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Spark Output Check

  1. Check EEC-IV system for fault codes and repair if necessary. See QUICK TEST in TESTS W/CODES article. If no fault codes are retrieved, check ignition system wiring harness connectors for corrosion and tight fit. See Fig 1.
  2. If wiring and connectors are okay, use Neon Bulb Spark Tester (D89P-6666-A) to check for spark at each spark plug wire while cranking engine. If spark is consistent and equal at each spark plug (one spark per crankshaft revolution), ignition system is okay. If spark is not present, go to IGNITION SYSTEMS in SYSTEM/COMPONENT TESTS article.
Fig 1: Identifying DIS Module Pin Locations
G113251Courtesy of FORD MOTOR CO.
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