HYBRID CONTROL SYSTEM, Diagnostic DTC:P0C39-626 and P0C3C-625

DTC Code DTC Name
P0C39-626 DC / DC Converter Temperature Sensor "A" Range / Performance
P0C3C-625 DC / DC Converter Temperature Sensor "A" Intermittent / Erratic

DTC SUMMARY

  1. MALFUNCTION DESCRIPTION

    These DTCs indicate the boost converter temperature sensor (upper) value is abnormal. The cause of this malfunction may be one of the following:

    • Internal inverter malfunction

    • Inverter with converter assembly internal circuit malfunction

    • Hybrid cooling system malfunction

    • Coolant circulation abnormal (frozen or leaking, etc.)

    • Inverter low-voltage circuit malfunction

    • The connectors are not connected properly

DESCRIPTION

The MG ECU, which is built into in the inverter with converter assembly, detects the temperature of the boost converter using the temperature sensor built into the boost converter. If necessary, the MG ECU will limit inverter output to help prevent boost converter overheating. The hybrid vehicle control ECU also detects malfunctions in the sensor based on the temperature sensor values. The inverter with converter assembly detects malfunctions in the boost converter temperature sensor and its wiring.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Warning Indicate

P0C39-626

DC / DC Converter Temperature Sensor "A" Range / Performance

Boost converter temperature (upper) calculated by the hybrid vehicle control ECU is different from the actual temperature for 10 seconds or more, and the boost converter temperature (upper) is excessively high.

(1 trip detection logic)

  • Inverter cooling system

  • Cooling fan system

  • Inverter with converter assembly

  • Wire harness or connector

Comes on

Master Warning Light:

Comes on

P0C3C-625

DC / DC Converter Temperature Sensor "A" Intermittent / Erratic

Sudden change in boost converter temperature (upper) sensor output or hunting:

Either of the following conditions is met:

  1. Unusual sudden change in boost converter temperature sensor (upper) output occurs and the offset continues for a certain period of time.*

  2. Unusual sudden change in boost converter temperature sensor (upper) output occurs repeatedly.*

(1 trip detection logic)

  • Inverter cooling system

  • Cooling fan system

  • Inverter with converter assembly

  • Wire harness or connector

Comes on

Master Warning Light:

Comes on
Tip:

*: If only DTC P0C3C-625 is output, a temperature sensor malfunction is more likely to be the cause than a sudden change in actual temperature.

Table 1. Related Data List

DTC No.

ECU Data List

P0C39-626

  • DC/DC Cnv Temp (Upper)

  • DC/DC Cnv Temp (Lower)

P0C3C-625

CAUTION / NOTICE / HINT

CAUTION:

  • Before inspecting the high-voltage system or disconnecting the low voltage connector of the inverter with converter assembly, take safety precautions such as wearing insulated gloves and removing the service plug grip to prevent electrical shocks. After removing the service plug grip, put it in your pocket to prevent other technicians from accidentally reconnecting it while you are working on the high-voltage system.

  • After removing the service plug grip, wait for at least 10 minutes before touching any of the high-voltage connectors or terminals. After waiting for 10 minutes, check the voltage at the terminals in the inspection point in the inverter with converter assembly. The voltage should be 0 V before beginning work.

    Click here

    Tip:

    Waiting for at least 10 minutes is required to discharge the high-voltage capacitor inside the inverter with converter assembly.

Note:

After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work.

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Tip:

After the repair, clear the DTCs and perform the following procedure to check that DTCs are not output.

  1. Turn the power switch on (READY) and wait for 90 seconds or more.

  2. Drive the vehicle for approximately 10 minutes referring to the freeze frame data or Data List item: "Vehicle Spd".

PROCEDURE

  1. CHECK DTC OUTPUT (HYBRID CONTROL)

    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

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

    4. Check for DTCs.

      Powertrain > Hybrid Control > Trouble Codes

      Result

      Result

      Proceed to

      P0C39-626 or P0C3C-625 only is output, or DTCs except the ones in the table below are also output.

      A

      Any of the following DTCs are also output.

      B

      Relevant DTC

      P0A93-346

      Inverter Cooling System Performance

      P0C73-776

      Motor Electronics Coolant Pump "A" Control Performance

      P314A-828

      Inverter Coolant Pump Speed Signal
      Tip:

      P0C39-626 or P0C3C-625 may be output as a result of the malfunction indicated by the DTCs above.

    5. Turn the power switch off.

    B

    GO TO DTC CHART (HYBRID CONTROL SYSTEM)

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    A

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

    Click here

    Result

    Result

    Proceed to

    OK

    A

    NG (The connector is not connected securely.)

    B

    NG (The terminals are not making secure contact or are deformed, or water or foreign matter exists in the connector.)

    C
    B

    CONNECT SECURELY

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    A

  3. CHECK COOLING SYSTEM

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    Tip:

    If the "Cooling System" inspection results are normal, perform the next step.

    Result

    Proceed to

    NEXT
    NEXT

    REPLACE INVERTER WITH CONVERTER ASSEMBLY

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