What fuse powers the fuel injectors on the 4.9L engine?

A 15A HOT IN RUN fuse (position E) in the engine compartment fuse box (see page 13-4) feeds circuit 361 Red to the injectors and canister purge solenoid.

What wire colors go to the fuel injectors on the 4.9L?

All six injectors get 12V (relay energized) on circuit 361 Red; the PCM control side uses circuit 556 White (injectors #6, #4, #2 via splice S159 to PCM pin 59) and circuit 555 Tan (injectors #5, #3, #1 via splice S160 to PCM pin 58).

Which PCM pin controls the canister purge solenoid?

The canister purge solenoid grounds through circuit 101 GY/Y to PCM pin 31; per the callout, when the PCM grounds the solenoid, fuel vapors collected by the carbon canister are released to the engine.

How is the heated oxygen sensor (HO2S) wired?

The HO2S receives 12V (RUN) on circuit 298 P/O via S105, signal on circuit 89 Orange through C1003 and C1025, return on 74 GY/LB to PCM pin 29, and grounds on 57 BK through S100 to G101 (Grounds page 10-3).

Which connectors are used for the fuel injectors?

Injector connectors are C190 (#1), C191 (#2), C192 (#3), C193 (#4), C194 (#5), and C195 (#6); the canister purge solenoid uses C171.

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Ford 4.9L Engine Controls Wiring Diagram 23-3: Fuel Injectors, HO2S, Purge

Engine Controls wiring diagram, 4.9L, page 23-3, canister purge solenoid and fuel injectors

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Ford 4.9L engine controls wiring diagram showing canister purge solenoid, fuel injector and heated oxygen sensor circuits with color codes.

Part of 1992-1996 Ford Bronco Wiring Diagrams

AI caption August 2018 · Photo 352 of 378

This is page 23-3 of a Ford factory-style wiring diagram covering Engine Controls for the 4.9L engine, uploaded to a 1996 Ford Bronco gallery. The diagram shows the fuel injector and emissions control circuits: power originates from a HOT IN RUN 15A fuse (position E) in the engine compartment fuse box (referenced to Power Distribution, page 13-4), feeding circuit 361 (Red) through connector C125 and splice S158 to the canister purge solenoid and all six fuel injectors (#1-#6) via connectors C190-C195. Each injector receives 12V when the relay is energized; the PCM controls the ground side via circuit 556 (White) through splice S159 to PCM pin 59, and circuit 555 (Tan) through splice S160 to pin 58. The canister purge solenoid grounds through circuit 101 GY/Y to PCM pin 31. The heated oxygen sensor (HO2S) circuit shows 298 P/O power (12V in RUN), 89 Orange signal through C1003/C1025, and 74 GY/LB return to PCM pin 29, with grounds via 57 BK through S100 to G101 (Grounds page 10-3). Callouts explain the purge solenoid, injector, and HO2S functions. Useful for diagnosing injector, purge solenoid, and O2 sensor wiring faults.

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Frequently asked questions

What fuse powers the fuel injectors on the 4.9L engine?: A 15A HOT IN RUN fuse (position E) in the engine compartment fuse box (see page 13-4) feeds circuit 361 Red to the injectors and canister purge solenoid.
What wire colors go to the fuel injectors on the 4.9L?: All six injectors get 12V (relay energized) on circuit 361 Red; the PCM control side uses circuit 556 White (injectors #6, #4, #2 via splice S159 to PCM pin 59) and circuit 555 Tan (injectors #5, #3, #1 via splice S160 to PCM pin 58).
Which PCM pin controls the canister purge solenoid?: The canister purge solenoid grounds through circuit 101 GY/Y to PCM pin 31; per the callout, when the PCM grounds the solenoid, fuel vapors collected by the carbon canister are released to the engine.
How is the heated oxygen sensor (HO2S) wired?: The HO2S receives 12V (RUN) on circuit 298 P/O via S105, signal on circuit 89 Orange through C1003 and C1025, return on 74 GY/LB to PCM pin 29, and grounds on 57 BK through S100 to G101 (Grounds page 10-3).
Which connectors are used for the fuel injectors?: Injector connectors are C190 (#1), C191 (#2), C192 (#3), C193 (#4), C194 (#5), and C195 (#6); the canister purge solenoid uses C171.