Signal Circuit Inspection

Ignition "ON" & Engine "OFF" & ESC Switch "ON".
Measure voltage between terminal "31" of the HECU harness connector and chassis ground.
Specification: Approx B+

Fig 1: Measuring Voltage Between Terminal 31 Of HECU Harness Connector And Chassis Ground
Courtesy of HYUNDAI MOTOR CO.
Is the measured voltage within specifications?
YES
- Fault is intermittent caused by poor connection in ESC switch line or was repaired and HECU memory was not cleared. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.
NO
- Check for damaged harness and poor connection in the power harness between the battery terminal ( +) and the terminal "31" of the HECU harness connector. Check for open or blown 10A fuse referring to "Fig 1". Repair as necessary and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.