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. STEKE-R TEST PROCEDURES (Cont’d) I _ BATTERY INTERNAL RESISTANCE TEST #73 Description: This procedure measures the internal battery resistance. Internal battery resistance is a measure of the state of the batteries. Test requires DCA hookup only. Typical Applications: Possible Error Messages: Evaluate batteries on Cl engines with VTM being powered from battery of vehicle tested. E002 Transducer not connected. E005 Cffset not performed. E006 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. Disconnect fuel solenoid wire 54A from the injector pump to prevent starting. 2. Make sure all vehicle accessories are off. 3. Set TEST SELECT switches to 73. 4. Press and hold TEST button until CAL appears on display. . 5. Release TEST button and wait for offset value to appear on display. If offset is within the -150 to 150 range, 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 .s.s.s.s A number An error message 8. Observe displayed value (milliohms). The limit is 25 milliohms per battery pair. 9. Test 75 is Battery Resistance Change. You can run that test after this one if desired. Pm-Test Procedures: Run confidence test. Turn off all electrical accessories. NOTES: If .S.S.S.S is displayed, battery internal resistance was too high and cannot be measured with VTM. If E013 is displayed, check battery connections and correct as necessary. Repeat Step 6. If E013 persists after 3 tests, VTM cannot perform test. 2-502