TM-9-2320-365-20-1 LMTV Unit Maintenance Manual M1078 Series - Volume 1 Download
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e14. TACHOMETER DOES NOT OPERATE OR IS INACCURATE NOTE If tachometer does not illuminate, perform Electrical System Troubleshooting e21. Tachometer Does Not Illuminate prior to beginning this task. 1. TEST OPTIONS REASON FOR QUESTION YES NO CAUTION Read CAUTION on following page. If resistance is greater than 1440 ohms, engine speed sensor is faulty. Resistance Test or STE/ICE-R Test #91 Is less than 1440 ohms resistance present from engine speed sensor connector socket 1 to pin 2? KNOWN INFO Faulty engine speed sensor. Faulty dashboard cable assembly. Faulty auxiliary panel cable assembly. Faulty engine control cable assembly. Faulty tachometer. POSSIBLE PROBLEMS Tachometer illuminates. VOLTS gage OK. START INITIAL SETUP Equipment Conditions Engine shut down (TM 9-2320-365-10). Tools and Special Tools Tool Kit, Genl Mech (Item 44, Appendix C) STE/ICE-R (Item 39, Appendix C) Multimeter, Digital (Item 22, Appendix C) Wrench, Torque, 0-75 lb-in. (Item 86, Appendix B) Materials/Parts Wire, Elect, 50 ft (Item 77, Appendix D) Personnel Required (2) References TM 9-4910-571-12&P Replace engine speed sensor (para 7-38). TM 9-2320-365-20-1 2-348 Change 1