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Home >> Ford >> 1992 >> Crown Victoria Base, AOD >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Controls - System/Component Tests - EEC-IV >> TFI-IV Ignition System >> No Spark From Coil Secondary (Remote Mounted TFI-IV)

No Spark From Coil Secondary (Remote Mounted TFI-IV)

  1. Turn ignition off. Connect EEC-IV Diagnostic Cable (007-00097) to EEC-IV Breakout Box (T83L-50-EECIV), negative battery terminal and TFI-IV module. See Figure . Ensure PIP OPEN/NORMAL/SPOUT OPEN switch is in NORMAL position. Apply TFI-IV overlay on breakout box.
    WARNING: DO NOT connect EEC-IV Diagnostic Cable and ECA to EEC-IV Breakout Box simultaneously.
  2. Turn ignition on. Put DVOM on DC voltage scale. Measure voltage between J5 (TFI PWR) and J7 (BAT-). If voltage is less than 10 volts DC, repair open in TFI PWR circuit to TFI-IV module. See Fig 1 . If voltage is greater than 10 volts DC, put DVOM on AC voltage scale.
    Fig 1: Remote Mounted TFI-IV Diagram (Cougar/T-Bird except 3.8L SC)
    G92F03812Courtesy of FORD MOTOR CO.
  3. Measure voltage between J7 (BAT-) and J15 (PIP) while cranking engine. If voltage is not 3.0-8.5 volts AC, go to step 6). If voltage is 3.0-8.5 volts AC, measure voltage between J7 (BAT-) and J10 (SPOUT) while cranking engine. If voltage is not 3.0-8.5 volts AC, go to step 13).
  4. If voltage is 3.0-8.5 volts AC, turn ignition off. Connect diagnostic cable to ignition coil wiring harness. Leave ignition coil disconnected. Put DVOM on DC voltage scale. Turn ignition on. Measure voltage between J2 (VBAT C) and J7 (BAT-). If voltage is not greater than 10 volts DC, repair open in ignition coil circuit.
  5. If voltage is greater than 10 volts DC, turn ignition off. Connect BAT+ lead of diagnostic cable to positive battery terminal. Connect test light to J1 (BAT+) and J3 (COIL-). Crank engine. If test light does not flash brightly, go to step 19). If test light flashes brightly, replace ignition coil.
  6. If voltage between J7 and J15 is not 3.0-8.5 volts AC in step 3), connect diagnostic cable to PIP sensor. Put DVOM on DC voltage scale. Measure voltage between J7 (BAT-) and J22 (PIP PWR) on 8-pin connector type or J7 (BAT-) and J27 (PIP PWR) on 4-pin connector type. If voltage is not greater than 10 volts DC, repair open in PIP PWR circuit.
  7. If voltage is greater than 10 volts DC, turn diagnostic cable switch to PIP OPEN position. Put DVOM on AC voltage scale. While cranking engine, measure voltage between J7 (BAT-) and J34 (PIP A) on 8-pin connector type or J7 (BAT-) and J13 (PIP) on 4-pin connector type. If voltage is not 3.0-8.5 volts AC, check PIP wiring and connector. If wiring and connector are okay, replace PIP sensor.
  8. If voltage is 3.0-8.5 volts AC, turn ignition off. Turn diagnostic cable switch to NORMAL position. Disconnect diagnostic cable from TFI-IV module. Leave diagnostic cable attached to TFI-IV module wiring harness. While cranking engine, measure voltage between J7 (BAT-) and J34 (PIP A) on 8-pin connector type or J7 (BAT-) and J13 (PIP) on 4-pin connector type.
  9. If voltage is 3.0-8.5 volts AC, replace TFI-IV module. If voltage is not 3.0-8.5 volts AC, disconnect ECA. While cranking engine, measure voltage between J7 (BAT-) and J34 (PIP A) on 8-pin connector type or J7 (BAT-) and J13 (PIP) on 4-pin connector type. If voltage is 3.0-8.5 volts AC, replace ECA.
  10. If voltage is not 3.0-8.5 volts AC, turn ignition off. Disconnect diagnostic cable from PIP sensor. Leave diagnostic cable attached to PIP sensor wiring harness. Put DVOM on DC voltage scale. Turn ignition on. Measure voltage between J7 (BAT-) and J34 (PIP A) on 8-pin connector type or J7 (BAT-) and J13 (PIP) on 4-pin connector type.
  11. If voltage is greater than 0.5 volt, repair PIP A circuit between PIP sensor and ECA. If voltage is less than 0.5 volt, measure voltage between J7 (BAT-) and J41 (PIP B). If voltage is greater than 0.5 volt, repair PIP B circuit between PIP sensor and ECA. If voltage is less than 0.5 volt, turn ignition off.
  12. Measure resistance between J7 (BAT-) and J41 (PIP B). If resistance is greater than 10,000 ohms, repair short in PIP A circuit between ECA and PIP sensor. If resistance is less than 10,000 ohms, repair short in PIP B circuit between PIP sensor and TFI-IV module.
    NOTE: If engine starts in step 13), continue testing.
  13. If voltage between J7 and J10 is not 3.0-8.5 volts AC in step 3), turn diagnostic cable switch to SPOUT OPEN position. Measure voltage between J7 (BAT-) and J10 (SPOUT) while cranking engine. If voltage is 3.0-8.5 volts AC, replace TFI-IV module. If voltage is not 3.0-8.5 volts AC, turn ignition off. Disconnect diagnostic cable from TFI-IV module. Leave diagnostic cable attached to TFI-IV module wiring harness.
  14. Turn diagnostic cable switch to NORMAL position. Put DVOM on DC voltage scale. Turn ignition on. Measure voltage between J7 (BAT-) and J10 (SPOUT). If voltage is 0.5 volt DC or more, go to step 15). If voltage is less than 0.5 volt DC, disconnect ECA. Turn ignition on. Measure voltage between J7 (BAT-) and J10 (SPOUT). If voltage is less than 0.5 volt DC, go to step 16). If voltage is greater than 0.5 volt, repair short in SPOUT circuit between ECA and TFI-IV module.
  15. If voltage is less than 0.5 volt DC in step 14), turn ignition off. Measure resistance between J7 (BAT-) and J10 (SPOUT). If resistance is greater than 10,000 ohms, go to step 16). If resistance is less than 10,000 ohms, disconnect ECA. Measure resistance between J7 (BAT-) and J10 (SPOUT). If resistance is still less than 10,000 ohms, repair short in SPOUT circuit between ECA and TFI-IV module.
  16. Turn ignition off. Disconnect ECA. Measure voltage between J7 (BAT-) and J56 (SPOUT). Go to step 18) if voltage is not 3.0-8.5 volts AC. If voltage is 3.0-8.5 volts AC, turn ignition off. Connect diagnostic cable to TFI-IV module. Measure resistance between breakout box test pin J7 (BAT-) and ECA wiring harness connector terminal No. 16 (IGN GND).
  17. If resistance is less than 5 ohms, replace ECA. If resistance is greater than 5 ohms, connect diagnostic cable to PIP sensor. Measure resistance between J7 (BAT-) and J35 (PIP A) on 8-pin connector type or J7 (BAT-) and J19 (PIP) on 4-pin connector type. If resistance is greater than 5 ohms, replace PIP sensor.
  18. If voltage is 3.0-8.5 volts AC in step 16), turn diagnostic cable switch to PIP OPEN position. Connect diagnostic cable between PIP sensor and sensor wiring harness connector. Crank engine while measuring voltage between J7 (BAT-) and J34 (PIP A) on 8-pin connector type or J7 (BAT-) and J13 (PIP) on 4-pin connector type. If voltage is 3.0-8.5 volts AC, repair PIP circuit between PIP sensor and ECA. If voltage is not 3.0-8.5 volts AC, replace PIP sensor.
  19. If test light does not flash brightly in step 5), turn ignition off. Disconnect diagnostic cable from TFI-IV module. Leave diagnostic cable attached to TFI-IV module wiring harness. Disconnect diagnostic cable from positive battery cable. Measure resistance between J3 (COIL-) and J4 (TFI COIL).
  20. If resistance is greater than 5 ohms, repair open in COIL- circuit between ignition coil and TFI-IV module. Repeat QUICK TEST. See TESTS W/CODES - EEC-IV article in the ENGINE PERFORMANCE section. If resistance is less than 5 ohms, measure resistance between J3 (COIL-) and J7 (BAT-). If resistance is less than 10,000 ohms, repair short in COIL- circuit between ignition coil and TFI-IV module.
  21. If resistance is greater than 10,000 ohms, put DVOM on DC voltage scale. Turn ignition on. Measure voltage between J3 (COIL-) and J7 (BAT-). If voltage is greater than 5.5 volts DC, repair short in COIL- circuit between ignition coil and TFI-IV module. If voltage is less than 5.5 volts DC, turn ignition off. Measure resistance between J7 (BAT-) and J9 (GND). If resistance is less than 5 ohms, replace TFI-IV module.
  22. If resistance is greater than 5 ohms, connect diagnostic cable between PIP sensor and sensor wiring harness connector. Measure resistance between J7 (BAT-) and J28 (GND) on 8-pin connector type or J7 (BAT-) and J26 (GND) on 4-pin connector type. If resistance is greater than 5 ohms, replace PIP sensor. If resistance is 5 ohms or less, repair open in GND circuit between PIP sensor and TFI-IV module. Perform QUICK TEST. See TESTS W/CODES - EEC-IV article in the ENGINE PERFORMANCE section.
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