What PCM pin does the EGR Control Solenoid connect to on the 4.9L?

The EGR Control Solenoid output is circuit 360 (BR/PK wire) which connects to PCM pin 33.

What wire color and circuit feed the Idle Air Control Valve signal to the PCM?

Circuit 264 with a W/LB (white/light blue) wire runs from the IAC valve through connectors C101 and C185 to PCM pin 21.

What does the Idle Air Control Valve do according to this diagram?

It controls idle speed during all modes of engine operation. Duty cycles are sent by the PCM, which controls a solenoid that opens or closes air bypass depending on the signal received.

Which circuit powers the EGR, AIRD, AIRB solenoids and IAC valve?

Circuit 361 (Red wire), fed from splice S122 on page 23-1 through connector C101 and splice S144, supplies 12V (relay energized) to all four devices.

Which PCM pins go to the E4OD transmission?

PCM pins 38 (925 W/Y), 19 (315 P/O), 52 (237 O/Y), 55 (924 BR/O), 42 (923 O/BK), 53 (480 P/Y), 30 (199 LB/Y), 32 (911 W/LG), and 41 (224 T/W) route to the E4OD transmission, shown on pages 30-1 and 30-2.

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Ford 4.9L Engine Controls Wiring Diagram 23-2 - EGR, AIRB/AIRD, IAC, PCM Pins

Engine Controls wiring diagram, 4.9L, page 23-2, EGR, air injection and idle air control solenoids

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Reference · 1992-1996 BroncoAll 411 wiring diagrams

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Ford 4.9L engine controls wiring diagram of EGR control, secondary air injection diverter/bypass and idle air control valve circuits.

Part of 1992-1996 Ford Bronco Wiring Diagrams

AI caption August 2018 · Photo 351 of 378

This is page 23-2 of a Ford factory-style wiring diagram covering Engine Controls for the 4.9L engine. It shows the power distribution from splice S122 (page 23-1) on circuit 361 (Red), through connector C101 and splice S144, feeding four emission/engine control devices, each energized at 12V when the relay is energized: the EGR Control Solenoid (connector C180, output circuit 360 BR/PK to PCM pin 33), the Secondary Air Injection Diverter (AIRD) Solenoid (connector C1023, circuit 200 BR to pin 11), the Secondary Air Injection Bypass (AIRB) Solenoid (connector C1022, circuit 190 W/O to pin 51), and the Idle Air Control Valve (connectors C100/C1007, circuit 264 W/LB through C101 and C185 to pin 21). Explanatory callouts describe each component's function, including how the IAC valve controls idle speed via PCM duty cycles. The lower portion of the Powertrain Control Module (solid state, with E4OD) shows pin 12 (circuit 784 LB/BK, E4OD only) going to All-Wheel Drive on page 34-3, and pins 38, 19, 52, 55, 42, 53, 30, 32, and 41 with their wire circuits/colors routing to the E4OD transmission on pages 30-1 and 30-2. Useful for diagnosing EGR, secondary air injection, idle control, and PCM-to-transmission wiring.

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Frequently asked questions

What PCM pin does the EGR Control Solenoid connect to on the 4.9L?: The EGR Control Solenoid output is circuit 360 (BR/PK wire) which connects to PCM pin 33.
What wire color and circuit feed the Idle Air Control Valve signal to the PCM?: Circuit 264 with a W/LB (white/light blue) wire runs from the IAC valve through connectors C101 and C185 to PCM pin 21.
What does the Idle Air Control Valve do according to this diagram?: It controls idle speed during all modes of engine operation. Duty cycles are sent by the PCM, which controls a solenoid that opens or closes air bypass depending on the signal received.
Which circuit powers the EGR, AIRD, AIRB solenoids and IAC valve?: Circuit 361 (Red wire), fed from splice S122 on page 23-1 through connector C101 and splice S144, supplies 12V (relay energized) to all four devices.
Which PCM pins go to the E4OD transmission?: PCM pins 38 (925 W/Y), 19 (315 P/O), 52 (237 O/Y), 55 (924 BR/O), 42 (923 O/BK), 53 (480 P/Y), 30 (199 LB/Y), 32 (911 W/LG), and 41 (224 T/W) route to the E4OD transmission, shown on pages 30-1 and 30-2.