Car Speed Sensor

Remove the speedometer assembly.
Connect the leads of a circuit tester across terminals 1 and 2 at rear face of the meter assembly. See Fig 2 .
Turn the inner shaft slowly and check that the tester indicates a continuity and open circuit condition alternately. If speed sensor is inoperative, replace speedometer assembly.

Fig 1: Code No. 63 Schematic, Vehicle Speed Sensor Signal

Courtesy of ISUZU MOTOR CO.

Fig 2: Code No. 63 Speed Sensor Check

Courtesy of ISUZU MOTOR CO.

Fig 3: Code No. 63 Flow Chart, Vehicle Speed Sensor Signal

Courtesy of ISUZU MOTOR CO.