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Home >> Lexus >> 2020 >> UX 200 Luxury >> Repair and Diagnosis >> External Pages >> Different car >> Section 42 (Hybrid Control System (Diagnostic Codes) (2 Of 5)) >> Hybrid Control System >> DTC P0ABF-28: Hybrid/EV Battery Current Sensor "A" Signal Bias Level Out of Range / Zero Adjustment Failure [10/2018 - ] >> Procedure

DTC P0ABF-28: Hybrid/EV Battery Current Sensor "A" Signal Bias Level Out of Range / Zero Adjustment Failure [10/2018 - ]: Procedure

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  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
      "P0AFC00, P0AFC96 or P0A9563" is not output. A
      "P0AFC00, P0AFC96 or P0A9563" is also output. B
    5. Turn the power switch off.

    Result: 

    B 

    GO TO DTC CHART (HYBRID CONTROL SYSTEM). Refer to  DIAGNOSTIC TROUBLE CODE CHART [10/2018 - ] 

    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 [10/2018 - 07/2022]  Refer to  REMOVAL [07/2022 - ] 

    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 appropriate service information because this may cause a malfunction.

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

      Refer to PROCEDURE - Step 20 [10/2018 - 07/2022] Refer to PROCEDURE - Step 20 [07/2022 - ]

    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.
      GTY830547Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Battery Voltage Sensor)
      Tester Connection Switch Condition
      z12-6 (VIB) - z12-12 (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.
      GTY830548Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Battery Voltage Sensor)
      Tester Connection Switch Condition
      z12-5 (IB0) - z12-12 (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 [10/2018 - 07/2022]  Refer to  REMOVAL [07/2022 - ] 

    Result: 

    A 

    See step  4

  4. REPLACE BATTERY VOLTAGE SENSOR 

    Refer to REMOVAL [10/2018 - 07/2022] Refer to REMOVAL [07/2022 - ]

    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 > Trouble Codes 

    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.
    4. Read output DTCs.

      Powertrain > Hybrid Control > Trouble Codes 

    5. Turn the power switch off.

      Result

      Result Proceed to
      P0ABF28 is not output. A
      P0ABF28 is output. B

    Result: 

    A 

    COMPLETED 

    Result: 

    B 

    REPLACE HV BATTERY JUNCTION BLOCK ASSEMBLY. Refer to  REMOVAL [10/2018 - 07/2022]  Refer to  REMOVAL [07/2022 - ] 

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