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 0015 00 0015 00-3 HEATING SYSTEMS TROUBLESHOOTING (Contd) MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION 1. ENGINE MANIFOLD HEATER DOES NOT WORK (Contd) Test 4. Test manifold heater spark plug. 1. Remove manifold heater spark plug (WP 0065 00 or WP 0066 00). 2. Connect jumper wire from spark plug to engine ground. 3. Disconnect wiring harness from manifold heater fuel pump. 4. Turn power accessory switch to ON position. 5. Position manifold heater switch to START. Test 5. Test manifold spark plug cable. 1. Remove cable from manifold heater spark plug (WP 0065 00 or WP 0066 00). 2. Remove spark plug cable at ignition coil. 3. Set multimeter to RX 1000 scale. 4. Touch multimeter negative lead to contact end of spark plug cable at the plug. 1. If spark plug does arc, go to test 9. 2. If spark plug does not arc, replace spark plug. (WP 0065 00 or WP 0066 00) and repeat test 4. 3. If retest of test 4 fails to produce an arc to engine, go to test 5. Table 1. Heating Systems Troubleshooting Procedures (Contd). MANIFOLD HEATER SPARK PLUG CABLE MANIFOLD HEATER SPARK PLUG TEST 5 STEPS 4 AND 5 FUEL PUMP IGNITION COIL