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, which is from the ACC output terminal of the power management control ECU to the ACC relay.

Tech Tips

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

DTC Code DTC Detection Condition Trouble Area
B2274 The ACC relay actuation circuit inside the power management control ECU or other related circuit is malfunctioning.

  • AM2 NO. 2 fuse

  • ACC relay

  • Power management control ECU

  • Harness or connector

WIRING DIAGRAM

A004RLLE08
*a from Battery
*b AM2 NO. 2
*c Power Management Control ECU
*d Instrument Panel Junction Block Assembly

CAUTION / NOTICE / HINT

Note


  • When using the GTS with the engine switch off to troubleshoot: Connect the GTS to the vehicle, and turn a courtesy light switch on and off at 1.5 second intervals until communication between the GTS and vehicle begins.

  • Before performing the inspection, check that there are no problems related to the CAN communication system and LIN communication system.

  • 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. A004QWRE02
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to Power Management Control ECU)

      Disconnect the D111 power management control ECU connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      D111-2 (AM21) - Body ground Always 9.5 to 16 V
      D111-1 (AM22) - Body ground

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Disconnect the D111 power management control ECU connector.

    2. A004TGOE02
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to Power Management Control ECU)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D111-6 (GND) - Body ground Always Below 1 Ω
      D111-5 (GND2) - Body ground

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)


    1. Disconnect the D111 power management control ECU and DM instrument panel junction block assembly connectors.

      A004TEAE01
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to Power Management Control ECU)

      		 *2

      Front view of wire harness connector

      (to 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
      D111-19 (ACCD) - DM-7 20°C (68°F) 88.9 to 93 Ω
      D111-19 (ACCD) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR, OR REPLACE ACC RELAY Click here

    OK

  4. INSPECT ACC RELAY


    1. A004QLCE32

      Remove the ACC relay.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      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

    REPAIR OR REPLACE HARNESS OR CONNECTOR, OR REPLACE ACC RELAY Click here

    OK

  5. CHECK POWER MANAGEMENT CONTROL ECU


    1. Connect the power management control ECU connector.

      A004SK3E01
      Text in Illustration
      *1

      Component with harness connected

      (Power Management Control ECU)

      		 - -

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      D111-19 (ACCD) - Body ground Engine switch off Below 1.0 V
      Engine switch on (ACC) ((Voltage at terminal AM21 or AM22) minus 2.0 V) or higher

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

  6. REPAIR OR REPLACE HARNESS OR CONNECTOR, OR REPLACE ACC RELAY


    1. Replace the ACC relay with a new or normally functioning part, or repair or replace any damaged harness or connector.


    NEXT

  7. CHECK POWER MANAGEMENT CONTROL ECU


    1. Connect the power management control ECU connector.

      A004SK3E01
      Text in Illustration
      *1

      Component with harness connected

      (Power Management Control ECU)

      		 - -

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      D111-19 (ACCD) - Body ground Engine switch off Below 1.0 V
      Engine switch on (ACC) ((Voltage at terminal AM21 or AM22) minus 2.0 V) or higher

    OK

    END

    NG

    REPLACE POWER MANAGEMENT CONTROL ECU Click here