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Home › Chevrolet › 1994 › Astro Van Cargo Extended, 4.3 Z › Repair and Diagnosis › Engine Performance › System › Engine Controls - Tests W/Codes - Electronic Transmission › Trouble Code Charts › Code 74, Transmission Input Speed Error › Diagnostic Aids

Diagnostic Aids

Check for poor connections in PCM/TCM related circuits.

Fig 1: Code 74 Schematic Transmission Input Speed Error

G94D38383

Fig 2: Code 74 Schematic Flow Chart Transmission Input Speed Error

G94I66058