Cavalier/Z24 L4-138 2.3L DOHC VIN D MFI (1995)
Vehicle Speed Sensor: Component Tests and General Diagnostics
Circuit Operation
The Vehicle Speed Sensor is a gear-driven Permanent Magnet Generator housed in the vehicles transaxle. This sensor generates a sine wave output with
a frequency proportional to vehicle speed. The Powertrain Control Module (PCM) converts this signal to an output that is switched to ground at a
frequency of 4000 pulses per mile at the DK GRN/WHT (817 CKT) wire output. This output varies from 16 volts to battery voltage.
System Diagnosis
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If any Powertrain Control Module (PCM) Diagnostic Trouble Codes are set.
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Check for a broken (or partially broken) wire inside of the insulation which could cause system failure but prove "GOOD" in a continuity/voltage
check (refer to "General Troubleshooting Procedures"). See: Diagrams/Diagnostic Aids
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Check for proper installation of aftermarket electronic equipment which may effect the integrity of other systems (refer to "General
Troubleshooting Procedures").
