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Home >> Chevrolet >> 1992 >> Lumina L4-151 2.5L >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Vehicle Speed Sensor >> Testing and Inspection >> Symptom Related Diagnostic Procedures
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Symptom Related Diagnostic Procedures

Connect a Scan Tool to the ALDL Connector. Drive the vehicle. Observe the Speedometer and Scan Tool speed display.
^ If the Speedometer and Scan Tool agree, check the ECM MEM-CAL, the Vehicle Speed Sensor, and for the correct tire size.
^ If the Speedometer and Scan Tool disagree, service the Instrument Cluster.
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