TM 9-2350-287-20-12-19. TROUBLESHOOTING CHART (continued).v. AFES, ENGINE (continued).(2) FIRE WIRE (F/W) LED REMAINS ON, NO FIREPRESENTInitial Setup:Tools/Test Equipment:Forward battery box openDigital multimeter (Item 13, Appendix I)(refer to TM 9-2350-287-10).General mechanic's tool kit (Item 24,Air intake grille opened and secureAppendix I)(refer to TM 9-2350-287-10).Engine AFES test and alarm panel MAINT switchMaterials/Parts:in maintenance position (para 21-2).Cleaning compound (Item 14, Appendix D)Equipment Conditions:Transmission doors open(refer to TM 9-2350-287-10).A.CAUTIONDigital multimeter (DMM) must not beoperated any longer than necessary toobtain a reading. Misleading improvementsin resistance readings could result.NOTE·Use a DMM for the following tests. Do notuse a standard volt/ohm meter (VOM).The VOM's method of operation will notgive accurate readings.·Sixty-inch elements are installed at theunderside of engine deck, above engine.1. Disconnect all fire sensing element couplings (para 21-10).2. Check all connections for dirt and grease. Clean withcleaning compound.3. Using a multimeter, measure resistance between centerand outer sheath of each of five sensing elements and sixcouplings separately.4. Resistance of each item must be greater than 1 megohm.Are any components defective?Continued on next pageChange 1 2-328
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