ENTRY AND START SYSTEM (for Start Function), Diagnostic DTC:B2271

DTC Code DTC Name
B2271 Ignition Hold Monitor Malfunction

DESCRIPTION

This DTC is output when a problem such as an open in the AM2 NO. 2 fuse, an open or short in the wire harness between the fuse and power management control ECU*1 or power source control ECU*2, a short in the IG output circuit inside the power management control ECU*1 or power source control ECU*2, a short between the power management control ECU*1 or power source control ECU*2 and relay, and a short in the relay is detected.

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
B2271 The hold circuit, IG1 relay actuation circuit or IG2 relay actuation circuit inside power management control ECU*1 or power source control ECU*2 is open or short

  • AM2 No. 2 fuse

  • MAIN fuse

  • Instrument panel junction block assembly (IG1 relay 1, 2)

  • Integration relay (IG2 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

A011ACLE01

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 AND INTEGRATION RELAY (IG1 NO. 1 RELAY, IG1 NO. 2 RELAY AND IG2 RELAY)


    1. Disconnect the instrument panel junction block assembly connectors.

      A0117KWE01
      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 - 3C-36 When battery voltage absent 10 kΩ or higher
      3A-1 - 3B-1
      3A-1 - 3C-36 When battery voltage is applied to terminals 3C-23 and 3C-10 Below 1 Ω
      3A-1 - 3B-1
    3. A0118L2E01
      Text in Illustration
      *1

      Component without harness connected

      (Integration Relay)

      Remove the integration relay from the engine room relay block.

    4. 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
        1A-1 - 1B-6 When battery voltage absent 10 kΩ or higher
        When battery voltage is applied to terminals 1D-11 and 1C-3 Below 1 Ω

      2. for 1ND-TV

        Standard Resistance
        Tester Connection Condition Specified Condition
        1A-1 - 1D-1 When battery voltage absent 10 kΩ or higher
        When battery voltage is applied to terminals 1D-11 and 1C-3 Below 1 Ω
      Result
      Result Proceed to
      OK A
      NG (for 1KR-FE and 1NR-FE) B
      NG (for 1ND-TV) C

    B

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

    C

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

    A

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


    1. A0117X8E02
      Text in Illustration
      *A for 1KR-FE and 1NR-FE
      *B for 1ND-TV
      *1

      Front view of wire harness connector

      (to Instrument Panel Junction Block Assembly)
      *2

      Rear view of wire harness connector

      (to Power Management Control ECU) (for 1KR-FE and 1NR-FE)
      *3

      Rear view of wire harness connector

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

      Disconnect the instrument panel junction block assembly connectors.

    2. Disconnect the D38 or D73 ECU connector.

    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
        D38-20 (IG1D) - 3C-23 Always Below 1 Ω
        3C-10 - Body ground

      2. for 1ND-TV

        Standard Resistance
        Tester Connection Condition Specified Condition
        D73-20 (IG1D) - 3C-23 Always Below 1 Ω
        3C-10 - Body ground
        Result
        Result Proceed to
        OK A
        NG (for 1KR-FE and 1NR-FE) B
        NG (for 1ND-TV) C

    B

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

    C

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

    A

  5. CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY - ECU)


    1. A011B80E02
      Text in Illustration
      *A for 1KR-FE and 1NR-FE
      *B for 1ND-TV
      *1

      Front view of wire harness connector

      (to Integration Relay)
      *2

      Rear view of wire harness connector

      (to Power Management Control ECU) (for 1KR-FE and 1NR-FE)
      *3

      Rear view of wire harness connector

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

      Remove the integration relay from the engine room relay block.

    2. Disconnect the D36 or D72 ECU connector.

    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
        D36-8 (IG2D) - 1D-11 Always Below 1 Ω
        1C-3 - Body ground

      2. for 1ND-TV

        Standard Resistance
        Tester Connection Condition Specified Condition
        D72-8 (IG2D) - 1D-12 Always Below 1 Ω
        1C-6 - Body ground
        Result
        Result Proceed to
        OK (for 1KR-FE and 1NR-FE) A
        OK (for 1ND-TV) B
        NG (for 1KR-FE and 1NR-FE) C
        NG (for 1ND-TV) D

    B

    INSPECT POWER SOURCE CONTROL ECU Click here

    C

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

    D

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

    A

  6. INSPECT POWER MANAGEMENT CONTROL ECU


    1. A0118F0E01
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to Power Management Control ECU)

      Reconnect the D36 and D38 ECU connectors.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      D36-8 (IG2D) - Body ground Engine switch off Below 1 V
      Engine switch on (IG) Output voltage at terminal AM21 or AM22 is -2 V or more.
      D38-20 (IG1D) - 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

  7. REPAIR OR REPLACE HARNESS, CONNECTOR, INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY OR INTEGRATION RELAY


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


    NEXT

  8. INSPECT POWER MANAGEMENT CONTROL ECU


    1. A0118F0E01
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to Power Management Control ECU)

      Reconnect the D36 and D38 ECU connectors.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      D36-8 (IG2D) - Body ground Engine switch off Below 1 V
      Engine switch on (IG) Output voltage at terminal AM21 or AM22 is -2 V or more.
      D38-20 (IG1D) - 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

  9. INSPECT POWER SOURCE CONTROL ECU


    1. A0118F0E03
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to Power Source Control ECU)

      Reconnect the D72 and D73 ECU connectors.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      D72-8 (IG2D) - Body ground Engine switch off Below 1 V
      Engine switch on (IG) Output voltage at terminal AM21 or AM22 is -2 V or more.
      D73-20 (IG1D) - 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

  10. REPAIR OR REPLACE HARNESS, CONNECTOR, INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY OR INTEGRATION RELAY


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


    NEXT

  11. INSPECT POWER SOURCE CONTROL ECU


    1. A0118F0E03
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to Power Source Control ECU)

      Reconnect the D72 and D73 ECU connectors.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      D72-8 (IG2D) - Body ground Engine switch off Below 1 V
      Engine switch on (IG) Output voltage at terminal AM21 or AM22 is -2 V or more.
      D73-20 (IG1D) - 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