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, which is from the inside of the power source control ECU to the ACC or PWR POINT relay.

Tech Tips

When the power source control ECU is replaced with a new one and the negative (-) battery terminal is connected, 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 ACC relay actuation circuit inside power source control ECU or other related circuit is malfunctioning

  • Main body ECU RH (cowl side junction block RH)

  • Power source control ECU

  • Wire harness or connector

WIRING DIAGRAM

A015Z39E02

INSPECTION PROCEDURE

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG) and turn the intelligent tester main switch on.

    3. Read the Data List according to the displays on the intelligent tester.

      Tech Tips

      When using the intelligent tester with the engine switch off, turn on and off any of the door courtesy light switches repeatedly at 1.5 second intervals or less until communication between the intelligent tester and vehicle starts.

      Body
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      ACC Relay Monitor Status of ACC Relay Monitor / ON or OFF

      ON: Engine switch on (ACC)

      OFF: Engine switch off

      		 -
      OK
      "ON" (Engine switch on (ACC)) appears on the screen.

    NG

    CHECK MAIN BODY ECU RH (COWL SIDE JUNCTION BLOCK RH) Click here

    OK

  2. CHECK FOR DTC


    1. Clear the DTC Click here.

    2. Turn the engine switch on (IG).

    3. After 10 seconds have elapsed, check if the trouble occurs again.

      OK
      DTC B2274 is output.

    NG

    USE SIMULATION METHOD TO CHECK Click here

    OK

    REPLACE POWER SOURCE CONTROL ECU

  3. CHECK MAIN BODY ECU RH (COWL SIDE JUNCTION BLOCK RH)


    1. A0161SWE07

      Disconnect the RA and RD connectors from main body ECU RH (cowl side junction block RH).

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      RD-2 - RA-5 or RD-7 Always 68 to 250 Ω at 20°C (68°F)
      RD-2 - Body ground Always 10 kΩ or higher

    NG

    REPLACE MAIN BODY ECU RH (COWL SIDE JUNCTION BLOCK RH)

    OK

  4. CHECK HARNESS AND CONNECTOR (POWER SOURCE CONTROL ECU - COWL SIDE JUNCTION BLOCK RH)


    1. A0161D7E03

      Disconnect the J55 connector from power source control ECU.

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

      Standard Resistance
      Tester connection Condition Specified Condition
      J55-11 (ACCD) - RD-2 Always Below 1 Ω
      J55-11 (ACCD) or RD-2 - Body ground Always 10 kΩ or higher
      RA-5 - Body ground Always Below 1 Ω
      RD-7 - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CONTROL ECU - COWL SIDE JUNCTION BLOCK RH)

    OK

    REPLACE POWER SOURCE CONTROL ECU