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

DTC Code DTC Name
B2274 ACC Monitor Malfunction

DESCRIPTION

This DTC is stored when a malfunction in the ACC output circuit is detected. The ACC output circuit is the circuit that goes from the ACC output terminal of the certification ECU (smart key ECU assembly) to the ACC relay.

Tip:

When the cable is disconnected and reconnected to the negative (-) battery terminal, the power source mode returns to the state it was in before the cable was disconnected.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Note

B2274

ACC Monitor Malfunction

Malfunction in the ACC relay circuit in the certification ECU (smart key ECU assembly) or in the external circuit (1-trip detection logic*1).

Tip:

When the voltage at terminal ACCD is not at the standard, the system is determined to be malfunctioning.

  • AM2 fuse

  • ACC relay (Instrument panel junction block assembly)

  • Certification ECU (smart key ECU assembly)

  • Wire harness or connector

Wait 10 seconds after turning the engine switch on (ACC) or on (IG), and then wait another 10 seconds after turning the engine switch off.

Tip:

To turn the engine switch on (ACC), carry an electrical key transmitter sub-assembly and press the engine switch with the shift lever in P*2 or N*3 and the brake pedal*2, *3 or clutch pedal*4 released.

  • *1: Only detected while a malfunction is present.

  • *2: for CVT

  • *3: for Multi-Mode Manual Transaxle

  • *4: for Manual Transaxle

Table 1. Vehicle Condition and Fail-safe Function when Malfunction Detected

Vehicle Condition when Malfunction Detected

Fail-safe Function when Malfunction Detected

  • If there is a malfunction due to the relay being stuck on, the ACC relay does not turn off even though the engine switch is off.

  • If there is a malfunction due to the relay being stuck off, the ACC relay does not turn on even though the engine switch is on (ACC).

Tip:

The engine switch can be turned on (IG) and the engine can be started.

-
Table 2. Related Data List and Active Test Items

DTC No.

Data List Item

Active Test Item

B2274

  • Power Source Control

  • ACC Relay Monitor

  • Starting Control

  • Ignition

-

WIRING DIAGRAM

B327840E07

CAUTION / NOTICE / HINT

Note:

  • When using the GTS with the engine switch off, connect the GTS to the DLC3 and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the GTS and the vehicle begins. Then select the Model Code "KEY REGIST" under manual mode and enter the following menus: Body Electrical / Entry&Start(CAN). While using the GTS, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the GTS and the vehicle.

  • The entry and start system (for Start Function) uses a multiplex communication system (LIN communication system) and the CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting (Click hereClick here). Troubleshoot the entry and start system (for Start Function) after confirming that the communication systems are functioning properly.

  • Before replacing the certification ECU (smart key ECU assembly), refer to the entry and start system (for Start Function) precaution.

    Click hereClick here

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

  • After performing repairs, perform the operation that fulfills the DTC output confirmation operation, and then confirm that no DTCs are output again.

PROCEDURE

  1. CHECK HARNESS AND CONNECTOR (POWER SOURCE)

    Click here

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR IN CIRCUIT CONNECTED TO POWER SOURCE

    OK

  2. CHECK HARNESS AND CONNECTOR (GROUND)

    Click here

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

    1. Disconnect the E35 certification ECU (smart key ECU assembly) connector.

    2. Disconnect the 3D instrument panel junction block assembly connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      E35-4 (ACCD) - 3D-25

      Always

      Below 1 Ω

      3C-9 - Body ground

      Always

      Below 1 Ω

      E35-4 (ACCD) or 3D-25 - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (ACC RELAY)

    1. Remove the instrument panel junction block assembly.

      for LHD:Click hereClick here

      for RHD:Click hereClick here

      B331649C01

      *a

      Component without harness connected

      (Instrument Panel Junction Block Assembly)

      -

      -

    2. Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.

      for LHD:Click hereClick here

      for RHD:Click hereClick here

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      3B-1 - 3D-13

      Battery voltage not applied to terminals 3D-25 and 3C-9

      10 kΩ or higher

      Battery voltage applied to terminals 3D-25 and 3C-9

      Below 1 Ω

    Result

    Result

    Proceed to

    OK

    A

    NG (for LHD)

    B

    NG (for RHD)

    C
    B

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

    Click hereClick here

    C

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

    Click hereClick here

    A

  5. INSPECT CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    1. B268626C06

      *a

      Component with harness connected

      (Certification ECU (Smart Key ECU Assembly))

      Reconnect the E35 certification ECU (smart key ECU assembly) connector.

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

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      E35-4 (ACCD) - Body ground

      Engine switch off → Engine switch on (ACC)

      1 V or less → 8.5 V or higher

    Result

    Proceed to

    OK

    NG
    OK

    USE SIMULATION METHOD TO CHECK

    Click hereClick hereClick hereClick hereClick hereClick hereClick here

    NG

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)