What fuse powers the PCM sensor circuit shown in this diagram?

Power comes from the PCM Power Relay (page 25-1) on circuit 361 R through fuse position 24, a 20A fuse in the Power Distribution Box (page 13-4).

What wire colors go to the heated oxygen sensors?

Each HO2S receives 34 LB/O and 94 R/BK (heater feed and ground side), with signal wires 387 R/W and 388 V/LB, plus 74 GY/LB and 89 O in the circuit.

Which connector is the Throttle Position sensor and what are its wires?

The TP sensor uses connector C157, with 355 GY/W (signal), 351 BR/W (reference), and 359 GY/R (return/ground).

What does the ECT sensor do according to this diagram?

The callout states the PCM measures the voltage drop across the negative temperature coefficient thermistor and uses this input to help calculate fuel delivery. The ECT sensor uses connector C159 with wires 354 LG/R and 359 GY/R.

Which PCM connector pins are shown for these sensors?

PCM connector C202 pins shown include 60, 87, 32 (387 R/W), 34 (354 LG/R), 46, 44, 26 (355 GY/W), 40 (351 BR/W), and 62; the EVP signal 18 O/Y also connects at C202.

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Ford F-250 PCM Wiring Diagram - HO2S, ECT, TP & EVP Sensor Circuits (E6)

Heated oxygen sensor, ECT, TP and EGR wiring diagram to PCM with color codes

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Wiring diagram of heated oxygen sensors 1 and 2, ECT, throttle position and EGR valve position sensor circuits to the PCM.

AI caption March 2015 · Photo 73 of 343

This document is one page (E6) of a multi-page Ford wiring diagram set covering the engine control/fuel system sensors. It shows the Powertrain Control Module (PCM, labeled 'SOLID STATE') and its wiring to Heated Oxygen Sensors #1 and #2, the Engine Coolant Temperature (ECT) sensor (connector C159), the Throttle Position (TP) sensor (connector C157), and the EGR Valve Position (EVP) sensor (connector C110). Power comes from the PCM Power Relay through circuit 361 (Red) and a 20A fuse (position 24) in the Power Distribution Box (page 13-4). Key circuits include 34 LB/O and 94 R/BK to the oxygen sensor heaters, 387 R/W and 388 V/LB oxygen sensor signal returns, 354 LG/R (ECT signal), 355 GY/W (TP signal), 18 O/Y (EVP signal), 351 BR/W (reference voltage, splice S148), and 359 GY/R (sensor ground to splice S166). Connectors C115, C116, C169, C182, and C202 (PCM connector with pin numbers 26, 32, 34, 40, 44, 46, 60, 62, 87) are identified, along with splices S119, S142, and S148. Explanatory callouts describe how the oxygen sensors, ECT thermistor, and TP sensor provide inputs the PCM uses to regulate air/fuel ratio and fuel delivery.

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Frequently asked questions

What fuse powers the PCM sensor circuit shown in this diagram?: Power comes from the PCM Power Relay (page 25-1) on circuit 361 R through fuse position 24, a 20A fuse in the Power Distribution Box (page 13-4).
What wire colors go to the heated oxygen sensors?: Each HO2S receives 34 LB/O and 94 R/BK (heater feed and ground side), with signal wires 387 R/W and 388 V/LB, plus 74 GY/LB and 89 O in the circuit.
Which connector is the Throttle Position sensor and what are its wires?: The TP sensor uses connector C157, with 355 GY/W (signal), 351 BR/W (reference), and 359 GY/R (return/ground).
What does the ECT sensor do according to this diagram?: The callout states the PCM measures the voltage drop across the negative temperature coefficient thermistor and uses this input to help calculate fuel delivery. The ECT sensor uses connector C159 with wires 354 LG/R and 359 GY/R.
Which PCM connector pins are shown for these sensors?: PCM connector C202 pins shown include 60, 87, 32 (387 R/W), 34 (354 LG/R), 46, 44, 26 (355 GY/W), 40 (351 BR/W), and 62; the EVP signal 18 O/Y also connects at C202.