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Chevrolet
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1998
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C3500 HD 7.4 J, Automatic
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Repair and Diagnosis
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Engine Performance
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System
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Engine Controls - System & Component Testing 7.4L
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Computerized Engine Controls
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Control Unit
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Notes
Control Unit: Notes
NOTE:
To identify circuits referenced in the following ground and power tests, use wiring diagram in
WIRING DIAGRAMS - 7.4L
article.