Ford Thunderbird/Cougar, Ranger, Explorer IAT & ECT Sensor Connector Pinout

This document is a Ford EEC wiring/pinout diagram covering the Intake Air Temperature (IAT) sensor and Engine Coolant Temperature (ECT) sensor vehicle harness connectors. It applies to the Thunderbird/Cougar, Ranger, Explorer, and 7.5L E/F Series (E-Series/F-Series) vehicles. The diagram shows both two-pin sensor harness connectors drawn as viewed into the mating surface, with their circuit connections traced to breakout box test pins used in EEC diagnostic testing: Test Pin 91 corresponds to SIG RTN (signal return), which is shared between both sensors; Test Pin 39 corresponds to the IAT signal circuit; and Test Pin 38 corresponds to the ECT signal circuit. Footnotes clarify that the test pins are located on the breakout box and that all harness connectors are illustrated as viewed into the mating surface. The figure carries the Ford illustration reference number AA0454-A. A technician can use this diagram to identify which terminal of each sensor connector carries the signal versus signal return, and to know which breakout box pins to probe when diagnosing IAT or ECT sensor circuits on the listed vehicles. No wire colors, resistance specifications, or year information are printed on the diagram itself.