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Home >> Toyota >> 2020 >> Avalon Limited >> Repair and Diagnosis >> Hybrid/Electric Powertrain >> Testing and Diagnosis >> 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

  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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