What fuse powers the heated oxygen sensor on the 5.0L?

A 15A fuse in position E of the Engine Compartment Fuse Box (HOT IN RUN), feeding circuit 298 P/O; see Power Distribution page 13-4.

What wire colors connect the MAP sensor to the PCM?

Circuit 359 GY/R (reference), 358 LG/BK (signal), and 351 BR/W (return) at connector C1011.

What circuit carries the HO2S signal to the PCM?

Circuit 74 GY/LB, running from the heated oxygen sensor through connectors C1025 and C1003 to PCM pins *29/44**.

Where does the oxygen sensor ground?

Through circuit 57 BK, via splice S100 to ground G101; see Grounds page 10-3.

What does the MAP sensor do according to this diagram?

It measures atmospheric pressure for the PCM, which uses the information to adjust fuel/air ratio, line pressure, and shift scheduling for higher altitude operation.

Home/ Registry/ Ford/ Bronco/ 1992-1996/ “Buckin Bronco”/ Photo supermotors.net/registry/media/1137655

Ford Bronco 5.0L Engine Controls Wiring Diagram - MAP & O2 Sensor to PCM (24-6)

Engine Controls wiring diagram, 5.0L, page 24-6, MAP sensor, heated oxygen sensor and turn signal circuits

‹ ›

Ford 5.0L engine controls wiring diagram of MAP sensor, heated oxygen sensor and turn/stop/hazard lamp circuits to the PCM.

AI caption August 2018 · Photo 370 of 386

This document is one page (24-6) of a Ford wiring diagram set covering Engine Controls for the 5.0L engine. It shows the wiring for the Manifold Absolute Pressure (MAP) sensor and the Heated Oxygen Sensor (HO2S) as they connect to the Powertrain Control Module (PCM). The MAP sensor (connector C1011) uses circuits 359 GY/R (reference), 358 LG/BK (signal), and 351 BR/W (return), with circuit 359 also feeding the VIP Data Link Connector (C198) through splice S137. The HO2S receives keyed power (12V in RUN) on circuit 298 P/O from a 15A fuse (position E) in the Engine Compartment Fuse Box (see Power Distribution, page 13-4), sends its signal to the PCM on circuit 74 GY/LB, and grounds through circuit 57 BK via S100 to ground G101 (see Grounds, page 10-3). A brake input on circuit 511 LG (12V with brake pedal depressed) comes from the Turn/Stop/Hazard Lamps circuit (page 90-2). Notes distinguish wiring with and without E4OD or 4R70W transmissions, with cross-references to E4OD Transmission (page 30-1) and 4R70W Transmission (page 29-3). Explanatory callouts describe the MAP sensor's role in adjusting fuel/air ratio, line pressure, and shift scheduling, and the HO2S's role in air/fuel regulation.

Is this accurate? Sign in to help verify it.

Frequently asked questions

What fuse powers the heated oxygen sensor on the 5.0L?: A 15A fuse in position E of the Engine Compartment Fuse Box (HOT IN RUN), feeding circuit 298 P/O; see Power Distribution page 13-4.
What wire colors connect the MAP sensor to the PCM?: Circuit 359 GY/R (reference), 358 LG/BK (signal), and 351 BR/W (return) at connector C1011.
What circuit carries the HO2S signal to the PCM?: Circuit 74 GY/LB, running from the heated oxygen sensor through connectors C1025 and C1003 to PCM pins *29/44**.
Where does the oxygen sensor ground?: Through circuit 57 BK, via splice S100 to ground G101; see Grounds page 10-3.
What does the MAP sensor do according to this diagram?: It measures atmospheric pressure for the PCM, which uses the information to adjust fuel/air ratio, line pressure, and shift scheduling for higher altitude operation.