What does the Ignition Control Module (ICM) do?

Per the diagram callout, it receives a signal from the PCM which it uses to switch current on and off in the primary circuit of the Ignition Coil. Its pins are 3 IDM (FTO), 2 SPOUT, 1 PIP, 4 PWR, 5 COIL, and 6 GND.

What wire colors connect the PCM to the ignition system?

Circuits shown include 929 PK (SPOUT, with check connector C1019), 395 GY/O, 259 O/R, and 362 V/BK, plus 648 W/PK to the instrument cluster and 16 R/LG power feeds.

How much voltage does the ignition coil produce?

The callout states each interruption of the primary current makes the coil's secondary circuit produce a high-voltage pulse of up to 40,000 volts, transmitted through the distributor to the spark plugs.

What is the radio capacitor for in this circuit?

The radio capacitor (connectors C1017F/C1017M) suppresses ignition system noise, per the diagram note.

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1996 Ford Bronco Ignition System Wiring Diagram - ICM, Distributor & Coil

1996 Bronco ignition system wiring diagram with PCM, ICM, coil and distributor

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1996 Ford Bronco ignition system wiring diagram showing the PCM, ignition control module, coil and distributor circuits.

AI caption July 2017 · Photo 279 of 386

This document is page 21-1, the Ignition System wiring diagram, hand-labeled "96 Bronco." It shows the complete distributor-based ignition circuit: power arrives via a 20 A fuse (position 22) in the Engine Compartment Fuse Box (hot in start or run, referenced to page 13-5), feeding 16 R/LG wiring through splices S148 and S199 to the Ignition Control Module (ICM), Distributor, Ignition Coil, and a Radio Capacitor (connectors C1017F/C1017M) noted as suppressing ignition system noise. The Powertrain Control Module (PCM, pages 24-5/25-3) connects via pins 48, 50, 45, and 23 using circuits 929 PK (SPOUT, with a SPOUT check connector C1019), 395 GY/O, 259 O/R, and 362 V/BK, with grounded Distributor Ignition Shield sections around the PIP/SPOUT wiring. The instrument cluster (page 60-5) ties in via circuit 648 W/PK through C250 and C202F/C202M. ICM pinout (IDM, SPOUT, PIP, PWR, COIL, GND) and distributor connector pinout (PIP 8, IGN GND 7, SHIELD 2, PWR 1) are labeled, along with connectors C185, C101M/F, C178M/F, C1008, C1021 and splices S145, S171. Callouts explain that the ICM switches coil primary current from a PCM signal and that coil interruptions produce up to 40,000-volt pulses sent through the distributor to the spark plugs.

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Frequently asked questions

What fuse powers the ignition system on the 96 Bronco?: Fuse 22, a 20 A fuse in the Engine Compartment Fuse Box (hot in start or run, referenced to page 13-5), feeds the ignition circuit on 16 R/LG wiring.
What does the Ignition Control Module (ICM) do?: Per the diagram callout, it receives a signal from the PCM which it uses to switch current on and off in the primary circuit of the Ignition Coil. Its pins are 3 IDM (FTO), 2 SPOUT, 1 PIP, 4 PWR, 5 COIL, and 6 GND.
What wire colors connect the PCM to the ignition system?: Circuits shown include 929 PK (SPOUT, with check connector C1019), 395 GY/O, 259 O/R, and 362 V/BK, plus 648 W/PK to the instrument cluster and 16 R/LG power feeds.
How much voltage does the ignition coil produce?: The callout states each interruption of the primary current makes the coil's secondary circuit produce a high-voltage pulse of up to 40,000 volts, transmitted through the distributor to the spark plugs.
What is the radio capacitor for in this circuit?: The radio capacitor (connectors C1017F/C1017M) suppresses ignition system noise, per the diagram note.