Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSFORD1991AEROSTAR 2WD V6-183 3.0LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTRELAYS AND MODULES - POWERTRAIN MANAGEMENTRELAYS AND MODULES - IGNITION SYSTEMIGNITION CONTROL MODULEDESCRIPTION AND OPERATION
1991 Ford Aerostar 2WD V6-183 3.0L
Ignition Control Module: Description and Operation
1991 Ford Aerostar 2WD V6-183 3.0LSECTION Description and Operation
Thick Film Ignition Module:
The TFI IV ignition module has six connector pins at the wiring harness that supplies the following signals:
Run
Crank (start)
Tach (coil)
PIP (crankshaft position to ECA)
Spark Output (SPOUT from ECA)
Internal ground from the ECA to the distributor
Ignition System:
The TFI IV module supplies the spark to the distributor through the ignition coil and calculates the duration. It receives its control signal from the Electronic Engine Control (ECA) Spark Output (SPOUT).
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.