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GMC
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1994
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Safari Van Cargo Extended, 4.3 W, AWD
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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 - Electronic Transmission
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Trouble Code Charts
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Code 74, Transmission Input Speed Error
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Diagnostic Aids
July 1:
So it begins
. Don't worry, this is not in the correct legal jurisdiction!
Diagnostic Aids
Check for poor connections in PCM/TCM related circuits.
Fig 1: Code 74 Schematic Transmission Input Speed Error
Fig 2: Code 74 Schematic Flow Chart Transmission Input Speed Error