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Home >> GMC >> 1995 >> Forward Control 4.3 Z, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - 6.5L Diesel. >> Diagnostic Trouble Code Charts >> DTC 74, Transmission Input Speed Sensor Circuit (4L80-E) >> Diagnostic Aids

Diagnostic Aids

Check for poor connections in PCM related circuits.

Fig 1: DTC 74 Schematic (4L80-E) Transmission Input Speed Sensor Circuit
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Fig 2: DTC 74 Flow Chart (4L80-E) Transmission Input Speed Sensor Circuit
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