Ford 4.9L Engine Controls Wiring Diagram 23-5 - ECT, IAT, Knock Sensor, PCM Pins

This is page 23-5 of a Ford factory-style wiring diagram titled "Engine Controls, 4.9L," covering sensor circuits connected to the Powertrain Control Module (PCM). It shows the Knock Sensor (KS) at connector C1009 with circuit 310 Y/R to PCM pin 23, the Engine Coolant Temperature (ECT) sensor at connector C183 with circuit 354 LG/R to PCM pin 7, and the Intake Air Temperature (IAT) sensor at connector C164 with circuit 743 GY to PCM pin 25. Sensor signal return circuit 359 GY/R runs through splice S138 and connector C125. Inputs also include the Turn/Stop/Hazard Lamps circuit 511 LG (12V with brake pedal depressed, page 90-2) to PCM pin 2, and Air Conditioner/Heater circuits 883 PK/LB (pin 10) and 348 P (12V switch closed, pin 43, via C185) from page 54-2. Outputs/interfaces at the bottom show the Vehicle Speed Sensor (VSS, pages 64-1/64-2) on circuits 676 PK/O (pin 6) and 679 GY/BK (pin 3), plus VIP Data Link Connectors on circuits 915 PK/LB (pin 9), 914 T/O (pin 28) via C198, and 209 W/P (pin 48) via C185/C199. Callout notes explain each sensor's function: knock detection, thermistor behavior for ECT/IAT, and the PCM's control of fuel, EGR, ignition, E4OD transmission, and evaporative emissions.