Cavalier/Z24 V6-191 3.1L VIN T MFI (1994)
Test C: Speed Out Put Test
Speed Signal Test
The Vehicle Speed Sensor is a gear-driven Permanent Magnet Generator housed in the vehicle's transaxle. This sensor generates a sine wave output with
a frequency proportional to vehicle speed. The Engine Control Module (ECM) converts this signal to an output that is switched to ground at a frequency
of 4000 pulses per mile at the DK GRN (389) wire output. This output is pulled up to 5 volts or greater by the components that use these speed signals
as input.
System Diagnosis
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If referred here from Cruise Control, do Test B. See: Diagnostic Tests/Test B: Speed Signal Test
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Refer to Symptom Table for listed symptoms and refer Diagnostic Tests for Diagnostic procedures. See: Symptom Related Diagnostic
Procedures See: Diagnostic Tests