TM 1-1520-238-T-5 8–158 8–86. PILOT N_G RPM% INDICATOR – DOES NOT INDICATE ENGINE 2 N_G 8–86 Tools: Nomenclature Part Number Tool Kit, Electrical SC518099CLA06 Repairer’s Multimeter, Digital AN/PSM-45 Personnel Required: 68X Armament/Electrical Systems Repairer References: TM 1-1520-238-23 TM 55-2840-248-23 Equipment Conditions: Ref Condition TM 1-1520-238-23 Access provisions – RN1 door opened WARNING Turn off power before detaching or attaching wires and connectors. High current 28 VDC or 115 VAC is present. Failure to do so could result in death or serious injury. 1. Check for 3 0.5 ohms resistance between P24–22 and P24–23. Is resistance present? YES Go to step 2. NO Go to step 4. 2. Check for open between: J24–22 and P67–19, J24–23 and P67–20. Does open exist? YES Repair open wire. Go to paragraph 8–10. NO Go to step 3. 3. Detach P49 and P67. Check for short between: J24–22 and J24–23, J24–24 and J24–22, J24–24 and J24–23. Does short exist? YES Repair shorted wire between: J24–22 and P470–B5, P49–8 and P435–A14, P67–19 and P405–B16, P49–7 and P435–A13, P67–20 and P405–B17, J24–23 and P470–B6. (A326): J3–B16 and TB1–5–E, J3–B17 and TB1–5–K, J7–A13 and TB1–5–H, J7–A14 and TB1–5–J, J19–B5 and TB1–5–F, J19–B6 and TB1–5–L. Go to paragraph 8–10. NO Replace pilot N_G RPM% indicator. (TM 1-1520-238-23). 4. Check for open between: P24–22 and P46–20, P24–23 and P46–21. Does open exist? YES (ABY) Repair open wire. Go to paragraph 8–10. (ABZ) Replace wire harness (TM 1-1520-238-23). NO Go to step 5. 5. Detach P46. Check for short between: P24–22 and P24–23, P24–24 and P24–22, P24–24 and P24–23. Does short exist? YES (ABY) Repair open wire. Go to paragraph 8–10. (ABZ) Replace wire harness (TM 1-1520-238-23). NO Refer to TM 55-2840-248-23 to troubleshoot engine 2. END OF TASK