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Home >> GMC >> 1994 >> Jimmy 2D Utility, 4.3 Z, 4WD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - Electronic Transmission >> Trouble Code Charts >> Code 74, Trans. Input Speed Error >> Notes

Code 74, Trans. Input Speed Error: Notes

Sensor is a permanent magnet type. When rotating trigger teeth pass sensor, an AC voltage signal is produced. Signal voltage and frequency varies with forward rotational speed.

NOTE: Test numbers refer to numbers on diagnostic chart.
  1. Checks entire circuit for continuity.
  2. Checks output of the input speed sensor.
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