TM 1-1520-238-T-4 Change 5 6–82.17 6–21. HOD XMN 2 READING – DOES NOT DISPLAY AMBIENT TEMPERATURE 6–21 Tools: Nomenclature Part Number Tool Kit, Electrical SC518099CLA06 Repairer’s Multimeter, Digital AN/PSM-45 Personnel Required: 68X Armament/Electrical Systems Repairer One person to assist References: TM 1-1520-238-23 TM 1-1520-238-T-6 TM 55-1500-323-24 TM 9-1230-476-20-2 Equipment Conditions: Ref Condition TM 1-1520-238-23 Access provisions – L200 and R200 access panels and aft avionics bay door open. 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. NOTE Transmission will display higher than ambient temperature if recently operated. Entry in ( ) following pin locations is multimeter lead orientation. 1. Detach P755. Check for open between: P755–3 and P755–5 (red/blk), P755–7 and P755–8 (red/blk). Does open exist? YES Go to step 3. NO Go to step 2. 2. Check for short between: P755–3 and ground, P755–5 and ground, P755–7 and ground, P755–8 and ground. Does short exist? YES Go to step 3. NO Go to step 4. 3. Locate open or short in wire harness between P755 and MT14. Can wire harness be repaired? YES Repair wiring (TM 55-1500-323-24). Go to paragraph 6–13. NO Replace MT14 (TM 1-1520-238-23). Go to paragraph 6–13. 4. Detach P682. Check for short between: P682–84 and ground, P682–85 and ground. Does short exist? YES Repair shorted wire between: P682–84 and ground, P682–85 and ground (TM 55-1500-323-24). Go to paragraph 6–13. NO Go to step 5. 5. Reconnect P755. Check for open between: P682–84 and P682–85 (blk/red). Does open exist? YES Repair open wire (TM 55-1500-323-24). Go to paragraph 6–13. NO Refer to TM 9-1230-476-20-2 to troubleshoot multiplex subsystem. END OF TASK