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Home >> Lexus >> 2019 >> ES 350 Luxury >> Repair and Diagnosis >> External Pages >> Different car >> Section 139 (Hybrid Battery System (For Lithium-Ion Battery) - Diagnostic Codes (1 Of 3)) >> HYBRID BATTERY SYSTEM (for LITHIUM-ION BATTERY) >> DTC P0A81-96: Hybrid/EV Battery Cooling Fan 1 Component Internal Failure [08/2020 - ] >> Procedure

DTC P0A81-96: Hybrid/EV Battery Cooling Fan 1 Component Internal Failure [08/2020 - ]: Procedure

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  1. CHECK DTC OUTPUT (HV BATTERY, HYBRID CONTROL) 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Enter the following menus: Powertrain / HV Battery and Hybrid Control / Trouble Codes.
    4. Check for DTCs.

      Powertrain > HV Battery > Trouble Codes 

      Powertrain > Hybrid Control > Trouble Codes 

      Result

      Result Proceed to
      P0A81-96 only is output, or DTCs except the ones in the table below are also output. A
      DTCs of hybrid battery system in the table below are output. B
      DTCs of hybrid control system in the table below are output. C
      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
    5. Turn the power switch off.

    Result: 

    B 

    GO TO DTC CHART (HYBRID BATTERY SYSTEM). Refer to  DIAGNOSTIC TROUBLE CODE CHART [08/2020 - ] 

    Result: 

    C 

    GO TO DTC CHART (HYBRID CONTROL SYSTEM). Refer to  DIAGNOSTIC TROUBLE CODE CHART [08/2020 - 08/2021]  , or refer to  DIAGNOSTIC TROUBLE CODE CHART [08/2021 - ] 

    Result: 

    A 

    See step  2

  2. CHECK DUCT AND BLOWER 
    WARNING:

    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 appropriate service information because this may cause a malfunction.

    2. Remove the rear seat cushion leg sub-assembly.

      Refer to PROCEDURE - Step 8

    3. Check that the No. 1 HV battery intake filter, battery cooling blower assembly and No. 1 hybrid battery intake duct are not disconnected, damaged, or clogged with foreign matter.
      GTY946861Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 1 HV Battery Intake Filter *2 Battery Cooling Blower Assembly
      *3 No. 1 Hybrid Battery Intake Duct *4 No. 1 Hybrid Battery Intake Duct LH

      OK

      The No. 1 HV battery intake filter, No. 1 hybrid battery intake duct, No. 1 hybrid battery intake duct LH and battery cooling blower assembly blower are not disconnected, damaged, or clogged with foreign matter.

    4. Install the rear seat cushion leg sub-assembly.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    CORRECT THE PROBLEM 

    Result: 

    OK 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (BATTERY ECU ASSEMBLY - BATTERY COOLING BLOWER ASSEMBLY) 

    See 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 (BATTERY ECU ASSEMBLY - BATTERY COOLING BLOWER ASSEMBLY) 

    See step  9

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  5

  5. CHECK BATTERY ECU ASSEMBLY (GROUND SHORT CHECK) 
    1. Remove the battery ECU assembly.

      Refer to REMOVAL [08/2020 - 08/2021] , or refer to REMOVAL [08/2021 - 09/2022] , or refer to REMOVAL [09/2022 - ]

    2. Measure the resistance according to the value(s) in the table below.
      GTY946875Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Battery ECU Assembly)      		 - -

      Standard Resistance

      Tester Connection Condition Specified Condition
      y16-14 (SI0) -y16-27 (GND) Power switch off 10 kΩ or higher
      y16-14 (SI0) -y16-3 (GND1) Power switch off 10 kΩ or higher
    3. Install the battery ECU assembly.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE BATTERY ECU ASSEMBLY. Refer to  REMOVAL [08/2020 - 08/2021]  , or refer to  REMOVAL [08/2021 - 09/2022]  , or refer to  REMOVAL [09/2022 - ] 

    Result: 

    OK 

    See step  6

  6. READ VALUE USING TECHSTREAM (HYBRID/EV BATTERY COOLING FAN 1 FREQUENCY) 

    See 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  8

    Result: 

    A 

    See step  7

  7. CHECK BATTERY ECU ASSEMBLY 

    See step  5

    Result

    Proceed to
    OK
    NG

    Result: 

    OK 

    REPLACE BATTERY COOLING BLOWER ASSEMBLY. Refer to  REMOVAL [06/2018 - ] 

    Result: 

    NG 

    REPLACE BATTERY ECU ASSEMBLY. Refer to  REMOVAL [08/2020 - 08/2021]  , or refer to  REMOVAL [08/2021 - 09/2022]  , or refer to  REMOVAL [09/2022 - ] 

  8. CHECK BATTERY ECU ASSEMBLY (FREQUENCY) 

    See step  6

    Result

    Proceed to
    OK
    NG

    Result: 

    OK 

    REPLACE BATTERY COOLING BLOWER ASSEMBLY. Refer to  REMOVAL [06/2018 - ] 

    Result: 

    NG 

    REPLACE BATTERY ECU ASSEMBLY. Refer to  REMOVAL [08/2020 - 08/2021]  , or refer to  REMOVAL [08/2021 - 09/2022]  , or refer to  REMOVAL [09/2022 - ] 

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