What wire color is the Idle Air Control (IAC) valve control circuit on the 5.8L?

The IAC valve (connector C1007) control wire is circuit 264 W/LB (white/light blue), running to the PCM. Its power side is 12V, relay energized.

What are the fuel injector connector numbers on the 5.8L engine controls diagram?

The injectors use connectors C190 (#1), C191 (#2), C192 (#3), C193 (#4), C194 (#5), C195 (#6), C196 (#7), plus C197 for #8/the fuel injectors, with 556 W and 555 T circuits and 12V relay-energized power.

Which wires run from the PCM to the E4OD transmission?

The diagram shows nine circuits to the E4OD transmission (pages 30-1, 30-2): 925 W/Y, 315 P/O, 237 O/Y, 924 BR/O, 923 O/BK, 480 P/Y, 199 LB/Y, 911 W/LG, and 224 T/W.

What does the EVAP canister purge valve do according to this diagram?

When the PCM grounds the solenoid, fuel vapors collected by the carbon canister are released to the engine. The purge valve connects at C171 with control wire 101 GY/Y.

What are the Vehicle Speed Sensor (VSS) wire colors?

The VSS circuits shown are 679 GY/BK and 678 PK/O, with further detail on pages 64-1.

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1995 Ford Bronco 5.8L Engine Controls Wiring Diagram - PCM, Injectors, IAC (25-2)

Wiring diagram 25-2 Engine Controls 5.8L showing AIR solenoids, IAC, EVAP purge, fuel injectors and relays to the PCM

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Engine controls wiring diagram for the 5.8L, mapping secondary air injection, idle air control, EVAP purge, and fuel injector circuits to the PCM.

AI caption April 2011 · Photo 956 of 2216

This document is page 25-2 of a Ford factory-style wiring diagram (EVTM format) covering the Engine Controls system for the 5.8L engine. It shows the 12V relay-energized power feed (circuit 361 R) from S136 on page 25-1 through connectors C101M/C101F and splice S149, continuing to C180 on page 25-3. Components diagrammed include the Secondary Air Injection Bypass (AIRB) solenoid (C1022), Secondary Air Injection Diverter (AIRD) solenoid (C1023), EVAP canister purge valve (C171), Idle Air Control (IAC) valve (C1007), and all eight fuel injectors (C190–C197). Descriptive callouts explain each component's function, such as the IAC valve controlling idle speed via PCM duty cycles and the injectors metering fuel at each intake port. Control-side wires (190 W/O, 200 BR, 101 GY/Y, 264 W/LB, 556 W, 555 T) route to numbered pins on the solid-state Powertrain Control Module (PCM). The bottom of the page shows PCM pinouts and circuits leading to the All-Wheel Drive system (784 LB/BK, page 34-1), the Vehicle Speed Sensor (679 GY/BK, 678 PK/O, pages 64-1), and nine wires to the E4OD transmission (pages 30-1, 30-2), including 925 W/Y, 315 P/O, 237 O/Y, 924 BR/O, 923 O/BK, 480 P/Y, 199 LB/Y, 911 W/LG, and 224 T/W.

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Frequently asked questions

What wire color is the Idle Air Control (IAC) valve control circuit on the 5.8L?: The IAC valve (connector C1007) control wire is circuit 264 W/LB (white/light blue), running to the PCM. Its power side is 12V, relay energized.
What are the fuel injector connector numbers on the 5.8L engine controls diagram?: The injectors use connectors C190 (#1), C191 (#2), C192 (#3), C193 (#4), C194 (#5), C195 (#6), C196 (#7), plus C197 for #8/the fuel injectors, with 556 W and 555 T circuits and 12V relay-energized power.
Which wires run from the PCM to the E4OD transmission?: The diagram shows nine circuits to the E4OD transmission (pages 30-1, 30-2): 925 W/Y, 315 P/O, 237 O/Y, 924 BR/O, 923 O/BK, 480 P/Y, 199 LB/Y, 911 W/LG, and 224 T/W.
What does the EVAP canister purge valve do according to this diagram?: When the PCM grounds the solenoid, fuel vapors collected by the carbon canister are released to the engine. The purge valve connects at C171 with control wire 101 GY/Y.
What are the Vehicle Speed Sensor (VSS) wire colors?: The VSS circuits shown are 679 GY/BK and 678 PK/O, with further detail on pages 64-1.