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Home >> Toyota >> 2022 >> Avalon XLE >> Repair and Diagnosis >> External Pages >> Different car >> Section 12 (Hybrid Control System (Nickel Metal Hydride) - Diagnostic Codes (P0A9B-P0ADD)) >> HYBRID CONTROL SYSTEM (for NICKEL METAL HYDRIDE BATTERY) >> DTC P0ABF-28: Hybrid/EV Battery Current Sensor "A" Signal Bias Level Out of Range/Zero Adjustment Failure [04/2018 - 08/2020] >> Procedure

DTC P0ABF-28: Hybrid/EV Battery Current Sensor "A" Signal Bias Level Out of Range/Zero Adjustment Failure [04/2018 - 08/2020]: Procedure

WARNING: This page is about a different car, the 2020 Toyota Avalon and 2019 Toyota Avalon. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK DTC OUTPUT (HYBRID CONTROL) 
    1. Connect the Techstream 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
      P0AFC-00, P0AFC-96 or P0A95-63 is not output. A
      P0AFC-00, P0AFC-96 or P0A95-63 is output. B
    5. Turn the power switch off.

    Result: 

    B 

    GO TO DTC CHART (HYBRID CONTROL SYSTEM). Refer to  DIAGNOSTIC TROUBLE CODE CHART [04/2018 - 08/2020] 

    Result: 

    A 

    See step  2

  2. CHECK HARNESS AND CONNECTOR (BATTERY VOLTAGE SENSOR - HV BATTERY JUNCTION BLOCK ASSEMBLY) 

    See step  3

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPLACE HYBRID BATTERY THERMISTOR. Refer to  REMOVAL [04/2018 - 08/2020] 

    Result: 

    OK 

    See step  3

  3. CHECK HV BATTERY JUNCTION BLOCK ASSEMBLY (BATTERY CURRENT SENSOR (IB)) 
    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 repair information because this may cause a malfunction.

    2. Remove the No. 1 hybrid battery exhaust duct.

      Refer to PROCEDURE - Step 13

    3. Connect the cable to the negative (-) auxiliary battery terminal.
    4. Turn the power switch on (IG).
    5. Using a toyota electrical tester set to 40 V, measure the VIB voltage according to the value(s) in the table below.
      GTY918910Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Battery Voltage Sensor)
      Tester Connection Switch Condition
      y6-6 (VIB) - y6-12 (GIB) Power switch on (IG)
      NOTE:
      • Turning the power switch on (IG) with the service plug grip removed causes other DTCs to be stored. Clear the DTCs after performing this inspection.
      • Be sure to set the toyota electrical tester to 40 V when performing this test.
    6. Using a toyota electrical tester set to 4 V, measure the IB0 voltage according to the value(s) in the table below.
      GTY918909Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Battery Voltage Sensor)
      Tester Connection Switch Condition
      y6-5 (IB0) - y6-12 (GIB) Power switch on (IG)
      NOTE:

      Be sure to set the Toyota electrical tester to 4 V when performing this test.

    7. Compare the measured values of the IB0 terminal voltage and VIB terminal voltage using the following formula:
      IB0 voltage - VIB Voltage/2 = less than 0.081 V
      IB0 voltage - VIB Voltage/2 = -0.081 V or higher

      Result

      Result Proceed to
      Within the specified range above A
      Other than above B
    8. Turn the power switch off.
    9. Disconnect the cable from the negative (-) auxiliary battery terminal.
    10. Install the No. 1 hybrid battery exhaust duct.

      HINT: 

      When the power switch is on (IG) the actual current will be approximately 0 A. The following graph shows the relation of the actual output voltage of the battery current sensor terminal IB0 and actual current used for DTC judgment.

      GTY724834Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Result: 

    B 

    REPLACE HV BATTERY JUNCTION BLOCK ASSEMBLY. Refer to  REMOVAL [04/2018 - 08/2020] 

    Result: 

    A 

    See step  4

  4. REPLACE BATTERY VOLTAGE SENSOR 

    Refer to REMOVAL [04/2018 - 08/2020]

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  5

  5. SIMULATION TEST 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Enter the following menus: Powertrain/Hybrid Control/Trouble Codes.
    4. Clear the DTCs and freeze frame data.

      Powertrain > Hybrid Control > Clear DTCs 

    5. Drive the vehicle on urban roads for approximately 10 minutes.
    6. Turn the power switch off and wait for 2 minutes or more.
    7. Turn the power switch on (IG) and wait for 10 seconds or more.

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  6

  6. RECONFIRM DTC OUTPUT (HYBRID CONTROL) 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Enter the following menus: Powertrain/Hybrid Control/Trouble Codes.

      Powertrain > Hybrid Control > Trouble Codes 

    4. Read output DTCs.

      Result

      Result Proceed to
      P0ABF-28 is not output. A
      P0ABF-28 is output. B
    5. Turn the power switch off.

    Result: 

    A 

    END 

    Result: 

    B 

    REPLACE HV BATTERY JUNCTION BLOCK ASSEMBLY. Refer to  REMOVAL [04/2018 - 08/2020] 

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