What fuse powers the Malfunction Indicator Lamp (MIL) circuit on the 1996 5.8L?

Fuse 17, a 10A fuse in the fuse panel, hot in START or RUN, feeding circuit 640 R/Y (see Power Distribution page 13-11).

What wire colors connect the MIL to the PCM?

Circuit 658 PK/LG (pink/light green) runs from the MIL in the instrument cluster through connectors C202F/C202M to the Powertrain Control Module.

Which heated oxygen sensors are shown and what are their connectors?

HO2S #12 at connectors C1069F/C1069M and HO2S #21 at connectors C1028F/C1028M.

When does the MIL light, according to this diagram?

The indicator lights with the ignition switch in ON prior to cranking and goes off when the engine starts; if a fault develops in the Engine Control System, the PCM turns the indicator back on.

What do the heated oxygen sensors do per this diagram?

They provide a voltage related to the oxygen content of exhaust gases to the PCM for regulating air/fuel ratio.

Home/ Registry/ Ford/ Bronco/ 1992-1996/ “Buckin Bronco”/ Photo supermotors.net/registry/media/1110735

1996 Ford 5.8L Engine Controls Wiring Diagram - MIL & O2 Sensor Circuits 25-5

96 Bronco 25-5 Engine Controls 5.8L under 8500 GVW wiring diagram: MIL, heated oxygen sensors, transmission controls, PCM

‹ ›

Engine controls wiring diagram for 1996 Ford Bronco 5.8L showing malfunction indicator lamp and heated oxygen sensor circuits.

AI caption July 2017 · Photo 255 of 386

This is page 25-5 of a 1996 Ford wiring diagram set (EVTM style), covering Engine Controls for the 5.8L engine, under 8500 GVW. The diagram shows the Malfunction Indicator Lamp (MIL) circuit and the heated oxygen sensor (HO2S) circuits. Power comes from fuse 17 (10A) in the fuse panel (hot in start or run) through circuit 640 R/Y and splice S215 to the instrument cluster's MIL, then via circuit 658 PK/LG through connectors C202F/C202M to the Powertrain Control Module (PCM). A callout explains the MIL lights with the ignition switch ON prior to cranking, goes off when the engine starts, and is turned back on by the PCM if a fault develops. Two heated oxygen sensors are shown: HO2S #12 (connectors C1069F/C1069M) and HO2S #21 (connectors C1028F/C1028M), fed by circuits 359 GY/R (GN/R) and 361 R, with signal circuits 392 R/LG, 393 W/BK, 388 V/LB, and 94 R/BK returning to the PCM through splices S146, S169, S125, S126 and connectors C110, C101M, and C1027. Cross-references point to Power Distribution (page 13-11), Fuse Panel (pages 13-19), Instrument Cluster (page 60-3), and Transmission Controls E4OD (pages 30-1, 30-2).

Is this accurate? Sign in to help verify it.

Frequently asked questions

What fuse powers the Malfunction Indicator Lamp (MIL) circuit on the 1996 5.8L?: Fuse 17, a 10A fuse in the fuse panel, hot in START or RUN, feeding circuit 640 R/Y (see Power Distribution page 13-11).
What wire colors connect the MIL to the PCM?: Circuit 658 PK/LG (pink/light green) runs from the MIL in the instrument cluster through connectors C202F/C202M to the Powertrain Control Module.
Which heated oxygen sensors are shown and what are their connectors?: HO2S #12 at connectors C1069F/C1069M and HO2S #21 at connectors C1028F/C1028M.
When does the MIL light, according to this diagram?: The indicator lights with the ignition switch in ON prior to cranking and goes off when the engine starts; if a fault develops in the Engine Control System, the PCM turns the indicator back on.
What do the heated oxygen sensors do per this diagram?: They provide a voltage related to the oxygen content of exhaust gases to the PCM for regulating air/fuel ratio.