HYBRID BATTERY SYSTEM, Diagnostic DTC:P0AFC-123

DTC Code DTC Name
P0AFC-123 Hybrid Battery Pack Sensor Module

DESCRIPTION

If the battery voltage sensor detects an internal malfunction, it sends an error signal to the hybrid vehicle control ECU. When the hybrid vehicle control ECU receives the error signal from the battery voltage sensor, the ECU warns the driver and performs fail-safe control.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Warning Indicate

P0AFC-123

Hybrid Battery Pack Sensor Module

The hybrid vehicle control ECU receives an error signal from the battery voltage sensor.

(1 trip detection logic)

  • Battery voltage sensor

  • Wire harness or connector

Comes on

Master Warning Light:

Comes on
Table 1. Related Data List

DTC No.

Data List

P0AFC-123

Auxiliary Battery Vol

WIRING DIAGRAM

B434401E02

CAUTION / NOTICE / HINT

CAUTION:

  • Before inspecting the high-voltage system, take safety precautions to prevent electrical shocks, such as wearing insulated gloves and removing the service plug grip. After removing the service plug grip, put it in your pocket to prevent other technicians from accidentally reconnecting it while you are working on the high-voltage system.

  • After removing the service plug grip, wait for at least 10 minutes before touching any of the high-voltage connectors or terminals. After waiting for 10 minutes, check the voltage at the terminals in the inspection point in the inverter with converter assembly. The voltage should be 0 V before beginning work.

    Click here

    Tip:

    Waiting for at least 10 minutes is required to discharge the high-voltage capacitor inside the inverter with converter assembly.

Note:

After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work.

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Tip:

After the repair, clear the DTCs and perform the following procedure to check that DTCs are not output.

  1. Turn the power switch on (IG) and wait for 10 seconds or more.

PROCEDURE

  1. CHECK HARNESS AND CONNECTOR (IGCT VOLTAGE)

    CAUTION:

    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 manual because this may cause a malfunction.

    2. Remove the No. 2 hybrid vehicle battery shield reinforcement.

      Click here

    3. Connect the cable to the negative (-) auxiliary battery terminal.

    4. Turn the power switch on (IG).

    5. A321038C23

      *a

      Component with harness connected

      (Battery Voltage Sensor)

      Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      y2-1 (IGCT) - y2-5 (GND)

      Power switch on (IG)

      11 to 14 V
      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.

    6. Turn the power switch off.

    7. Disconnect the cable from the negative (-) auxiliary battery terminal.

    8. Install the No. 2 hybrid vehicle battery shield reinforcement.

    Result

    Proceed to

    OK

    NG
    OK

    REPLACE BATTERY VOLTAGE SENSOR

    Click here

    NG

  2. CHECK HARNESS AND CONNECTOR (BATTERY VOLTAGE SENSOR - BODY GROUND)

    CAUTION:

    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 manual because this may cause a malfunction.

    2. Remove the No. 2 hybrid vehicle battery shield reinforcement.

      Click here

    3. A321038C24

      *a

      Component with harness connected

      (Battery Voltage Sensor)

      Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      y2-5 (GND) - Body ground

      Power switch off

      Below 1 Ω

    4. Install the No. 2 hybrid vehicle battery shield reinforcement.

    Result

    Proceed to

    OK

    NG
    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR (IGCT NO. 4 FUSE - BATTERY VOLTAGE SENSOR)

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY VOLTAGE SENSOR - BODY GROUND)