TM-9-2320-361-24-1 Field Maintenance Manual Volume 1 for M44A2 Series Trucks
Page 190 of 1176
MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION 1. STARTER WILL NOT CRANK NOTE • Ensure transmission is in neutral. • Check batteries and cables. (See WP 0012 00, table 1, malfunction 1, step 1.) Test 1. Test for battery voltage at pin 1 of starter solenoid with power accessory switch turned to ON position. 1. Turn start switch and listen for starter solenoid with power accessory switch turned to ON position. 2. Check lead 6 at starter solenoid for battery voltage. 3. Check lead 214 for battery voltage at pin 1 of starter solenoid. 4. Set multimeter to RX 1 scale. Check continuity between pin 4 of starter solenoid and frame ground. 5. Check battery cables for voltage drop (WP 0012 00, table 2, malfunction 2, tests 4 through 7). 1. If a thump sound is heard, go to step 2. 2. If thump sound is not heard, go to step 3. 3. Check for seized engine. Refer to WP 0006 00, table 1, malfunction 1, step 3. 1. If voltage is present but less than 19 VDC, check for corrosion and/or loose connections. 2. If no voltage is present and engine still fails to start, go to step 3. 1. If voltage is not present, go to test 2. 2. If voltage is present and solenoid does not engage starter motor, proceed to step 4. 1. If continuity is greater than 1 ohm, remove starter solenoid and starter motor ground cables (WP 0088 00). Repair or replace cables (WP 0126 00 and WP 0090 00) that have resistance greater than 1 ohm. Clean cable ends. Clean connections on starter motor and frame ground. Reconnect ground cables and ensure all connections are tight. Repeat test 1, step 1. 2. If continuity is greater than 1 ohm, starter solenoid is defective. Replace starter motor (WP 0088 00). If voltage is not present, clean and tighten cable connections (WP 0126 00). TM 9-2320-361-24-1 0012 00 0012 00-6 BATTERY AND CHARGING SYSTEM TROUBLESHOOTING (Contd) Table 2. Starting System Troubleshooting Procedure.