Ford Bronco 5.8L Engine Controls Wiring Diagram: MAP & O2 Sensor (Page 25-4)

This is page 25-4 of a Ford factory-style wiring diagram set covering Engine Controls for the 5.8L engine, applicable to Bronco, Lightning, and F-Series trucks (with under-8500 lb and over-8500 lb GVW variants distinguished by asterisk footnotes). The diagram shows the Manifold Absolute Pressure (MAP) sensor (connector C1011) with a note explaining it measures atmospheric pressure for the PCM to adjust fuel/air ratio, transmission line pressure, and shift scheduling at altitude. It also shows the Heated Oxygen Sensor (HO2S), which provides a voltage related to exhaust oxygen content, powered through a 15A fuse (position E) in the engine compartment fuse box on circuit 298 P/O (hot in run). Signal circuits include 359 GY/R (MAP signal, also feeding the VIP Data Link Connector C198 and E4OD transmission on page 30-1), 358 LG/BK, 351 BR/W (return/ground via splice S163 and connector C185), 89 O (reference), and 74 GY/LB (HO2S signal to PCM pin 49). Ground is via 57 BK to G101/G100. PCM pins 45, 26, 46, 49, and 29 are shown. Cross-references point to Power Distribution page 13-4, Grounds pages 10-3/10-5, and E4OD Transmission page 30-1.