What sensors are shown on this 1996 5.8L engine controls wiring diagram?

The Intake Air Temperature (IAT) sensor and the Heated Oxygen Sensor (HO2S) #11, both wired to the Powertrain Control Module (PCM).

What wire color and circuit number does the IAT sensor use?

Circuit 359, a GY/R (gray/red) wire, running through connectors C101F/C101M, C109F/C109M, splice S137, and sensor connector C164.

What does the PCM use the IAT sensor signal for?

Per the diagram's callout, the IAT sensor is a thermistor whose resistance decreases as intake air temperature increases; the PCM uses the voltage drop to calculate idle fuel delivery, spark timing, and EGR control.

What circuits connect the heated oxygen sensor to the PCM?

HO2S #11 gets heater power on circuit 361 (R wire) from splice S138, and signal/return circuits 74 (GY/LB) and 387 (R/W) run through connectors C107F/C107M and C1025F/C1025M and splices S122 and S123 to the PCM.

Which PCM pins are shown in this diagram?

PCM pins 33, 30, 31, 60, and another pin marked 33 (partially legible) along the bottom of the Powertrain Control Module box.

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1996 Ford Bronco 5.8L Engine Controls Wiring Diagram - IAT & O2 Sensor (25-4)

96 Bronco 25-4 Engine Controls 5.8L wiring diagram: intake air temperature sensor, heated oxygen sensor, PCM

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Engine controls wiring diagram for 1996 Ford Bronco 5.8L showing intake air temperature and heated oxygen sensor circuits.

AI caption July 2017 · Photo 245 of 386

This is page 25-4 of a Ford factory-style wiring diagram covering Engine Controls for the 5.8L engine, hand-marked "96" (1996 model year). The diagram shows the Intake Air Temperature (IAT) sensor circuit and the Heated Oxygen Sensor (HO2S) #11 circuit as they connect to the Powertrain Control Module (PCM). The IAT sensor connects through connector C164 with circuit 359 (GY/R wire) running through connectors C101F/C101M, C109F/C109M, and splice S137. A callout explains the IAT sensor is a thermistor that decreases resistance as intake air temperature increases; the PCM uses the voltage drop to calculate idle fuel delivery, spark timing, and EGR control. The HO2S #11 receives power on circuit 361 (R wire, hot in RUN) from splice S138 on page 25-1, with signal wires 74 (GY/LB) and 387 (R/W) passing through connectors C107F/C107M and C1025F/C1025M and splices S122 and S123 to the PCM. A second callout explains the oxygen sensor provides a voltage related to exhaust oxygen content for air/fuel ratio regulation. PCM pins shown include 33, 30, 31, and 60. Ground wires 743 (GY) and 351 (BR/W) route to C185. References point to pages 25-1 and 25-5 of the same manual set.

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Frequently asked questions

What sensors are shown on this 1996 5.8L engine controls wiring diagram?: The Intake Air Temperature (IAT) sensor and the Heated Oxygen Sensor (HO2S) #11, both wired to the Powertrain Control Module (PCM).
What wire color and circuit number does the IAT sensor use?: Circuit 359, a GY/R (gray/red) wire, running through connectors C101F/C101M, C109F/C109M, splice S137, and sensor connector C164.
What does the PCM use the IAT sensor signal for?: Per the diagram's callout, the IAT sensor is a thermistor whose resistance decreases as intake air temperature increases; the PCM uses the voltage drop to calculate idle fuel delivery, spark timing, and EGR control.
What circuits connect the heated oxygen sensor to the PCM?: HO2S #11 gets heater power on circuit 361 (R wire) from splice S138, and signal/return circuits 74 (GY/LB) and 387 (R/W) run through connectors C107F/C107M and C1025F/C1025M and splices S122 and S123 to the PCM.
Which PCM pins are shown in this diagram?: PCM pins 33, 30, 31, 60, and another pin marked 33 (partially legible) along the bottom of the Powertrain Control Module box.