What engines does this start/ignition wiring diagram cover?

The diagram is labeled for the 5.0L and 5.8L engines.

What wire color feeds the ignition coil and TFI ignition module power?

Circuit 16 R/LG (red/light green) feeds the ignition coil, TFI ignition module, radio capacitor, and EEC power relay through splices S126 and S123 and connector C113.

What is the part number of the ignition suppression resistor?

E9DB-14A601-FA, shown feeding circuit 11 DG/Y to the TFI ignition module/distributor.

Which circuits connect the TFI ignition module to the EEC module?

Shielded circuits 48, 398 DB, 259 BK/O, and 324 Y/LG run between the TFI ignition module and the EEC module, with 324 Y/LG also going to a timing test lead.

Where is the EEC power relay documented?

The diagram references the EEC power relay and the EEC module on page 24-1, the instrument cluster on page 60-1, and connector C202/splice S214 on pages 20-1 and 20-2.

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1990 Ford Bronco 5.0L/5.8L Start Ignition Wiring Diagram - TFI Module (20-4)

Ford 5.0L and 5.8L start/ignition wiring diagram page 20-4 with TFI module, coil and EEC

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Start/ignition wiring (20-4) for 5.0L/5.8L showing TFI ignition module, ignition coil, distributor, suppression resistor, EEC module and power relay with wire codes R/LG, DG/Y, DB.

AI caption July 2012 · Photo 1423 of 1799

This document is page 20-4 of a Ford factory electrical/vacuum troubleshooting manual, covering the Start/Ignition circuit for 5.0L and 5.8L engines. It is a wiring diagram showing the TFI (Thick Film Ignition) ignition module mounted on the distributor, its shielded wiring to the Electronic Engine Control (EEC) module (referenced on page 24-1), the EEC power relay, ignition coil, coil wire, radio capacitor, timing test lead, and ignition suppression resistor (part number E9DB-14A601-FA). Wire circuits are labeled with circuit numbers and color codes: 11 DG/Y (dark green/yellow), 16 R/LG (red/light green), 32 and 648 R/LB (red/light blue), 48, 57 BK (black), 398 DB (dark blue), 259 BK/O (black/orange), and 324 Y/LG (yellow/light green). Connectors shown include C113, C202, C250, C106, and C118; splices include S108, S109, S123, S126, and references to S214; ground G104 is shown at the EEC module shield. Cross-references point to connector C202 and splice S214 on pages 20-1 and 20-2, the instrument cluster on page 60-1, and the EEC module and power relay on page 24-1. This diagram helps diagnose no-start, no-spark, and ignition timing issues on TFI-equipped 5.0L/5.8L trucks.

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Frequently asked questions

What engines does this start/ignition wiring diagram cover?: The diagram is labeled for the 5.0L and 5.8L engines.
What wire color feeds the ignition coil and TFI ignition module power?: Circuit 16 R/LG (red/light green) feeds the ignition coil, TFI ignition module, radio capacitor, and EEC power relay through splices S126 and S123 and connector C113.
What is the part number of the ignition suppression resistor?: E9DB-14A601-FA, shown feeding circuit 11 DG/Y to the TFI ignition module/distributor.
Which circuits connect the TFI ignition module to the EEC module?: Shielded circuits 48, 398 DB, 259 BK/O, and 324 Y/LG run between the TFI ignition module and the EEC module, with 324 Y/LG also going to a timing test lead.
Where is the EEC power relay documented?: The diagram references the EEC power relay and the EEC module on page 24-1, the instrument cluster on page 60-1, and connector C202/splice S214 on pages 20-1 and 20-2.