HYBRID BATTERY SYSTEM, Diagnostic DTC:P0AFC-123

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

DESCRIPTION


DTC No. DTC Detection Condition Trouble Area
P0AFC-123 The power management control ECU receives an error signal from the battery smart unit.

  • Battery smart unit

  • Wire harness or connector

  • IGCT fuse

  • IGCT No. 2 fuse

  • IGCT relay

WIRING DIAGRAM

A01J9MPE01

INSPECTION PROCEDURE

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 disconnecting the service plug grip, wait for at least 10 minutes before touching any of the high-voltage connectors or terminals.

    Tech Tips

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

Note

After the power switch is turned off, the display and navigation module display (HDD navigation system) records various types of memory and settings. As a result, after turning the power switch off, make sure to wait at least 60 seconds before disconnecting the cable from the negative (-) battery terminal.

Tech Tips

After repairing, restart the system (turn the power switch on (READY)) and recheck for DTCs Click here.

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (IGCT VOLTAGE)

    CAUTION:

    Be sure to wear insulated gloves.


    1. Disconnect the cable from the negative (-) battery terminal.

    2. 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.

    3. Remove the No. 1 hybrid vehicle battery carrier bracket sub-assembly Click here.

    4. Connect the cable to the negative (-) battery terminal.

    5. Turn the power switch on (IG).

    6. A01JBYOE03
      Text in Illustration
      *1

      Component with harness connected

      (Battery Smart Unit)

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      c1-4 (IGCT) - c1-8 (GND) Power switch on (IG) 11 to 14 V

      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.

      • Turning the power switch on (IG) with the service plug grip removed causes an interlock switch system DTC (P0A0D-350) to be set. Use the intelligent tester to clear the DTCs Click here.

    7. Turn the power switch off.

    8. Install the No. 1 hybrid vehicle battery carrier bracket sub-assembly Click here.


    NG

    CHECK FUSE (IGCT, IGCT NO. 2) Click here

    OK

    REPLACE BATTERY SMART UNIT Click here

  2. CHECK FUSE (IGCT, IGCT NO. 2)


    1. A01JBW3E01
      Text in Illustration
      *1 Engine Room Junction Block Assembly
      *2 IGCT Fuse
      *3 IGCT No. 2 Fuse

      Remove the IGCT and IGCT No. 2 fuses from the engine room junction block assembly.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      IGCT fuse Always Below 1 Ω
      IGCT No. 2 fuse Always Below 1 Ω

    3. Install the IGCT and IGCT No. 2 fuses to the engine room junction block assembly.


    NG

    REPLACE FUSE (IGCT, IGCT NO. 2)

    OK

  3. CHECK RELAY (IGCT)


    1. A01J97KE01
      Text in Illustration
      *1 Engine Room Junction Block Assembly
      *2 IGCT Relay

      Remove the IGCT relay from the engine room junction block assembly.

    2. A01J91BE17

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3 - 5 Auxiliary battery voltage is applied between terminals 1 and 2 10 kΩ or more
      Auxiliary battery voltage is not applied between terminals 1 and 2 below 1 Ω

    3. Install the IGCT relay to the engine room junction block assembly.


    NG

    REPLACE RELAY (IGCT)

    OK

  4. CHECK HARNESS AND CONNECTOR (IGCT RELAY - BATTERY SMART UNIT)

    CAUTION:

    Be sure to wear insulated gloves.


    1. Disconnect the cable from the negative (-) battery terminal.

    2. A01J97KE01
      Text in Illustration
      *1 Engine Room Junction Block Assembly
      *2 IGCT Relay

      Remove the IGCT relay from the engine room junction block assembly.

    3. 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.

    4. Remove the No. 1 hybrid vehicle battery carrier bracket sub-assembly Click here.

    5. A01J9DNE03

      Disconnect only the c1 connector of the battery smart unit.

    6. A01JD99E01
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to Battery Smart Unit)
      *2 Engine Room Junction Block Assembly
      *3 IGCT relay terminal 5

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      IGCT relay terminal 5 - c1-4 (IGCT) Power switch off Below 1 Ω

    7. Connect the c1 connector of the battery smart unit.

    8. Install the No. 1 hybrid vehicle battery carrier bracket sub-assembly Click here.

    9. Install the IGCT relay to the engine room junction block assembly.

    10. Connect the cable to the negative (-) battery terminal.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    CHECK AND REPAIR POWER SOURCE CIRCUIT