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Home >> Ford >> 1981 >> Thunderbird Base, 5.0L Eng VIN F >> Repair and Diagnosis >> Engine Performance >> Ignition System >> MOTORCRAFT EEC III Ignition System >> Testing >> Module Operation Check
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Module Operation Check

  1. Disconnect 3-pin control module connector. Connect positive voltmeter lead to wiring harness terminal that mates with control module green wire. Attach negative lead to ground. Turn ignition switch to "RUN" position and check voltage.
  2. If reading is greater than 90 percent of battery voltage, turn switch to "OFF" position and replace ignition control module. If reading is less than 90 percent of battery voltage, turn switch to "OFF" position and proceed to next test.
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