TM-9-2320-361-24-1 Field Maintenance Manual Volume 1 for M44A2 Series Trucks
Page 268 of 1176
TM 9-2320-361-24-1 0015 00 0015 00-12 HEATING SYSTEMS TROUBLESHOOTING (Contd) Table 1. Heating Systems Troubleshooting Procedures (Contd). MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION 3. PERSONNEL FUEL BURNING HEATER INOPERATIVE (Contd) Test 4. Check for input power at fuel pump. 1. Set multimeter to a range that will measure 24 VDC. 2. Disconnect lead 25 at fuel pump. 3. Touch multimeter positive lead to contact end of lead 25. 4. Touch multimeter negative lead to frame ground. Voltage should be present. Test 5. Check for power input at personnel heater. 1. Set multimeter to a voltage that will measure 24 VDC. 2. Disconnect harness connector at personnel heater. 3. Set heater control switch to the run position. 4. Touch multimeter positive lead to pin A of harness connector. 5. Touch multimeter negative lead to frame ground. 6. Repeat steps 4 and 5 for pins B, C, and D. Voltage should be present at all pins tested. 1. If voltage is present, check fuel pump for proper operation. Refer to WP 0006 00, table 21, malfunction 2, step 5. 2. If fuel pump is operating properly. Go to test 5. 3. If voltage is not present, repair or replace lead 25 (WP 0090 00). 1. If voltage is present, replace personnel heater (WP 0351 00). 2. If voltage is not present at one or more pins, repair or replace harness connector (WP 0090 00).