Diagnostic Aids

With drive wheels turning, scan tester and speedometer reading should closely match.

Fig 1: CODE 24, Schematic, Vehicle Speed Sensor Circuit

Courtesy of GENERAL MOTORS CORP.

Fig 2: CODE 24, Schematic, Vehicle Speed Sensor Circuit

Courtesy of GENERAL MOTORS CORP.

Fig 3: CODE 24, Flow Chart, Vehicle Speed Sensor Circuit

Courtesy of GENERAL MOTORS CORP.