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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 110 (Hybrid Control System (2WD) - Diagnostic Codes (5 Of 7)) >> HYBRID CONTROL SYSTEM (for 2WD) >> DTC P1AC0-00: Hybrid/EV Battery Cell Low Voltage [12/2019 - 11/2023] >> Procedure

DTC P1AC0-00: Hybrid/EV Battery Cell Low Voltage [12/2019 - 11/2023]: Procedure

WARNING: This page is about a different variant/trim than selected.
  1. CHECK DTC OUTPUT (HYBRID CONTROL) 
    1. Check for DTCs.

      Powertrain > Hybrid Control > Trouble Codes 

      Result

      Result Proceed to
      P0AFC-00, P0AFC-96, P308A-12 or P0AFC-62 is not output. A
      P0AFC-00, P0AFC-96, P308A-12 or P0AFC-62 is also output. B
    2. Turn the ignition switch off.

    Result: 

    B 

    GO TO DTC CHART (HYBRID CONTROL SYSTEM) 

    Refer to DIAGNOSTIC TROUBLE CODE CHART [12/2019 - 09/2020] , or refer to DIAGNOSTIC TROUBLE CODE CHART [09/2020 - 10/2021] , or refer to DIAGNOSTIC TROUBLE CODE CHART [10/2021 - 11/2023]

    Result: 

    A 

    See step  2

  2. CHECK FREEZE FRAME DATA (HYBRID CONTROL) 
    1. Read output DTCs.

      Powertrain > Hybrid Control > Trouble Codes 

    2. Using the GTS, make a note of the Freeze Frame Data item "Hybrid Battery Block 3 to 10 Voltage".
    3. Compare the Freeze Frame Data item "Hybrid Battery Block 3 to 10 Voltage" values with those shown in the following combination table.
      Condition
      "Hybrid Battery Block 3 Voltage" - "Hybrid Battery Block 4 Voltage" = 1.2 V or more
      "Hybrid Battery Block 4 Voltage" - "Hybrid Battery Block 3 Voltage" = 1.2 V or more
      "Hybrid Battery Block 4 Voltage" - "Hybrid Battery Block 5 Voltage" = 1.2 V or more
      "Hybrid Battery Block 5 Voltage" - "Hybrid Battery Block 4 Voltage" = 1.2 V or more
      "Hybrid Battery Block 5 Voltage" - "Hybrid Battery Block 6 Voltage" = 1.2 V or more
      "Hybrid Battery Block 6 Voltage" - "Hybrid Battery Block 5 Voltage" = 1.2 V or more
      "Hybrid Battery Block 6 Voltage" - "Hybrid Battery Block 7 Voltage" = 1.2 V or more
      "Hybrid Battery Block 7 Voltage" - "Hybrid Battery Block 6 Voltage" = 1.2 V or more
      "Hybrid Battery Block 7 Voltage" - "Hybrid Battery Block 8 Voltage" = 1.2 V or more
      "Hybrid Battery Block 8 Voltage" - "Hybrid Battery Block 7 Voltage" = 1.2 V or more
      "Hybrid Battery Block 8 Voltage" - "Hybrid Battery Block 9 Voltage" = 1.2 V or more
      "Hybrid Battery Block 9 Voltage" - "Hybrid Battery Block 8 Voltage" = 1.2 V or more
      "Hybrid Battery Block 9 Voltage" - "Hybrid Battery Block 10 Voltage" = 1.2 V or more
      "Hybrid Battery Block 10 Voltage" - "Hybrid Battery Block 9 Voltage" = 1.2 V or more
      GTY906349Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Hybrid Battery Block 1 Voltage *b Hybrid Battery Block 2 Voltage
      *c Hybrid Battery Block 3 Voltage *d Hybrid Battery Block 4 Voltage
      *e Hybrid Battery Block 5 Voltage *f Hybrid Battery Block 6 Voltage
      *g Hybrid Battery Block 7 Voltage *h Hybrid Battery Block 8 Voltage
      *i Hybrid Battery Block 9 Voltage *j Hybrid Battery Block 10 Voltage
      *k Hybrid Battery Block 11 Voltage *l Hybrid Battery Block 12 Voltage

      Result

      Result Proceed to
      On the HV battery blocks 3 to 10, one of the conditions in the table above is met. A
      Other than above B
    4. Turn the ignition switch off.

    Result: 

    B 

    See step  5

    Result: 

    A 

    See step  3

  3. CHECK TOTAL DISTANCE DRIVEN 
    1. Read the odometer to check the total distance the vehicle has been driven.

      Result

      Result Proceed to
      Total distance driven is less than 200000 km (124280 mile) A
      Total distance driven is 200000 km (124280 mile) or more Current total distance driven - total distance driven when hybrid battery terminal block replaced = less than 200000 km (124280 mile) *1
      Other than above B

      HINT: 

      *1: If the hybrid battery terminal block has been replaced, use the total distance driven since it was replaced.

    Result: 

    A 

    REPLACE HV BATTERY 

    Refer to REMOVAL [12/2019 - 10/2022] , or refer to REMOVAL [10/2022 - 11/2023]

    Result: 

    B 

    See step  4

  4. REPLACE HV BATTERY 

    Refer to REMOVAL [12/2019 - 10/2022] , or refer to REMOVAL [10/2022 - 11/2023]

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    REPLACE HYBRID BATTERY TERMINAL BLOCK 

    Refer to REMOVAL [12/2019 - 10/2022] , or refer to REMOVAL [10/2022 - 11/2023]

  5. CHECK FREEZE FRAME DATA (HYBRID CONTROL) 
    1. Read output DTCs.

      Powertrain > Hybrid Control > Trouble Codes 

    2. Using the GTS, make a note of the Freeze Frame Data item "Hybrid Battery Block 1, 2, 11 and 12 Voltage".
    3. Compare the Freeze Frame Data item "Hybrid Battery Block 1, 2, 11 and 12 Voltage" values with those shown in the following combination tables.
      TABLE 1

      Circuit A Battery Block Circuit B Battery Block Condition
      Hybrid Battery Block 1 Voltage Hybrid Battery Block 2 Voltage "Hybrid Battery Block 1 Voltage" - "Hybrid Battery Block 2 Voltage" = 1.2 V or more
      Hybrid Battery Block 12 Voltage Hybrid Battery Block 11 Voltage "Hybrid Battery Block 12 Voltage" - "Hybrid Battery Block 11 Voltage" = 1.2 V or more
      TABLE 2

      Circuit A Battery Block Circuit B Battery Block Condition
      Hybrid Battery Block 1 Voltage Hybrid Battery Block 2 Voltage "Hybrid Battery Block 2 Voltage" - "Hybrid Battery Block 1 Voltage" = 1.2 V or more
      Hybrid Battery Block 12 Voltage Hybrid Battery Block 11 Voltage "Hybrid Battery Block 11 Voltage" - "Hybrid Battery Block 12 Voltage" = 1.2 V or more
      GTY910844Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Hybrid Battery Block 1 Voltage *b Hybrid Battery Block 2 Voltage
      *c Hybrid Battery Block 3 Voltage *d Hybrid Battery Block 4 Voltage
      *e Hybrid Battery Block 5 Voltage *f Hybrid Battery Block 6 Voltage
      *g Hybrid Battery Block 7 Voltage *h Hybrid Battery Block 8 Voltage
      *i Hybrid Battery Block 9 Voltage *j Hybrid Battery Block 10 Voltage
      *k Hybrid Battery Block 11 Voltage *l Hybrid Battery Block 12 Voltage

      HINT: 

      If an internal malfunction occurs in the battery voltage sensor, this symptom (difference in voltage of 1.2 V or more for certain pairs of blocks as shown in the illustration) will occur.

      Result

      Result Proceed to
      Either of the following conditions is met:
      1. All conditions in table 1 are met.
      2. All conditions in table 2 are met.      		 A
      Other than above B
    4. Turn the ignition switch off.

    Result: 

    A 

    REPLACE BATTERY VOLTAGE SENSOR 

    Refer to REMOVAL [12/2019 - 10/2022] , or refer to REMOVAL [10/2022 - 11/2023]

    Result: 

    B 

    See step  6

  6. CHECK TOTAL DISTANCE DRIVEN 
    1. Read the odometer to check the total distance the vehicle has been driven.

      Result

      Result Proceed to
      Total distance driven is less than 200000 km (124280 mile) A
      Total distance driven is 200000 km (124280 mile) or more Current total distance driven - total distance driven when hybrid battery terminal block replaced = less than 200000 km (124280 mile) *1
      Other than above B

      HINT: 

      *1: If the hybrid battery terminal block has been replaced, use the total distance driven since it was replaced.

    Result: 

    A 

    REPLACE HV BATTERY 

    Refer to REMOVAL [12/2019 - 10/2022] , or refer to REMOVAL [10/2022 - 11/2023]

    Result: 

    B 

    See step  7

  7. REPLACE HV BATTERY 

    Refer to REMOVAL [12/2019 - 10/2022] , or refer to REMOVAL [10/2022 - 11/2023]

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    REPLACE HYBRID BATTERY TERMINAL BLOCK 

    Refer to REMOVAL [12/2019 - 10/2022] , or refer to REMOVAL [10/2022 - 11/2023]

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