ENTRY AND START SYSTEM (for Start Function), Diagnostic DTC:B2274

DTC Code DTC Name
B2274 ACC Monitor Malfunction

DESCRIPTION

This DTC is output when there is a problem in the ACC output circuit. The ACC circuit is the circuit that goes from inside the power management control ECU*1 or power source control ECU*2 to the ACC relay.

Tech Tips

When the power management control ECU*1 or power source control ECU*2 is replaced with a new one and the cable is connected to the negative (-) battery terminal, the power source mode becomes the IG-ON mode. When the battery is removed and reinstalled, the power source mode that was selected when the battery was removed is restored.

DTC No. DTC Detection Condition Trouble Area
B2274 The ACC relay actuation circuit inside power management control ECU*1 or power source control ECU*2 or other related circuit is malfunctioning.

  • AM2 No. 2 fuse

  • MAIN fuse

  • Instrument panel junction block assembly (ACC relay)

  • Power management control ECU*1

  • Power source control ECU*2

  • Wire harness or connector

*1: for 1KR-FE and 1NR-FE

*2: for 1ND-TV

WIRING DIAGRAM

A0118F2E01

INSPECTION PROCEDURE

Note

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (POWER SOURCE)

    A011B8UE33
    Text in Illustration
    *A for 1KR-FE and 1NR-FE
    *B for 1ND-TV
    *1

    Rear view of wire harness connector

    (to Power Management Control ECU) (for 1KR-FE and 1NR-FE)
    *2

    Rear view of wire harness connector

    (to Power Source Control ECU) (for 1ND-TV)

    1. Disconnect the D38 or D73 ECU connector.

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


      1. for 1KR-FE and 1NR-FE

        Standard Voltage
        Tester Connection Condition Specified Condition
        D38-2 (AM21) - Body ground Always 9.5 to 16 V
        D38-1 (AM22) - Body ground

      2. for 1ND-TV

        Standard Voltage
        Tester Connection Condition Specified Condition
        D73-2 (AM21) - Body ground Always 9.5 to 16 V
        D73-1 (AM22) - Body ground

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. CHECK HARNESS AND CONNECTOR (GROUND)

    A011B8UE34
    Text in Illustration
    *A for 1KR-FE and 1NR-FE
    *B for 1ND-TV
    *1

    Rear view of wire harness connector

    (to Power Management Control ECU) (for 1KR-FE and 1NR-FE)
    *2

    Rear view of wire harness connector

    (to Power Source Control ECU) (for 1ND-TV)

    1. Disconnect the D38 or D73 ECU connector.

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


      1. for 1KR-FE and 1NR-FE

        Standard Resistance
        Tester Connection Condition Specified Condition
        D38-6 (GND) - Body ground Always Below 1 Ω
        D38-5 (GND2) - Body ground

      2. for 1ND-TV

        Standard Resistance
        Tester Connection Condition Specified Condition
        D73-6 (GND) - Body ground Always Below 1 Ω
        D73-5 (GND2) - Body ground

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (ACC RELAY)


    1. Disconnect the instrument panel junction block assembly connectors.

      A011AADE01
      Text in Illustration
      *1

      Component without harness connected

      (Instrument Panel Junction Block Assembly)

      		 - -

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3A-1 - 3B-11 When battery voltage absent 10 kΩ or higher
      When battery voltage is applied to terminals 3D-27 and 3C-10 Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS, CONNECTOR OR INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Click here

    OK

  4. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - ECU)


    1. A0118BDE02
      Text in Illustration
      *A for 1KR-FE and 1NR-FE
      *B for 1ND-TV
      *1

      Rear view of wire harness connector

      (to Power Management Control ECU) (for 1KR-FE and 1NR-FE)
      *2

      Rear view of wire harness connector

      (to Power Source Control ECU) (for 1ND-TV)
      *3

      Front view of wire harness connector

      (to Instrument Panel Junction Block)

      Disconnect the D38 or D73 ECU connector.

    2. Disconnect the instrument panel junction block assembly connectors.

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


      1. for 1KR-FE and 1NR-FE

        Standard Resistance
        Tester Connection Condition Specified Condition
        D38-19 (ACCD) - 3D-27 Always Below 1 Ω
        3C-10 - Body ground

      2. for 1ND-TV

        Standard Resistance
        Tester Connection Condition Specified Condition
        D73-19 (ACCD) - 3D-27 Always Below 1 Ω
        3C-10 - Body ground
        Result
        Result Proceed to
        OK (for 1KR-FE and 1NR-FE) A
        NG (for 1KR-FE and 1NR-FE) B
        OK (for 1ND-TV) C
        NG (for 1ND-TV) D

    B

    REPAIR OR REPLACE HARNESS, CONNECTOR OR INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Click here

    C

    INSPECT POWER SOURCE CONTROL ECU Click here

    D

    REPAIR OR REPLACE HARNESS, CONNECTOR OR INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Click here

    A

  5. INSPECT POWER MANAGEMENT CONTROL ECU


    1. A0118F0E02
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to Power Management Control ECU)

      Reconnect the power management control ECU connectors.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      D38-19 (ACCD) - Body ground Engine switch off Below 1 V
      Engine switch on (IG) Output voltage at terminal AM21 or AM22 is -2 V or more.

    NG

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

    OK

    END

  6. REPAIR OR REPLACE HARNESS, CONNECTOR OR INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY


    1. Replace with a new or normally functioning part. Repair or replace any damaged wire harness or connector.


    NEXT

  7. INSPECT POWER MANAGEMENT CONTROL ECU


    1. A0118F0E02
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to Power Management Control ECU)

      Reconnect the power management control ECU connectors.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      D38-19 (ACCD) - Body ground Engine switch off Below 1 V
      Engine switch on (IG) Output voltage at terminal AM21 or AM22 is -2 V or more.

    NG

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

    OK

    END

  8. INSPECT POWER SOURCE CONTROL ECU


    1. A0118F0E04
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to Power Source Control ECU)

      Reconnect the power source control ECU connectors.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      D73-19 (ACCD) - Body ground Engine switch off Below 1 V
      Engine switch on (IG) Output voltage at terminal AM21 or AM22 is -2 V or more.

    NG

    REPLACE POWER SOURCE CONTROL ECU Click here

    OK

    END

  9. REPAIR OR REPLACE HARNESS, CONNECTOR OR INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY


    1. Replace with a new or normally functioning part. Repair or replace any damaged wire harness or connector.


    NEXT

  10. INSPECT POWER SOURCE CONTROL ECU


    1. A0118F0E04
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to Power Source Control ECU)

      Reconnect the power source control ECU connectors.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      D73-19 (ACCD) - Body ground Engine switch off Below 1 V
      Engine switch on (IG) Output voltage at terminal AM21 or AM22 is -2 V or more.

    NG

    REPLACE POWER SOURCE CONTROL ECU Click here

    OK

    END