What wire color is the TP sensor signal circuit?

Circuit 355 GY/W (gray/white) carries the TP sensor signal to PCM pin 47; the sensor also shares reference circuit 359 GY/R and return circuit 359/351 wiring shown on the diagram.

How does the ECT sensor work according to this diagram?

It is a thermistor whose resistance decreases as engine coolant temperature increases. The PCM detects the voltage drop and uses the information to help calculate fuel delivery, spark timing, idle speed and EGR control.

What PCM pins are used for these sensor circuits?

Top-row PCM pins shown are 2, 33, 23, 7, 25, 47 and 27; bottom-row pins 4, 16, 36 and 56 connect via wires 382 Y/BK, 259 O/R, 929 PK and 395 GY/O to the ignition system (page 21-1).

What does the PCM do per this diagram?

It is a solid-state module that receives inputs from various sensors and uses the information to control fuel flow, Exhaust Gas Recirculation (EGR), ignition, transmission controls and evaporative emissions.

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Ford Bronco 5.8L Engine Controls Wiring Diagram - PCM, TP, ECT, IAT, EGR Sensors

Wiring diagram 25-3 Engine Controls 5.8L showing EGR solenoid, ECT, IAT, TP and EVP sensors with color-coded wires to the PCM

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Engine controls wiring diagram for the 5.8L, showing EGR control solenoid and ECT, IAT, TP and EVP sensor circuits to the PCM.

AI caption April 2011 · Photo 957 of 2216

This document is page 25-3 of a Ford engine controls wiring diagram covering the 5.8L engine. It shows the Powertrain Control Module (PCM) sensor input circuits, including the EGR Control Solenoid (connector C180), Engine Coolant Temperature (ECT) sensor (C183), Intake Air Temperature (IAT) sensor (C164), Throttle Position (TP) sensor (C1024M/C1024F), and EGR Valve Position (EVP) sensor (C182). Explanatory callouts describe how each sensor works: the ECT and IAT are thermistors whose resistance drops with temperature; the TP sensor is a potentiometer varying with throttle plate angle; the EVP sensor indicates EGR valve position; and the PCM uses these inputs to control fuel flow, EGR, ignition, transmission controls and evaporative emissions. Circuit numbers and wire colors are labeled, including 361 R, 359 GY/R, 360 BR/PK, 354 LG/R, 743 GY, 355 GY/W, 351 BR/W, 352 BR/LG, 511 LG, 310 Y/R, 382 Y/BK, 259 O/R, 929 PK, and 395 GY/O. PCM connector C185 pin numbers 2, 33, 23, 7, 25, 47, 27, 4, 16, 36, and 56 are shown. Cross-references point to power feed S149 on page 25-2, Turn/Stop/Hazard Lamps on page 90-2, and the Ignition System on page 21-1, with a brake-pedal input noted for E4OD-equipped trucks.

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Frequently asked questions

What sensors are shown on this 5.8L engine controls wiring diagram?: The EGR Control Solenoid (C180), Engine Coolant Temperature (ECT) sensor (C183), Intake Air Temperature (IAT) sensor (C164), Throttle Position (TP) sensor (C1024M/C1024F), and EGR Valve Position (EVP) sensor (C182), all wired to the Powertrain Control Module (PCM) at connector C185.
What wire color is the TP sensor signal circuit?: Circuit 355 GY/W (gray/white) carries the TP sensor signal to PCM pin 47; the sensor also shares reference circuit 359 GY/R and return circuit 359/351 wiring shown on the diagram.
How does the ECT sensor work according to this diagram?: It is a thermistor whose resistance decreases as engine coolant temperature increases. The PCM detects the voltage drop and uses the information to help calculate fuel delivery, spark timing, idle speed and EGR control.
What PCM pins are used for these sensor circuits?: Top-row PCM pins shown are 2, 33, 23, 7, 25, 47 and 27; bottom-row pins 4, 16, 36 and 56 connect via wires 382 Y/BK, 259 O/R, 929 PK and 395 GY/O to the ignition system (page 21-1).
What does the PCM do per this diagram?: It is a solid-state module that receives inputs from various sensors and uses the information to control fuel flow, Exhaust Gas Recirculation (EGR), ignition, transmission controls and evaporative emissions.