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Home >> Cadillac >> 1990 >> Seville Base, 4T60/ME9 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> ECM Trouble Code Charts >> ECM Code EO12: No Distributor (Tach) Signal >> Test Conditions:
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Test Conditions:

Test Code EO12 during engine cranking operation (crank input to the ECM at system voltage) and Code EO41 is not set.

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