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

DTC Code DTC Name
B2274 ACC Monitor Malfunction

DESCRIPTION

This DTC is stored 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 to the ACC relay.

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

  • AM2 fuse

  • ACC relay

  • Power management control ECU

  • Main Body ECU (driver side junction block assembly)

  • Wire harness or connector

WIRING DIAGRAM

A01ELB8E03

INSPECTION PROCEDURE

Note


  • When the power management control ECU is replaced with a new one and the cable from the negative (-) battery terminal is connected, the power source mode becomes the on (IG) mode. When the battery is removed and reinstalled, the power source mode that was selected when the battery was removed is restored.

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

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (BATTERY - POWER MANAGEMENT CONTROL ECU)


    1. A01EIV4E06
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Power Management Control ECU)

      Disconnect the D43 connector from the power management control ECU.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      D43-1 (AM22) - Body ground Always 9.5 to 16 V
      D43-2 (AM21) - Body ground Always 9.5 to 16 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - POWER MANAGEMENT CONTROL ECU)

    OK

  2. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - BODY GROUND)


    1. A01EIV4E02
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Power Management Control ECU)

      Disconnect the D43 connector from the power management control ECU.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D43-5 (GND2) - Body ground Always Below 1 Ω
      D43-6 (GND) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER MANAGEMENT CONTROL ECU - BODY GROUND)

    OK

  3. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - DRIVER SIDE JUNCTION BLOCK)


    1. Disconnect the 2G connector from the main body ECU (driver side junction block assembly).

      A01EJCCE03

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D43-19 (ACCD) - 2G-9 Always Below 1 Ω
      D43-19 (ACCD) - Body ground Always 10 kΩ or higher
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Power Management Control ECU)

      		 *2

      Front view of wire harness connector

      (to Main Body ECU (Driver Side Junction Block Assembly))

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER MANAGEMENT CONTROL ECU - DRIVER SIDE JUNCTION BLOCK)

    OK

  4. CHECK HARNESS AND CONNECTOR (DRIVER SIDE JUNCTION BLOCK - BODY GROUND)


    1. A01EKPPE01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Main Body ECU (Driver Side Junction Block Assembly))

      Disconnect the 2F connector from the main body ECU (driver side junction block assembly).

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2F-16 - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (DRIVER SIDE JUNCTION BLOCK - BODY GROUND)

    OK

  5. INSPECT ACC RELAY


    1. A01EKXQ

      Remove the ACC relay from the main body ECU (driver side junction block assembly).

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1 - 2 Always 93.8 to 136.4 Ω
      3 - 5 When battery voltage is not applied to terminals 1 and 2 10 kΩ or higher
      3 - 5 When battery voltage is applied to terminals 1 and 2 Below 1 Ω

    NG

    REPLACE ACC RELAY

    OK

  6. INSPECT MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK ASSEMBLY)


    1. Remove the main body ECU (driver side junction block assembly) Click here.

      A01EKV8E01

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2G-9 - ACC relay terminal 2 Always Below 1 Ω
      2G-9 - Body ground Always 10 kΩ or higher
      2F-16 - ACC relay terminal 1 Always Below 1 Ω
      2F-16 - Body ground Always 10 kΩ or higher
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Main Body ECU (Driver Side Junction Block Assembly))

      		 *3

      Front view of wire harness connector

      (to Main Body ECU (Driver Side Junction Block Assembly))
      *2

      Component without relay connected

      (ACC Relay Terminal)

      		 - -

    NG

    REPLACE MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK ASSEMBLY) Click here

    OK

    REPLACE POWER MANAGEMENT CONTROL ECU Click here