1995 Ford Bronco Ignition System Wiring Diagram - Page 21-1 (TFI, ICM, Coil)
Reference · 1987-1991 BroncoAll 175 wiring diagrams
Ignition system wiring diagram showing PCM, ignition control module, distributor and coil circuits with color-coded wires.
Part of 1987-1991 Ford Bronco Wiring Diagrams
This document is page 21-1, "Ignition System," from a Ford Bronco wiring diagram manual (uploaded as part of a 1995 Bronco diagram set). It shows the complete ignition system schematic, including the Powertrain Control Module (PCM, connector C185, cross-referenced to pages 24-5, 25-3, 25-9), the SPOUT check connector (C1019), the Ignition Control Module (ICM, connector C1021) with pins for IDM, SPOUT, PIP, PWR, COIL, and GND, the distributor (with distributor ignition shields), the ignition coil (C1008), and a radio capacitor (C1017F/C1017M) that suppresses ignition system noise. Power comes from fuse 9 (20A) in the engine compartment fuse box (page 13-5), hot only in START or RUN, via circuit 16 R/LG through splices S148 and S199. Key wire circuits include 929 PK (SPOUT), 395 GY/O (PIP), 259 O/R, 382 V/BK, 648 W/PK (tach to instrument cluster, page 60-5), 11 T/Y, and 938 BK/LG. Explanatory callouts describe the ICM switching the coil's primary current based on PCM signals, and the coil producing up to 40,000-volt pulses sent through the distributor to the spark plugs. Connectors C101M/C101F, C202F/C202M, C178M/C178F, and splices S145 and S171 are also identified.
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Frequently asked questions
- What fuse powers the ignition system on this Bronco diagram?
- Fuse 9, a 20A fuse in the Engine Compartment Fuse Box (page 13-5), which is hot in START or RUN (labeled 'NOT IN START OR RUN' when unpowered), feeding circuit 16 R/LG.
- What wire color is the SPOUT circuit?
- The SPOUT circuit is 929 PK (pink), running from the PCM through the SPOUT check connector C1019 to the Ignition Control Module.
- What does the Ignition Control Module (ICM) do according to this diagram?
- It receives a signal from the PCM which it uses to switch current on and off in the primary circuit of the Ignition Coil.
- How much voltage does the ignition coil produce?
- Each interruption of the primary current makes the Ignition Coil secondary circuit produce a high-voltage pulse of up to 40,000 volts, which is transmitted to the Distributor to fire the spark plugs.
- What is the radio capacitor for in this circuit?
- The radio capacitor (connector C1017F/C1017M, on circuit 16 R/LG) suppresses Ignition System noise.
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