TM 1-1520-238-T-5 8–160 8–88. PILOT TGT INDICATOR – DOES NOT INDICATE ENGINE 1 TGT 8–88 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 590 to 720 ohms resistance between P23–1 and P23–2. Is resistance present? YES Go to step 2. NO Go to step 4. 2. Check for open between: J23–2 and P400–44, J23–1 and P400–45, P68–22 and P400–37, P68–23 and P400–38. Does open exist? YES Repair open wire. Go to paragraph 8–10. NO Go to step 3. 3. Detach P68 and P400. Check for short between: J23–1 and J23–2, J23–3 and J23–1, J23–3 and J23–2, P68–22 and P68–23, P68–21 and P68–22, P68–21 and P68–23. Does short exist? YES Repair shorted wire between: J23–2 and P400–44, J23–1 and P400–45, P68–22 and P400–37, P68–23 and P400–38. Go to paragraph 8–10. NO Replace pilot TGT indicator (TM 1-1520-238-23). 4. Check for open between: P23–1 and P41–16, P23–2 and P41–17. 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 P41. Check for short between: P23–1 and P23–2, P23–3 and P23–1, P23–3 and P23–2. 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