TM-9-2320-361-20
2-1/2-TON, 6x6, M44A2 SERIES TRUCKS (MULTIFUEL)
TECHNICAL MANUAL; UNIT MAINTENANCE
OCTOBER 1991
TM-9-2320-361-20 - Page 217 of 1207
TM 9-2320-361-20
Table 2-4. Electrical Troubleshooting (Contd).
MALFUNCTION
TEST OR INSPECTION
CORRECTlVE ACTION
36. LOW AIR PRESSURE WARNING SYSTEM INOPERATIVE
Test 1. Test input voltage to buzzer.
Step 1.
Step 2.
Step 3.
Step 4.
Step 5.
Step 6.
Step 7.
Turn accessory/ignition switch to OFF position.
Disconnect lead 85 from buzzer.
Drain air pressure from air tanks to less than 54 psi (TM 9-2320-361-10). Close petcock.
Set multimeter to a voltage range that will measure 24 Vdc.
Turn accessory/ignition switch to ON position.
Connect negative lead to frame ground.
Touch positive lead to contact end of lead 85.
a. If voltage is present, replace low air pressure buzzer (para. 4-27).
b. If voltage is not present, go to test 2.
Test 2. Test continuity of low air pressure switch.
Step 1. Turn accessory/ignition switch to OFF position.
Step 2. Disconnect lead 85 from pin B of low air pressure switch.
Step 3. Turn accessory/ignition switch to ON position.
Step 4. Connect negative lead of multimeter to frame ground. Connect positive lead of multimeter
to pin B of low air switch. Battery voltage should be present.
a. If voltage is not present, go to test 3.
b. If voltage is present, check continuity of lead 85 connected between pin B of low air
switch and buzzer.
Test 3. Test voltage into low air switch.
Step 1. Disconnect lead 85 at pin A of low air switch.
Step 2. Set multimeter to a voltage range that will measure 24 Vdc.
Step 3. Connect negative lead to frame ground and touch positive lead to contact end lead 85.
a. If voltage is not present, repair or replace lead 85.
b. If voltage is present, replace low air buzzer (para. 4-27).
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