Monitor DTC Status
- Ignition ON (SSB LED "BLUE") & Vehicle "STOP".
- Connect GDS and select "DTC Analysis" mode.
- Click "DTC Status" on the menu bar to view DTC information.
- Confirm that the "DTC Readiness Flag" indicates "COMPLETED". If not, drive the vehicle within conditions noted in Freeze Frame Data or Enable Conditions.
- Read the "DTC Status" parameter.
- Is parameter displayed "Present fault"?
YES
- In case that only the LDC temperature is high, after diagnosing the MCU system, check DTCs related LDC temperature sensors and Sensor operation. And, if the MCU temperature is high together, check whether operation of Cooling system is good or not.
- If there is not any DTC related temperature sensors and the cooling system is also normal, Substitute with a known-good HPCU(LDC) and check for proper operation. If the problem is corrected, replace HPCU(LDC) and then go to "Verification of Vehicle Repair " procedure.
NO
- If it is history code, Fault is intermittent caused by poor contact in the sensor's and/or Control module's connector or was repaired and Control module's memory was not cleared. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and go to "Verification of Vehicle Repair " procedure.
CAUTION: Perform following items when HPCU is replaced or reassembled.
Carry out "HCU/LDC" system → "Optional function" → "Engine clutch/motor resolver learning".
Refill the coolant and circulate the coolant by carrying out "Actuation" → "Electronic Water Pump (EWP)".
Non-compliance with the following instructions can induce death or injury caused by electric shock.
Carefully read and follow service information instructions.
Wear insulated gloves, safety glasses and use insulated tools for your safety.
Turn the ignition switch off and Disconnect ground cable of auxiliary battery and Remove the safety plug.
Wait for more than 5 minutes so that the inverter capacitor can be naturally discharged.
Check high voltage terminal on Power Relay Assembly is lower than 30V.
Perform Resolver adaptation after the HPCU or the Driver Motor or the Generator (HSG) is replaced or reinstalled.
When replaced HPCU, Perform air bleeding for HPCU with GDS.