What circuit powers the fuel injectors on the 4-cylinder turbo EEC system?

All four fuel injectors are fed by circuit 361, a Red wire, which branches through splice S137 and connector C150.

What are the injector control wire colors and ECA pins?

Injectors 1 and 2 use circuit 95 T/R (splice S136, ECA pin 58); injectors 3 and 4 use circuit 96 T/O (splice S135, ECA pin 59).

Which ECA pins connect to the TFI Ignition Module?

Pin 16 via circuit 259 BK/O, pin 36 via shielded circuit 324 Y/LG through connector C275, and pin 56 via circuit 349 DG.

How is the Exhaust Gas Oxygen (EGO) sensor wired?

The EGO sensor signal is circuit 94 DG/P to ECA pin 29, with circuit 89 O to pin 49; the sensor/ECA ground is 57 BK to ground G119 (ECA pin 20).

What ignition feed does the ECA receive?

Circuit 11 DG/Y from the ignition feeds ECA pin 4.

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1986 Ford Mustang 2.3 Turbo EEC Wiring Diagram - ECA, Injectors, TFI (Page 113)

Electronic engine control wiring diagram for 4-cylinder turbo fuel injector circuits

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Wiring diagram of electronic engine control for a 4-cylinder turbo, showing fuel injectors, EGR solenoid, idle speed actuator, and exhaust gas oxygen sensor.

AI caption April 2012 · Photo 15 of 54

This is page 113 of a Ford electrical/vacuum troubleshooting manual (EVTM) covering the Electronic Engine Control (EEC) system for the 4-cylinder turbo engine — from a 1986 Ford Mustang manual set based on companion pages. The wiring diagram shows the Electronic Control Assembly (ECA) and its connections: circuit 361 (Red) power feed through connectors C150/C197 and splice S137 to the EGR Control Solenoid, a diode, the Idle Speed Actuator, and four fuel injectors. Injector control wires are circuit 95 T/R (injectors 1–2, via splice S136, ECA pin 58) and circuit 96 T/O (injectors 3–4, via splice S135, ECA pin 59). Ignition feed is circuit 11 DG/Y to ECA pin 4. Other ECA pins shown: pin 35 (362 Y from EGR solenoid), pin 21 (67 GY/W from idle speed actuator), pin 29 (94 DG/P to the Exhaust Gas Oxygen sensor), pin 49 (89 O), pin 20 (57 BK ground to G119), pins 16/36/56 (259 BK/O, shielded 324 Y/LG through C275, and 349 DG to the TFI Ignition Module), and pins 30/32 (376 Y/R and 544 P to fog lamps/fuel selection). Faded text columns describe how the circuit works, component locations, and sensing devices.

This document covers 1986, which may differ from this 1978 Ford Bronco.

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Frequently asked questions

What circuit powers the fuel injectors on the 4-cylinder turbo EEC system?: All four fuel injectors are fed by circuit 361, a Red wire, which branches through splice S137 and connector C150.
What are the injector control wire colors and ECA pins?: Injectors 1 and 2 use circuit 95 T/R (splice S136, ECA pin 58); injectors 3 and 4 use circuit 96 T/O (splice S135, ECA pin 59).
Which ECA pins connect to the TFI Ignition Module?: Pin 16 via circuit 259 BK/O, pin 36 via shielded circuit 324 Y/LG through connector C275, and pin 56 via circuit 349 DG.
How is the Exhaust Gas Oxygen (EGO) sensor wired?: The EGO sensor signal is circuit 94 DG/P to ECA pin 29, with circuit 89 O to pin 49; the sensor/ECA ground is 57 BK to ground G119 (ECA pin 20).
What ignition feed does the ECA receive?: Circuit 11 DG/Y from the ignition feeds ECA pin 4.