HYBRID CONTROL SYSTEM, Diagnostic DTC:P0A94-553

DTC Code DTC Name
P0A94-553 DC / DC Converter Performance

DTC SUMMARY


  1. MALFUNCTION DESCRIPTION

    This DTC indicates when the temperature of the boost converter has become abnormal. The cause of this malfunction may be one of the following:

    Area Main Malfunction Description Step
    Inverter low-voltage circuit The connectors are not connected properly 2
    Hybrid cooling system Coolant is leaking, insufficient coolant level, frozen or the passenger of coolant is clogged. 3
    Resolver Open or short circuit in the motor resolver, generator resolver or rear motor resolver* 4, 5, 6
    Motor, generator or rear motor*

    • Open or short circuit in the motor, generator or rear motor* coils

    • An internal motor, generator or rear motor* malfunction (iron particles or damage from foreign objects)

    		 7, 8, 9
    Inverter

    • Internal circuit malfunction in the inverter for the motor

    • Malfunction in ECU that controls the inverter

    • Malfunction in the sensors for inverter control (current sensor, voltage sensors (VH, VL), etc.)

    		 10

DESCRIPTION

For a description of the boost converter.

Click here

If a malfunction occurs in the boost converter, the MG ECU detects it and transmits this information to the hybrid vehicle control ECU.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Warning Indicate
P0A94-553 DC / DC Converter Performance

Boost converter fail signal detected (overheat):

Overheating or an internal short circuit of the boost converter is detected.

(1 trip detection logic)

  • Wire harness or connector

  • Inverter cooling system

  • Hybrid vehicle transaxle assembly

  • Inverter with converter assembly

  • Cooling fan circuit

  • PCU fuse

  • Hybrid vehicle control ECU

  • Rear traction motor with transaxle assembly (for AWD)

  • Extension wire assembly (for AWD)

  • No. 2 frame wire (for AWD)

 Comes on

Master Warning Light:

Comes on
Related Data List
DTC No. Data List
P0A94-553

  • DC/DC Cnv Temp (Upper)

  • DC/DC Cnv Temp (Lower)

WIRING DIAGRAM

Refer to the wiring diagram for DTC P0A1A-200.

Click here

Refer to the wiring diagram for DTC P0AA6-526.

Click here

Refer to the wiring diagram for DTC P324E-788.

Click here

Refer to the wiring diagram for the inverter low-voltage circuit.

Click here

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

    Tech Tips

    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.

    Click here

  • After troubleshooting and repairing all output DTCs, be sure to replace the inverter with converter assembly. (The inverter with converter assembly may have been broken or damaged due to overheating.)

Tech Tips

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 5 seconds or more.

  2. With the engine stopped and the shift lever in P, depress the accelerator pedal to start the engine.

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
      P0A94-553 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
      Malfunction Content Relevant DTC
      Microcomputer malfunction P0A1A (all INF codes)*1 Generator Control Module
      P0A1B-168, 192, 193, 198, 661, 786, 794, 795, 796 Drive Motor "A" Control Module
      P0A1C (all INF codes)*1 Drive Motor "B" Control Module
      P0A1D (all INF codes)*1 Hybrid Powertrain Control Module
      Power source circuit malfunction P0A1B-163, 164, 511, 512 Drive Motor "A" Control Module
      Sensor and actuator circuit malfunction P0A3F-243 Drive Motor "A" Position Sensor Circuit
      P0A40-500 Drive Motor "A" Position Sensor Circuit Range / Performance
      P0A41-245 Drive Motor "A" Position Sensor Circuit Low
      P0A45-669 Drive Motor "B" Position Sensor Circuit
      P0A46-671 Drive Motor "B" Position Sensor Circuit Range / Performance
      P0A47-670 Drive Motor "B" Position Sensor Circuit Low
      P0A4B-253 Generator Position Sensor Circuit
      P0A4C-513 Generator Position Sensor Circuit Range / Performance
      P0A4D-255 Generator Position Sensor Circuit Low
      P0A60 (all INF codes)*1 Drive Motor "A" Phase V Current
      P0A63 (all INF codes)*1 Drive Motor "A" Phase W Current
      P0A69 (all INF codes)*1 Drive Motor "B" Phase V Current
      P0A6C (all INF codes)*1 Drive Motor "B" Phase W Current
      P0A72 (all INF codes)*1 Generator Phase V Current
      P0A75 (all INF codes)*1 Generator Phase W Current
      P0C73-776 Motor Electronics Coolant Pump "A" Control Performance
      P314A-828 Inverter Coolant Pump Speed Signal
      System malfunction P0A78-113, 118, 119, 120, 128, 266, 267, 279, 284, 286, 287, 306, 503, 504, 505, 506, 586, 806, 807, 808 Drive Motor "A" Inverter Performance
      P0A79-136, 692, 693, 694, 695, 696, 704, 712, 812, 813, 814 Drive Motor "B" Inverter Performance
      P0A7A-122, 130, 322, 324, 325, 344, 517, 518, 809, 810, 811 Generator Inverter Performance
      P0A90-509 Drive Motor "A" Performance
      P0A91-702 Drive Motor "B" Performance
      P0A92-521 Hybrid Generator Performance
      P0A94-124, 125, 126, 169, 170, 171, 442, 547, 548, 549, 554, 555, 556, 585, 587, 589, 590 DC / DC Converter Performance
      P0C76-523 Hybrid Battery System Discharge Time Too Long

      Tech Tips


      • *1: If any INF codes are output for this DTC, refer to the corresponding diagnostic procedure.

      • P0A94-553 may be output as a result of the malfunction indicated by the DTCs above.


        1. The chart above is listed in inspection order of priority.

        2. Check DTCs that are output at the same time by following the listed order. (The main cause of the malfunction can be determined without performing unnecessary inspections.)

    5. Turn the power switch off.


    B

    GO TO DTC CHART (HYBRID CONTROL SYSTEM) Click here

    A

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

    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

    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.

    2. B002I4J

      Check the connection condition of the low voltage connector of the inverter with converter assembly and the contact pressure of each terminal. Check the terminals for deformation, and check the connector for water ingress and foreign matter.

      Click here

      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.

      OK
      - The connector is connected securely.
      - The terminals are not deformed and are connected securely.
      - No water or foreign matter in the connector.
      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

      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.


    B

    CONNECT SECURELY

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    A

  3. CHECK COOLING SYSTEM

    Click here

    Result
    Proceed to
    NEXT

    NEXT

  4. CHECK GENERATOR RESOLVER CIRCUIT

    Click here

    Result
    Proceed to
    NEXT

    NEXT

  5. CHECK MOTOR RESOLVER CIRCUIT

    Click here

    Result
    Proceed to
    NEXT (for AWD)
    NEXT (for 2WD)

    NEXT (for 2WD)

    GO TO STEP 7 Click here

    NEXT (for AWD)

  6. CHECK REAR MOTOR RESOLVER CIRCUIT

    Click here

    Result
    Proceed to
    NEXT

    NEXT

  7. CHECK GENERATOR HIGH-VOLTAGE CIRCUIT

    Click here

    Result
    Proceed to
    NEXT

    NEXT

  8. CHECK MOTOR HIGH-VOLTAGE CIRCUIT

    Click here

    Result
    Proceed to
    NEXT (for AWD)
    NEXT (for 2WD)

    NEXT (for 2WD)

    GO TO STEP 10 Click here

    NEXT (for AWD)

  9. CHECK REAR MOTOR HIGH-VOLTAGE CIRCUIT

    Click here

    Result
    Proceed to
    NEXT

    NEXT

  10. CHECK INVERTER LOW-VOLTAGE CIRCUIT

    Click here

    Tech Tips

    If the "Inverter Low-voltage Circuit" inspection results are normal, perform the next step.

    Result
    Proceed to
    NEXT

    NEXT

    REPLACE INVERTER WITH CONVERTER ASSEMBLY Click here