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Home >> GMC >> 1993 >> Value Van 4.3 Z, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - V8 >> Summary >> Code 16, Transmission Output Speed - 5.0L & 5.7L With 4L60E Transmission >> Notes
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Code 16, Transmission Output Speed - 5.0L & 5.7L With 4L60E Transmission: Notes

VSS signal buffer supplies 2002 pulses per mile to PCM on vehicle speed signal circuit. Code 16 will set if this signal is lost due to an open or grounded signal line.

NOTE: Test numbers refer to test numbers on diagnostic chart.
  1. This tests for battery voltage at VSS buffer.
  2. This tests for proper ground path for VSS buffer.
  3. This tests for VSS buffer signal to PCM.
  4. This test checks for faulty connections and a faulty VSS buffer.
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