HYBRID CONTROL SYSTEM, Diagnostic DTC:P0BCD-315, P0BD0-314

DESCRIPTION

The MG ECU located in the inverter with converter assembly detects the temperature of the generator inverter using the temperature sensor built into the generator inverter. If necessary, the MG ECU will limit inverter output to help prevent generator inverter overheating. The power management control ECU (HV CPU) also detects malfunctions in the sensor based on the temperature sensor values. The inverter with converter assembly detects malfunctions in the generator inverter temperature sensor and its wiring.

INSPECTION PROCEDURE

PROCEDURE

1. CHECK DTC OUTPUT (HV)

   
   

   1. Connect the intelligent tester to the DLC3.

   2. Turn the power switch on (IG).

   3. Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.

   4. Check if DTCs are output.

      Result
      Result Proceed to P0BCD-315 or P0BD0-314 is output A Any of the following DTCs are also output. B

      DTC No.	Relevant Diagnosis
      P0A93-346	Inverter Cooling System Performance
      P0C73-776	Motor Electronics Coolant Pump "A" Control Performance
      P314A-828	Inverter Coolant Pump Speed Signal

      Tech Tips

      P0BCD-315 or P0BD0-314 may be set due to a malfunction which also causes DTCs in the preceding table to be set. In this case, first troubleshoot the output DTCs in the preceding table. Then, perform a test to attempt to reproduce the problems, and check that no DTCs are output.

   5. Turn the power switch off.

   
   

   B

   GO TO DTC CHART Click here

   A

2. CHECK CONNECTOR CONNECTION CONDITION (INVERTER WITH CONVERTER ASSEMBLY CONNECTOR)

   CAUTION:

   Be sure to wear insulated gloves.

   
   

   1. Check that the service plug grip is not installed.

      Note

      After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the repair manual because this may cause a malfunction.

      Note

      Before disconnecting the connector, confirm that it is properly connected by checking that the locking claws are engaged and that the connector does not pull out.

      

   2. Check the connection of the low voltage connector of the inverter with converter assembly.

      OK
      The connector is connected securely and there are no contact problems.

      Tech Tips

      When connecting the connector, insert it with the locking lever in the raised position. Rotate the lever downward and make sure that the connector is pulled into its socket. When the locking lever is in its fully closed position, a click will be heard as its locking claws engage. After the click is heard, pull up on the connector to confirm that it is properly connected.

   
   

   NG

   CONNECT SECURELY

   OK

3. CHECK QUANTITY OF HV COOLANT

   
   

   1. Check the coolant level in the inverter reserve tank.

   2. Check for coolant leaks.

      Result

      Result	Proceed to
      Coolant leaks are not evident. A sufficient amount of coolant remains in the inverter reserve tank.	A
      Coolant leaks are not evident. No coolant remains in the inverter reserve tank.	B
      Coolant leaks are evident.	C

      Tech Tips

      After repairing the coolant leaks and adding coolant, perform the "Activate the Water Pump" Active Test (HV Active Test item) and the "Control the Electric Cooling Fan" Active Test (Engine Active Test item) and make sure that there are no malfunctions.

   
   

   B

   ADD HV COOLANT

   C

   INSPECT FOR COOLANT LEAKS AND ADD COOLANT

   A

4. CHECK COOLANT HOSE

   
   

   1. Check if the hoses of the cooling system are kinked or clogged.

   
   

   NG

   CORRECT THE PROBLEM

   OK

5. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (CONTROL THE ELECTRIC COOLING FAN)

   
   

   1. Connect the intelligent tester to the DLC3.

   2. Turn the power switch on (IG).

   3. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Electric Cooling Fan.

   4. Perform the "Control the Electric Cooling Fan" Active Test.

      OK
      The cooling fan rotates.

   5. Turn the power switch off.

   
   

   NG

   CHECK COOLING FAN SYSTEM Click here

   OK

6. CHECK HV COOLANT (CHECK FOR CONDITIONS THAT MAY HAVE CAUSED FREEZING)

   
   

   1. Connect the intelligent tester to the DLC3.

   2. Turn the power switch on (IG).

   3. Read the freeze frame data Ambient Temperature using the intelligent tester.

   4. Check if the freeze frame data Ambient Temperature is below freezing.

      Result
      Result Proceed to Ambient Temperature value is below freezing temperature of the HV coolant A Ambient Temperature value is above freezing temperature of the HV coolant B

      Tech Tips

      
      

      • HV coolant (SLLC) with a 30% concentration freezes at -15 °C (5°F) and HV coolant (SLLC) with a 50% concentration freezes at -35°C (-31°F).

      • If the HV coolant freezes in the HV radiator or inverter water pump assembly, the coolant temperature in the inverter with converter assembly rises because the HV coolant cannot circulate. As a result, a DTC may be set.

      • A DTC is set when the inverter water pump assembly impeller cannot rotate due to freezing of the HV coolant.

      • If a DTC is set due to freezing of HV coolant, the problem cannot be reproduced. Judge whether freezing of HV coolant occurred according to the freeze point of the HV coolant, HV coolant change history and ambient temperature when the DTC was set.

   5. Turn the power switch off.

   
   

   B

   REPLACE INVERTER WITH CONVERTER ASSEMBLY Click here

   A

7. REPLACE HV COOLANT

   
   

   1. Replace the HV coolant with coolant having an appropriate concentration (appropriate freeze point) for the vehicle usage conditions Click here.

   
   

   NEXT

8. CHECK INVERTER WATER PUMP ASSEMBLY

   
   

   1. Perform a road test and check that DTCs are not stored.

      OK
      DTCs are not stored.

   
   

   NG

   REPLACE INVERTER WATER PUMP ASSEMBLY Click here

   OK

   COMPLETED