Ground Circuit Inspection

The purpose of checking terminal 2 after disconnecting VSS connector is to check open or short circuit of ground.

1. Ignition "OFF"
2. Disconnect VSS sensor connector.
3. Ignition "ON" & Engine "OFF"
4. Measure voltage or resistance between terminal 1 of sensor harness connector and chassis ground.

   Specification: below 0.5V or below 1Ω

   Fig 1: Measuring Resistance Between Terminal 1 Of Sensor Harness Connector And Chassis Ground

   Courtesy of HYUNDAI MOTOR CO.
5. Is measure voltage or resistance within Specification?

   YES 

   • Go to "COMPONENT INSPECTION " procedure.

   NO 

   • Open circuit between VSS harness connector and Chassis ground.
   • Repair as necessary and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.

1. Check PCM

   The purpose of checking ECM is to determine whether there is any malfunction of PCM

   1. Ignition "OFF"
   2. Connect scan tool and Engine "ON "
   3. Select simulation function on scan tool.

      Specification: If the vehicle speed changes as simulation change, it is OK

      Fig 2: Scan Tool Display Vehicle Speed Simulation

      Courtesy of HYUNDAI MOTOR CO.
   4. Is VSS sensor signal value changed according to simulation voltage ?

      YES 

      • Check VSS for contamination, deterioration, or damage. Clean VSS with suitable cleaner as necessary and let air dry before reinstalling. If problem still exists, Substitute with a known-good VSS and check for proper operation.

        If the problem is corrected, replace VSS and then go to "VERIFICATION OF VEHICLE REPAIR " procedure

      NO 

      • Substitute with a known-good PCM and check for proper operation. If the problem is corrected, replace PCM and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.