Vehicle Speed Sensor

With instrument cluster removed, use ohmmeter to check continuity across vehicle speed sensor (VSS) terminals. See Fig 1 .
Rotate speedometer shaft slowly and note if reading alternates from continuity to an open circuit 4 times per revolution. Replace speedometer assembly if VSS is defective.

Fig 1: Testing Vehicle Speed Sensor

Courtesy of ISUZU MOTOR CO.

NOTE: If a problem develops with vehicle speed sensor, ECM will set Code 24. For additional testing procedures, see appropriate G - EFI TESTS W/ CODES article in the ENGINE PERFORMANCE Section.