. Indicator, Gauges, and Warning System Troubleshooting (Contd). MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION 9. LOW AIR PRESSURE WARNING SYSTEM INOPERATIVE Test 1. Test input voltage to buzzer. 1. Turn power accessory switch to OFF position. 2. Disconnect lead 85 from buzzer. 3. Drain air pressure from air tanks to less than 54 psi (TM 9-2320-361-10). Close drain valve. 4. Set multimeter to a voltage range that will measure 24 VDC. 5. Turn power accessory switch to ON position. 6. Connect negative lead to frame ground. 7. Touch positive lead to contact ends of lead 85. Test 2. Test continuity of low air pressure switch. 1. Turn power accessory switch to OFF position. 2. Disconnect lead 85 from pin B of low air pressure switch. 3. Turn power accessory switch to ON position. 4. Connect negative lead of multimeter to frame ground. Connect positive lead of multimeter to pin B of low air pressure switch. Battery voltage should be present. Test 3. Test voltage into low air switch. 1. Disconnect lead 85 at pin A of low air switch. 2. Set multimeter to a voltage range that will measure 24 VDC. 3. Connect negative lead to frame ground and touch positive lead to contact end lead 85. 1. If voltage is present, replace low air pressure buzzer (WP 0110 00). 2. If voltage is not present, go to test 2. 1. If voltage is not present, go to test 3. 2. If voltage is present, check continuity of lead 85 connected between pin B of low air switch and buzzer. 1. If voltage is not present, repair or replace lead 85. 2. If voltage is present, replace low air buzzer (WP 0110 00).