TM 1-1520-238-T-5 8–157 8–85. PILOT N_G RPM% INDICATOR – DOES NOT INDICATE ENGINE 1 N_G 8–85 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 – LN1 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 P23–22 and P23–23. Is resistance present? YES Go to step 2. NO Go to step 4. 2. Check for open between: J23–22 and P67–22, J23–23 and P67–23. 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: J23–22 and J23–23, J23–24 and J23–22, J23–24 and J23–23. Does short exist? YES Repair shorted wire between: J23–22 and P405–A11, P67–22 and P405–A14, P49–3 and P435–A12, J23–23 and P405–A10, P67–23 and P405–A13, P49–4 and P435–A11. (A326): J3–A11 and TB1–4–N, J3–A13 and TB1–4–W, J3–A14 and TB1–4–P, J7–A11 and TB1–4–Y. J7–A12 and TB1–4–R. Go to paragraph 8–10. NO Replace pilot N_G RPM% indicator (TM 1-1520-238-23). 4. Check for open between: P23–22 and P45–20, P23–23 and P45–21. 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 P45. Check for short between: P23–22 and P23–23, P23–24 and P23–22, P23–24 and P23–23. Does short exist? YES (ABY) Repair shorted 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 1. END OF TASK