TM-9-2320-387-24 HMMWV Direct Support & General Support Maintenance Manual Volume 1 Download
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TM 9-2320-387-24-l 1 2-46. STE/ICE-R TEST PROCEDURES (Cont’d) STARTER CIRCUIT RESISTANCE TEST #74 Description: Pm-Test Procedures: This procedure measures starter circuit resistance. Test requires DCA hookup only. Run confidence test. Warm up engine to operating temperature. Turn off all electrical accessories. Typical Applications: Possible Error Messages: Check resistance of complete starting system in Cl engines with VTM powered from batteries of vehicle being tested. E002 Transducer not connected. E005 Offset not performed. E008 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. Test Procedure: 1. 2. 3. 4. 5. 6. 7. Disconnect fuel solenoid wire 54A to prevent starting. Make sure all vehicle accessories are off. Set TEST SELECT switches to 74. Press and hold TEST button until CAL appears on display. Release TEST button and wait for offset value to appear on display. If offset is within the range -150 to 150, proceed. If not, go to DCA Troubleshooting Procedure. Press and release TEST button. 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). NOTES: If .9.9.9.9 is displayed, the starter circuit resistance value was too high and cannot be measured with VTM. If EO13 is displayed, check battery connections and correct as necessary. Repeat Step 6. If E013 persists after 3 tests, VTM cannot perform test. 2-503