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 MANUALSFORD1988TAURUS L4-153 2.5L HSCREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTIGNITION SYSTEMRELAYS AND MODULES - IGNITION SYSTEMIGNITION CONTROL MODULEDESCRIPTION AND OPERATION
1988 Ford Taurus L4-153 2.5L HSC
Ignition Control Module: Description and Operation
1988 Ford Taurus L4-153 2.5L HSCSECTION Description and Operation
Thick Film Ignition Module:
The TFI IV ignition module, Fig. 14, 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 ECA (SPOUT) Fig. 29.
NOTE: Some later models use a remote module (Closed Bowl Distributors/CBD). It is located in the engine compartment (Refer to "COMPONENT LOCATIONS"). The operation is essentially the same with the exception of the CBD has a wiring harness between the ignition module and the distributor.
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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.