What fuse powers the heated oxygen sensor (HO2S) on the 1995 Bronco 5.0L?

Fuse E, a 15A fuse in the engine compartment fuse box, Hot in Run, feeding circuit 298 (P/O wire) to the HO2S heater. See Power Distribution page 13-4.

What wire colors connect to the MAP sensor on the 1995 Bronco 5.0L?

The MAP sensor (connector C1011) uses circuit 359 GY/R (gray/red), circuit 358 LG/BK (light green/black), and circuit 351 BR/W (brown/white).

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.

Where does the oxygen sensor ground on the 1995 Bronco?

The HO2S grounds through circuit 57 (BK wire), through connectors C1003F/C1003M and splice S100 to ground G101 (see Grounds, page 10-2).

What is the oxygen sensor signal circuit to the PCM?

Circuit 89 (orange wire) carries the HO2S signal voltage to the PCM; routing differs with or without the E4OD or 4R70W transmission, and circuit 74 GY/LB is also shown to the PCM.

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1995 Ford Bronco 5.0L Engine Controls Wiring Diagram - MAP, HO2S, PCM (24-6)

1995 Bronco 5.0L engine controls wiring diagram with PCM, MAP and heated oxygen sensor

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Wiring diagram of the 5.0L engine controls showing the PCM, MAP sensor, heated oxygen sensor and color-coded circuits.

AI caption March 2015 · Photo 1727 of 1799

This is page 24-6 of the 1995 Ford Bronco factory wiring diagrams (EVTM), covering the Engine Controls circuit for the 5.0L engine. The diagram shows wiring between the Powertrain Control Module (PCM), the Manifold Absolute Pressure (MAP) sensor, the Data Link Connector (DLC), and the Heated Oxygen Sensor (HO2S). Circuit numbers and wire colors are labeled, including circuit 359 GY/R (signal return/reference through splice S137 and connectors C101F/C101M), circuit 358 LG/BK and 351 BR/W for the MAP sensor, circuit 89 O to the oxygen sensor signal, circuit 74 GY/LB, circuit 298 P/O feeding the HO2S heater from fuse E (15A, Hot in Run) in the engine compartment fuse box, circuit 511 LG from the turn/stop/hazard lamps (12V with brake pedal depressed), and circuit 57 BK ground to G101 via splice S100. Callout notes explain that the HO2S provides a voltage related to exhaust oxygen content for air/fuel regulation, and that the MAP sensor measures atmospheric pressure for fuel/air ratio, line pressure, and shift scheduling adjustments at altitude. Cross-references point to Power Distribution (page 13-4), E4OD Transmission (page 30-1), 4R70W Transmission (page 29-3), Turn/Stop/Hazard Lamps (page 90-2), Grounds (page 10-2), and component location views (section 151). Footnotes distinguish wiring with and without E4OD or 4R70W transmissions.

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Frequently asked questions

What fuse powers the heated oxygen sensor (HO2S) on the 1995 Bronco 5.0L?: Fuse E, a 15A fuse in the engine compartment fuse box, Hot in Run, feeding circuit 298 (P/O wire) to the HO2S heater. See Power Distribution page 13-4.
What wire colors connect to the MAP sensor on the 1995 Bronco 5.0L?: The MAP sensor (connector C1011) uses circuit 359 GY/R (gray/red), circuit 358 LG/BK (light green/black), and circuit 351 BR/W (brown/white).
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.
Where does the oxygen sensor ground on the 1995 Bronco?: The HO2S grounds through circuit 57 (BK wire), through connectors C1003F/C1003M and splice S100 to ground G101 (see Grounds, page 10-2).
What is the oxygen sensor signal circuit to the PCM?: Circuit 89 (orange wire) carries the HO2S signal voltage to the PCM; routing differs with or without the E4OD or 4R70W transmission, and circuit 74 GY/LB is also shown to the PCM.