Mike's Workshop Manuals
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GMC
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1991
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Forward Control 6.2 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 - Tests W/Codes - Transmission
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Component Check Charts
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Force Motor Circuit Check
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Diagnostic Aids
Diagnostic Aids
Check for poor connections at PCM/TCM, especially at transmission pass-thru connector.
Fig 1: Force Motor Circuit Check Schematic
Fig 2: Force Motor Circuit Check Flow Chart