Vehicle Speed Sensor

On 1990-1992 models, the vehicle speed sensor is mounted on a bracket located on the left hand chassis side member adjacent to the rear engine mounting. On 1993-Early 1995 models, the vehicle speed sensor is located on side of the transfer box adjacent to the parking brake. The sensor provides road speed data to the ECM. The ECM in turn detects vehicle movement from the road speed input and ensures that idle air control mode is disengaged. Should the vehicle speed sensor fail in service the ECM idle air control would become erratic. The sensor also provides road speed data to the electric speedometer and, when fitted, air suspension Electronic Control Unit (ECU).