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Home >> Toyota >> 2021 >> Mirai Limited >> Repair and Diagnosis >> Hybrid/Electric Powertrain >> Testing and Diagnosis >> Hybrid Battery System - Diagnostic Codes (2 Of 8) >> Hybrid Battery System >> DTC P0A81-96: Hybrid/EV Battery Cooling Fan 1 Component Internal Failure; DTC P0A81-98: Hybrid/EV Battery Cooling Fan 1 Component or System Over Temperature [11/2020 - 12/2022] >> Procedure

DTC P0A81-96: Hybrid/EV Battery Cooling Fan 1 Component Internal Failure; DTC P0A81-98: Hybrid/EV Battery Cooling Fan 1 Component or System Over Temperature [11/2020 - 12/2022]: Procedure

  1. CHECK DTC OUTPUT (EV BATTERY, EV) 

    Pre-procedure1

    • None.
    • Check for DTCs.

      Powertrain > EV Battery > Trouble Codes 

      Powertrain > EV > Trouble Codes 

      Result

      Result Proceed to
      Only P0A81-96 or P0A81-98 for Hybrid battery system is output A
      P0A81-96 or P0A81-98 is output and DTCs other than the DTCs in the table below are output B
      P0A81-96 or P0A81-98 is output and Hybrid battery system DTCs in the table below are output C
      P0A81-96 or P0A81-98 is output and Hybrid control system DTCs in the table below are output D
      System Relevant DTC
      Hybrid battery system P060A-47 Hybrid/EV Battery Energy Control Module Monitoring Processor Watchdog / Safety MCU Failure
      P060B-49 Hybrid/EV Battery Energy Control Module A/D Processing Internal Electronic Failure
      P0606-87 Hybrid/EV Battery Energy Control Module Processor to Monitoring Processor Missing Message
      Hybrid control system P0A1F-94 Hybrid/EV Battery Energy Control Module Unexpected Operation

    Post-procedure1

    • Turn the ignition switch off.

    Result: 

    B 

    See step  2

    Result: 

    C 

    GO TO DTC CHART (HYBRID BATTERY SYSTEM). Refer to  DIAGNOSTIC TROUBLE CODE CHART [11/2020 - 12/2022] 

    Result: 

    D 

    GO TO DTC CHART (HYBRID CONTROL SYSTEM). Refer to  DIAGNOSTIC TROUBLE CODE CHART [11/2020 - 12/2022] 

    Result: 

    A 

    See step  2

  2. CHECK DUCT AND BLOWER 
    WARNING:

    Be sure to wear insulated gloves.

    Pre-procedure1

    • Check that the service plug grip and FC converter power outlet cable are not installed.
      NOTE:

      After removing the service plug grip and FC converter power outlet cable, do not turn the ignition switch to ON (READY), unless instructed by the appropriate service information because this may cause a malfunction.

    • Remove the rear seat assembly.

      HINT: 

      Refer to REMOVAL [11/2020 - ]

    • Check that the No. 1 EV battery intake filter, No. 2 EV battery intake filter, No. 2 EV battery intake duct, No. 4 EV battery intake duct, No. 5 EV battery intake duct and battery cooling blower assembly are not disconnected, damaged, or clogged with foreign matter.
      GTY1002964Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 1 EV Battery Intake Filter *2 No. 2 EV Battery Intake Filter
      *3 Battery Cooling Blower Assembly *4 No. 2 EV Battery Intake Duct
      *5 No. 4 EV Battery Intake Duct *6 No. 5 EV Battery Intake Duct

      OK

      The No. 1 EV battery intake filter, No. 2 EV battery intake filter, No. 2 EV battery intake duct, No. 4 EV battery intake duct, No. 5 EV battery intake duct and battery cooling blower assembly are not disconnected, damaged, or clogged with foreign matter.

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • Install the rear seat assembly.

    Result: 

    NG 

    CORRECT THE PROBLEM 

    Result: 

    OK 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (NO. 2 EV BATTERY PACK WIRE CONNECTOR - BATTERY COOLING BLOWER ASSEMBLY) 

    Refer to PROCEDURE - Step 3

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  4

  4. CHECK HARNESS AND CONNECTOR (NO. 2 EV BATTERY PACK WIRE CONNECTOR - BATTERY COOLING BLOWER ASSEMBLY) 

    Refer to PROCEDURE - Step 11

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  5

  5. READ VALUE USING GTS (HYBRID/EV BATTERY COOLING FAN 1 FREQUENCY) 

    Refer to PROCEDURE - Step 4

    Result

    Result Proceed to
    Both of the value in the Data List (Hybrid/EV Battery Cooling Fan 1 Frequency) and the actual measured value at the battery ECU assembly connector are 0 Hz. A
    Other than above B

    Result: 

    B 

    See step  9

    Result: 

    A 

    See step  6

  6. CHECK BATTERY ECU ASSEMBLY 

    Refer to PROCEDURE - Step 5

    Result

    Proceed to
    OK
    NG

    Result: 

    OK 

    REPLACE BATTERY COOLING BLOWER ASSEMBLY. Refer to  REMOVAL [11/2020 - 11/2021]  , or refer to  REMOVAL [11/2021 - 12/2022] 

    Result: 

    NG 

    See step  7

  7. CHECK BATTERY ECU ASSEMBLY (GROUND SHORT CHECK) 

    Refer to PROCEDURE - Step 15

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPLACE BATTERY ECU ASSEMBLY. Refer to  REMOVAL [11/2020 - 11/2021]  , or refer to  REMOVAL [11/2021 - 12/2022] 

    Result: 

    OK 

    See step  8

  8. CHECK HARNESS AND CONNECTOR (BATTERY ECU ASSEMBLY - NO. 2 EV BATTERY PACK WIRE CONNECTOR) 

    Refer to PROCEDURE - Step 6

    Result

    Proceed to
    OK
    NG

    Result: 

    OK 

    REPLACE BATTERY ECU ASSEMBLY. Refer to  REMOVAL [11/2020 - 11/2021]  , or refer to  REMOVAL [11/2021 - 12/2022] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  9. CHECK BATTERY ECU ASSEMBLY (HYBRID/EV BATTERY COOLING FAN 1 FREQUENCY) 

    Refer to PROCEDURE - Step 7

    Result

    Proceed to
    OK
    NG

    Result: 

    OK 

    REPLACE BATTERY COOLING BLOWER ASSEMBLY. Refer to  REMOVAL [11/2020 - 11/2021]  , or refer to  REMOVAL [11/2021 - 12/2022] 

    Result: 

    NG 

    See step  10

  10. CHECK BATTERY ECU ASSEMBLY (GROUND SHORT CHECK) 

    Refer to PROCEDURE - Step 15

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPLACE BATTERY ECU ASSEMBLY. Refer to  REMOVAL [11/2020 - 11/2021]  , or refer to  REMOVAL [11/2021 - 12/2022] 

    Result: 

    OK 

    See step  11

  11. CHECK HARNESS AND CONNECTOR (BATTERY ECU ASSEMBLY - NO. 2 EV BATTERY PACK WIRE CONNECTOR) 

    Refer to PROCEDURE - Step 8

    Result

    Proceed to
    OK
    NG

    Result: 

    OK 

    REPLACE BATTERY ECU ASSEMBLY. Refer to  REMOVAL [11/2020 - 11/2021]  , or refer to  REMOVAL [11/2021 - 12/2022] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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