What wire color is the IAC valve control circuit on a 1994 Bronco 5.0L?

The IAC (Idle Air Control) valve control circuit is wire 264, W/LB (white/light blue), running from connector C1007 through C101 to PCM pin 21.

Which PCM pin controls the EGR control solenoid?

PCM pin 33, via circuit 360 BR/PK through connector C180 to the EGR Control Solenoid.

What powers the solenoids in this diagram?

All five components (EGR, AIRB, AIRD, canister purge solenoids and IAC valve) are fed by circuit 361, a red wire carrying 12V when the relay is energized.

What does the canister purge solenoid do according to this diagram?

When the PCM grounds the solenoid, fuel vapors collected by the carbon canister are released to the engine. It connects via C171 and wire 101 GY/Y to PCM pin 11.

Which PCM pins connect to the vehicle speed sensor?

PCM pin 6 (676 PK/O) and pin 3 (679 GY/BK, 0V) connect to the Vehicle Speed Sensor, covered on pages 64-1 and 64-2.

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1994 Ford Bronco/F-Series 5.0L E4OD/4R70W Engine Controls Wiring Diagram 24-2

1994 Bronco/F-Series 5.0L w/E4OD engine controls wiring, EGR/AIR/IAC solenoids (page 24-2)

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Ford 1994 Bronco/F-Series 5.0L (E4OD/4R70W) engine-controls schematic (24-2): EGR control, secondary air bypass/diverter (AIRB/AIRD), canister purge and idle air control (IAC) solenoids to PCM with wire colors.

AI caption February 2007 · Photo 240 of 1902

This is page 24-2 of the 1994 Ford Bronco/F-Series electrical/vacuum troubleshooting manual, showing an engine controls wiring diagram for the 5.0L V8 with E4OD or 4R70W transmission. It diagrams five PCM-controlled output devices, each fed by circuit 361 (Red, 12V when the relay is energized): the EGR Control Solenoid (connector C180, control wire 360 BR/PK to PCM pin 33), Secondary Air Injection Bypass (AIRB) Solenoid (C1022, 190 W/O to pin 31), Secondary Air Injection Diverter (AIRD) Solenoid (C1023, 200 BR to pin 34), Canister Purge Solenoid (C171, 101 GY/Y to pin 11), and Idle Air Control (IAC) Valve (C1007 through C101, 264 W/LB to pin 21). All controls terminate at the Powertrain Control Module connector C185. Callout notes explain each component's function: EGR vacuum regulation, secondary air routing, idle speed control via duty cycle, and canister purge operation. Additional PCM outputs shown are pin 42 (784 LB/BK) to the All-Wheel Drive circuit (page 34-3) and pins 6 and 3 (676 PK/O and 679 GY/BK) to the Vehicle Speed Sensor (pages 64-1 and 64-2). Component location grid references (e.g., 151-4 A6, 151-4 C9) are included for each device.

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Frequently asked questions

What wire color is the IAC valve control circuit on a 1994 Bronco 5.0L?: The IAC (Idle Air Control) valve control circuit is wire 264, W/LB (white/light blue), running from connector C1007 through C101 to PCM pin 21.
Which PCM pin controls the EGR control solenoid?: PCM pin 33, via circuit 360 BR/PK through connector C180 to the EGR Control Solenoid.
What powers the solenoids in this diagram?: All five components (EGR, AIRB, AIRD, canister purge solenoids and IAC valve) are fed by circuit 361, a red wire carrying 12V when the relay is energized.
What does the canister purge solenoid do according to this diagram?: When the PCM grounds the solenoid, fuel vapors collected by the carbon canister are released to the engine. It connects via C171 and wire 101 GY/Y to PCM pin 11.
Which PCM pins connect to the vehicle speed sensor?: PCM pin 6 (676 PK/O) and pin 3 (679 GY/BK, 0V) connect to the Vehicle Speed Sensor, covered on pages 64-1 and 64-2.