TM-9-2320-280-20 HMMWV Technical Manual Unit Maintenance Volume 1 Download
Page 198 of 890
REFERENCE INFORMATION The engine temperature must be below 90° F (32°C) to get voltage here. If the engine is warm, either wait for it to cool, or go to step C3 at the bottom of the pegs and remember that the cold advance maybe the problem if everything else checks out OK. The Glowplugs or the lntake/Exhaust System may be faulty, so you should test them first. The cold advance circuit advances the fuel injection pump timing approximately 3 to 5 degrees during cold start up. If engine temperature is less than 90°F (32°C), then Advance circuit operation maybe checked as follows: 1. 2. 3. 4. Start the engine. Disconnect wire 569B/569D from the Advance Solenoid. If the circuit is working correctly, then engine RPM should decrease. Look at the advance mechanism on the right side of the fuel injection pump while you connect and disconnect 569D/ 569B with the engine running. The advance mechanism should move about 1/4 inch. If the advance mechanism is stuck, apply some oil at the points shown and try again. Remember to reconnect any wires that were disconnected during troubleshooting. TM 9-2320-280-20-1 FUEL SYSTEM 0-45 DC VOLTS STE/ICE-R TEST 89 1. Connect RED clip to positive, BLACK clip to negative or ground. 2. Start Test 89, DC volts. 3. Displayed reading is in volts. BATTERY VOLTAGE MULTIMETER 1. Set the voltmeter to a DC volts scale of at least 40 volts. 2. Connect the RED lead to positive and the BLACK lead to negative. 3. Be sure to read the correct scale. 2-111