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 smart unit, the ECU warns the driver and performs fail-safe control.

DTC Code DTC Detection Condition Trouble Area
P0AFC-123

  • The hybrid vehicle control ECU receives an error signal from the battery smart unit.

  • A problem with the power source for the battery smart unit.

  • Battery smart unit

  • Auxiliary battery

  • Harness or connector

  • IGCT3 fuse

  • IGCT2 NO. 2 fuse

  • ST CUT / IGCT2 relay

WIRING DIAGRAM

A01H19UE02

INSPECTION PROCEDURE

CAUTION:


  • Before inspecting the high-voltage system or disconnecting the low voltage connector of the inverter with converter assembly, take safety precautions such as wearing insulated gloves and removing the service plug grip to prevent electrical shocks. 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. 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.

Tech Tips


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

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

PROCEDURE


  1. CHECK AUXILIARY BATTERY


    1. Turn the power switch off.

    2. Measure the voltage between the terminals of the auxiliary battery.

      Standard Voltage
      Tester Connection Condition Specified Condition
      Auxiliary battery positive (+) terminal - Auxiliary battery negative (-) terminal Battery electrolyte temperature: 20°C (68°F) 11 to 14 V

    NG

    CHARGE OR REPLACE AUXILIARY BATTERY

    OK

  2. CHECK HARNESS AND CONNECTOR (IGCT VOLTAGE)


    1. A01H1QFE01

      Turn the power switch on (IG).

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      zR3-3 (IGCT) - zR3-16 (GND) Power switch on (IG) 11 to 14 V

      Tech Tips


      • For the removal and installation procedures related to the No. 1 battery pack wire connector inspection, Click here.

      • Perform this inspection with the No. 1 battery pack wire connector connected.


    NG

    CHECK FUSE (IGCT3) Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (NO. 1 BATTERY PACK WIRE CONNECTOR [B SIDE] - BATTERY SMART UNIT)

    CAUTION:

    Be sure to wear insulated gloves.


    1. A01H23ME01

      Remove the HV battery Click here.

    2. Disconnect the z36 battery smart unit connector.

      Tech Tips

      For the removal and installation procedures related to the battery smart unit connector inspection, Click here.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      zR3-3 (IGCT) - z36-1 (IGCT) Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE BATTERY SMART UNIT Click here

  4. CHECK FUSE (IGCT3)


    1. A01GZIOE02

      Turn the power switch off.

    2. Remove the IGCT3 fuse from the luggage room junction block.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      IGCT3 fuse Always Below 1 Ω

    NG

    REPLACE FUSE (IGCT3)

    OK

  5. CHECK FUSE (IGCT2 NO. 2)


    1. A01GW45E05

      Remove the IGCT2 NO. 2 fuse from the engine room No. 3 relay block.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      IGCT2 NO. 2 fuse Always Below 1 Ω

    NG

    REPLACE FUSE (IGCT2 NO. 2)

    OK

  6. INSPECT RELAY (ST CUT / IGCT2)


    1. A01H1JXE02

      Remove the ST CUT / IGCT2 relay from the engine room No. 2 relay block.

    2. A01GZ8X

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3 - 5 Battery voltage is applied between terminals 1 and 2. Below 1 Ω
      Battery voltage is not applied between terminals 1 and 2. 10 kΩ or higher

    NG

    REPLACE RELAY (ST CUT / IGCT2)

    OK

  7. CHECK HARNESS AND CONNECTOR (NO. 1 BATTERY PACK WIRE CONNECTOR [A SIDE] - ST CUT / IGCT2 RELAY)

    CAUTION:

    Be sure to wear insulated gloves.


    1. Disconnect the No. 1 battery pack wire connector.

    2. Install the IGCT3 fuse to the luggage room junction block.

    3. Install the IGCT2 NO. 2 fuse to the engine room No. 3 relay block.

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

      A01GX7VE02
      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      zR3-3 (IGCT) - ST CUT / IGCT2 relay terminal 3 Power switch off Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    CHECK AND REPAIR POWER SOURCE CIRCUIT (ST CUT / IGCT2 RELAY POWER SOURCE)