What fuse powers the heated oxygen sensor on a 1994 Bronco 5.0L?

A 15A fuse in position E of the engine compartment fuse box, hot in run, feeds circuit 298 (P/O) to the heated oxygen sensor (HO2S). See Power Distribution, page 13-4.

What wire colors go to the MAP sensor on the 1994 Bronco/F-Series 5.0L?

The MAP sensor (connector C1011) uses circuit 359 GY/R, circuit 358 LG/BK, and circuit 351 BR/W to the PCM.

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 heated oxygen sensor ground on the 1994 Bronco 5.0L?

Through circuit 57 (BK) via connector C1003 and splice S100 to ground G101 (see Grounds, page 10-3).

Which PCM connector pins are shown on this engine controls page?

PCM connector C185 pins *45, 26, 46, 2, 49, and *29/44** (asterisks denote with/without E4OD or 4R70W transmission).

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1994 Ford Bronco/F-Series 5.0L Engine Controls Wiring Diagram (24-6) MAP HO2S

1994 Bronco/F-Series Engine Controls 5.0L wiring diagram, page 24-6

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Ford 1994 Bronco/F-Series 5.0L engine controls wiring diagram showing PCM, MAP sensor, oxygen sensor and color-coded circuits.

AI caption February 2007 · Photo 244 of 1902

This is page 24-6 of the 1994 Ford Bronco/F-Series wiring diagram manual, covering Engine Controls for the 5.0L engine. The diagram shows wiring between the Powertrain Control Module (PCM, connector C185) and several sensors: the Manifold Absolute Pressure (MAP) sensor at connector C1011, which measures atmospheric pressure for fuel/air ratio, line pressure, and shift scheduling adjustments, and the Heated Oxygen Sensor (HO2S) at connector C1025, which provides a voltage related to exhaust oxygen content for air/fuel regulation. The HO2S heater is fed by circuit 298 (P/O) from a 15A fuse (position E) in the engine compartment fuse box, hot in run. Key circuits include 359 GY/R (reference voltage to MAP, VIP Data Link Connector C198, and E4OD/4R70W transmissions), 89 O (signal return), 358 LG/BK (MAP signal), 351 BR/W, 74 GY/LB, 511 LG (brake pedal signal from turn/stop/hazard lamps), and 57 BK (HO2S ground to G101). Footnotes distinguish wiring with and without E4OD or 4R70W transmissions. Cross-references point to Power Distribution (page 13-4), transmissions (pages 29-3 and 30-1), turn/stop/hazard lamps (page 90-2), and grounds (page 10-3).

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Frequently asked questions

What fuse powers the heated oxygen sensor on a 1994 Bronco 5.0L?: A 15A fuse in position E of the engine compartment fuse box, hot in run, feeds circuit 298 (P/O) to the heated oxygen sensor (HO2S). See Power Distribution, page 13-4.
What wire colors go to the MAP sensor on the 1994 Bronco/F-Series 5.0L?: The MAP sensor (connector C1011) uses circuit 359 GY/R, circuit 358 LG/BK, and circuit 351 BR/W to the PCM.
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 heated oxygen sensor ground on the 1994 Bronco 5.0L?: Through circuit 57 (BK) via connector C1003 and splice S100 to ground G101 (see Grounds, page 10-3).
Which PCM connector pins are shown on this engine controls page?: PCM connector C185 pins *45, 26, 46, 2, 49, and *29/44** (asterisks denote with/without E4OD or 4R70W transmission).