What PCM pin does the Idle Air Control Valve connect to on the 4.9L?

The IAC valve connects via circuit 264 W/LB (white/light blue), passing through connectors C101 and C185, to PCM pin 21.

What wire color and circuit feed the EGR Control Solenoid signal to the PCM?

Circuit 360, a BR/PK (brown/pink) wire, runs from the EGR Control Solenoid (connector C180) to PCM pin 33.

What circuit powers the emission solenoids and IAC valve in this diagram?

Circuit 361 (R, red) comes from splice S122 on page 23-1, passes through C101 and splice S144, and provides 12V (relay energized) to the EGR solenoid, AIRD solenoid, AIRB solenoid, and IAC valve.

What do the AIRB and AIRD solenoids do according to this diagram?

The AIRD (diverter) solenoid directs secondary air to the exhaust manifold or catalytic converter; the AIRB (bypass) solenoid directs secondary air to exhaust or bypasses it to atmosphere.

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 on pages 30-1 and 30-2; pin 12 (784 LB/BK, E4OD only) goes to all-wheel drive on page 34-3.

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

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

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Engine controls wiring diagram for 4.9L showing EGR control, secondary air injection solenoids and idle air control valve circuits.

AI caption August 2018 · Photo 338 of 386

This is page 23-2 of a Ford engine controls wiring diagram set for the 4.9L engine, uploaded as part of a 1996 Ford Bronco document album. The diagram shows power circuit 361 (R, red) arriving from splice S122 on page 23-1, passing through connector C101 and splice S144 to feed four emission/idle control devices: the EGR Control Solenoid (connector C180), the Secondary Air Injection Diverter (AIRD) Solenoid (C1023), the Secondary Air Injection Bypass (AIRB) Solenoid (C1022), and the Idle Air Control Valve (C100/C1007). Each device's control-side wire returns to the Powertrain Control Module (PCM): circuit 360 BR/PK to pin 33, 200 BR to pin 11, 190 W/O to pin 51 (with E4OD), and 264 W/LB via C101 and C185 to pin 21. Callout boxes explain each component's function, including that the IAC valve controls idle speed via PCM duty cycles. The lower portion lists PCM output pins 12 and 38–41 with circuit numbers and wire colors (784 LB/BK, 925 W/Y, 315 P/O, 237 O/Y, 924 BR/O, 923 O/BK, 480 P/Y, 199 LB/Y, 911 W/LG, 224 T/W) routing to the E4OD transmission (pages 30-1, 30-2) and all-wheel drive (page 34-3).

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Frequently asked questions

What PCM pin does the Idle Air Control Valve connect to on the 4.9L?: The IAC valve connects via circuit 264 W/LB (white/light blue), passing through connectors C101 and C185, to PCM pin 21.
What wire color and circuit feed the EGR Control Solenoid signal to the PCM?: Circuit 360, a BR/PK (brown/pink) wire, runs from the EGR Control Solenoid (connector C180) to PCM pin 33.
What circuit powers the emission solenoids and IAC valve in this diagram?: Circuit 361 (R, red) comes from splice S122 on page 23-1, passes through C101 and splice S144, and provides 12V (relay energized) to the EGR solenoid, AIRD solenoid, AIRB solenoid, and IAC valve.
What do the AIRB and AIRD solenoids do according to this diagram?: The AIRD (diverter) solenoid directs secondary air to the exhaust manifold or catalytic converter; the AIRB (bypass) solenoid directs secondary air to exhaust or bypasses it to atmosphere.
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 on pages 30-1 and 30-2; pin 12 (784 LB/BK, E4OD only) goes to all-wheel drive on page 34-3.