DTC P0ABF-28: Hybrid/EV Battery Current Sensor "A" Signal Bias Level Out of Range / Zero Adjustment Failure [11/2023 - ]: Procedure

1. 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 also output.	B

2. Turn the ignition switch off.

Result: 

B 

GO TO DTC CHART (HYBRID CONTROL SYSTEM) 

Refer to DIAGNOSTIC TROUBLE CODE CHART [11/2023 - ]

Result: 

A 

See step  2

See step  3

Result

Result: 

NG 

REPLACE HYBRID BATTERY THERMISTOR (WIRE HARNESS OR CONNECTOR) 

Refer to REMOVAL [11/2023 - ]

Result: 

OK 

See step  3

1. Check that the service plug grip is not installed.
   NOTE:

   After removing the service plug grip, do not turn the ignition switch to ON (READY), unless instructed by the repair information because this may cause a malfunction.

2. Disconnect the z13 battery current sensor connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NOTE:

   Before disconnecting the connector, check that it is not loose or disconnected.

3. Remove the HV battery junction block assembly.

   Refer to REMOVAL [11/2023 - ]

4. Connect the z13 battery current sensor connector.
5. Connect the cable to the negative (-) auxiliary battery terminal.
6. Turn the ignition switch to ON.
7. Using a Toyota electrical tester set to 40 V, measure the VIB voltage according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component with harness connected (Battery Voltage Sensor)

   Tester Connection	Switch Condition
   z12-10 (VIB) - z12-22 (GIB)	Ignition switch ON

   NOTE:

   • Turning the ignition switch to ON 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.
8. Using a Toyota electrical tester set to 4 V, measure the IB0 voltage according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component with harness connected (Battery Voltage Sensor)

   Tester Connection	Switch Condition
   z12-9 (IB0) - z12-22 (GIB)	Ignition switch ON

   NOTE:

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

9. 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

10. Turn the ignition switch off.
11. Disconnect the cable from the negative (-) auxiliary battery terminal.
12. Install the HV battery junction block assembly.

    HINT: 

    When the ignition switch is ON, the actual current will be approximately 0 A. The following graph shows the relation between the actual output voltage of the battery current sensor terminal IB0 and the actual current used for DTC judgment.

    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Result: 

B 

REPLACE HV BATTERY JUNCTION BLOCK ASSEMBLY 

Refer to REMOVAL [11/2023 - ]

Result: 

A 

See step  4

Refer to REMOVAL [11/2023 - ]

Result

Result: 

NEXT 

See step  5

1. Clear the DTCs and Freeze Frame Data.

   Powertrain > Hybrid Control > Clear DTCs 

2. Drive the vehicle on urban roads for approximately 10 minutes.
3. Turn the ignition switch off and wait for 2 minutes or more.
4. Turn the ignition switch to ON and wait for 10 seconds or more.

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  6

1. Read output DTCs.

   Powertrain > Hybrid Control > Trouble Codes 

   Result

   Result	Proceed to
   P0ABF-28 is not output.	A
   P0ABF-28 is output.	B

2. Turn the ignition switch off.

Result: 

A 

END 

Result: 

B 

REPLACE HV BATTERY JUNCTION BLOCK ASSEMBLY 

Refer to REMOVAL [11/2023 - ]