TM-9-2320-280-20 HMMWV Technical Manual Unit Maintenance Volume 1 Download
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TM 9-2320-280-20-1 Description: STARTER CIRCUIT RESISTANCE TEST #74 This procedure measures starter circuit resistance. Test requires DCA hookup only. Typical Applications: Check resistance of complete starting system in Cl engines with VTM powered from batteries of Vehicle being tested. Test Procedure: 1. Disconnect fuel Solenoid wire 54A to prevent starting. 2. Make sure all vehicle accessories are off. 3. Set TEST SELECT switches to 74. 4. Press and hold TEST button until CAL appears on display. 5. Release TEST button and waft for offset value to appear on display. lf offset is within the range -150 to 150, proceed. If not, go to DCA Troubleshooting Procedure. 6. Press and release TEST button. 7. When GO appears on display, crank engine for 2 seconds or until one of the following appears on the display OFF .9.9.9.9 A number An error message 8. Observe displayed value(milliohms). Pre-Test Procedures: Run Confidence Test Warm up engine to operating temperature. Turn off all electrical accessories. Possible Error Messages E002 Transducer not connected. E005 Offset not performed. E003 VTM does not detect battery voltage. E013 VTM cannot use data received. E020 No first peak information was detected by the VTM. E021 VTM cannot calculate result because current is over current probe’s range. NOTES If .9.9.9.9 is displayed, the starter circuit resistance value was too high and cannot be measured with VTM. If E013 is displayed, then check battery connections and correct as necessary. Repeat Step 6. If E013 persistes after 3 tests, VTM cannot perform test. 2-747