Ford EEC-IV TFI Module Diagnostic Worksheet - Ignition No-Spark Test Steps

This document is a 14-step diagnostic worksheet for testing the Thick Film Ignition (TFI) module and related ignition components on Ford EEC-IV engine management systems. It lists required tools (12V test light, DVOM, straight pins) and warns to disconnect the fuel injectors before starting to prevent flooding the engine. The steps guide the technician through checking voltage at the positive and negative coil terminals (12V desired, Key On/Engine Off), watching for test-light flicker at the negative coil during cranking, and measuring ignition coil resistances: primary coil .5-1.5 ohms, secondary coil 7K-15K ohms, and infinite ohms path to ground. It then covers back-probing the TFI module harness connector with straight pins to verify Run (12V), Coil (12V), and Start (8-10V) voltages, with a connector pin diagram labeling PIP, SPOUT, START, RUN, COIL, and IGN GND. Further steps check distributor-to-engine ground, TFI-to-distributor ground at Pin 6, Hall effect device output at the SPOUT connector during cranking (5-7V desired), and follow-up tests at ECA Pin #56, including checking the blue PIP wire continuity and substituting a processor. The worksheet concludes with logic for condemning the Hall effect device or the TFI module, and a bold warning not to shortcut the test to avoid destroying a new module, Hall effect device, or processor.