ECM Problem Inspection Procedure

1. TEST ECM GROUND CIRCUIT: Measure resistance between ECM and chassis ground using the backside of ECM harness connector as ECM side check point. If the problem is found, repair it.

   Specification:  Below 1 Ω

2. TEST ECM CONNECTOR: Disconnect the ECM connector and visually check the ground terminals on ECM side and harness side for bent pins or poor contact pressure. If the problem is found, repair it.
3. If problem is not found in Step  1 and 2, the ECM could be faulty. If so, replace the ECM with a new one, and then check the vehicle again. If the vehicle operates normally then the problem was likely with the ECM.
4. RE-TEST THE ORIGINAL ECM: Install the original ECM (may be broken) into a known-good vehicle and check the vehicle. If the problem occurs again, replace the original ECM with a new one. If problem does not occur, this is intermittent problem (Refer to BASIC INSPECTION PROCEDURE ).

VIN Programming Procedure 

VIN (Vehicle Identification Number) is a number that has the vehicle's information (Maker, Vehicle Type, Vehicle Line/Series, Body Type, Engine Type, Transmission Type, Model Year, Plant Location and so forth. For more information, please refer to "VEHICLE IDENTIFICATION NUMBER " ). When replacing an ECM, the VIN must be programmed in the ECM. If there is no VIN in ECM memory, the fault code (DTC P0630) is set.

1. Select "VIN Writing" function in "Vehicle S/W Management".
2. Select "Write VIN" in "ID Register".
   Fig 1: Screen Display - Write VIN In ID Register

   Courtesy of HYUNDAI MOTOR AMERICA
3. Input the VIN.
   WARNING: Before inputing the VIN, confirm the VIN again because the programmed VIN cannot be changed.
   Fig 2: Screen Display - Write VIN

   Courtesy of HYUNDAI MOTOR AMERICA
4. Turn the ignition switch OFF, then back ON.