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Home >> Chevrolet >> 1990 >> Caprice Base, 5.7 7 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - 4.3L TBI >> Pcm/BCM Code Charts >> Code 42, Est Circuit Open Or Grounded >> Test Number 5)

Test Number 5)

This step confirms Code 42 is a faulty ECM and not an intermittent problem in EST or by-pass circuits.

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