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 power management control ECU to the ACC relay.

Tech Tips

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

DTC Code DTC Detection Condition Trouble Area DTC Output Confirmation Operation
B2274

Malfunction in the ACC relay circuit in the power management control ECU or in the external circuit (1-trip detection logic*).

Tech Tips

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

  • AM2 fuse

  • RH-ACC relay (cowl side junction block RH)

  • Power management control ECU

  • Wire harness or connector

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

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 power 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 power switch is on (ACC).

Tech Tips

The power switch can be turned on (IG) and the hybrid control system can be started.

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Related Data List and Active Test Items
DTC Data List Item Active Test Item
B2274

    Power Source Control

  • ACC Relay Monitor

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WIRING DIAGRAM

A01FVTJE01

INSPECTION PROCEDURE

Note


  • When using the GTS with the power switch off to troubleshoot:

    Connect the GTS to the DLC3 and turn a courtesy light switch on and off at 1.5 second intervals until communication between the GTS and vehicle begins.

  • 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 here. Troubleshoot the entry and start system (for Start Function) after confirming that the communication systems are functioning properly.

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

  • Before replacing the power management control ECU, refer to the entry and start system (for Start Function) precaution Click here.

  • 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)

    A01FSZZE12
    Text in Illustration
    *a

    Front view of wire harness connector

    (to Power Management Control ECU)

    1. Disconnect the 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
      N91-1 (AM22) - Body ground Power switch off 11 to 14 V
      N92-7 (AM21) - Body ground Power switch off 11 to 14 V

    NG

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

    OK

  2. CHECK HARNESS AND CONNECTOR (GROUND)

    A01FSZZE13
    Text in Illustration
    *a

    Front view of wire harness connector

    (to Power Management Control ECU)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      N91-5 (E01) - Body ground Always Below 1 Ω
      N91-6 (E1) - Body ground Always Below 1 Ω
      N92-4 (E12) - Body ground Always Below 1 Ω
      N92-5 (E02) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Disconnect the N92 connector from the power management control ECU.

    2. Disconnect the 4A connector from the cowl side junction block RH.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      N92-1 (ACCD) - 4A-19 Always Below 1 Ω
      4A-4 - Body ground Always Below 1 Ω
      N92-1 (ACCD) or 4A-19 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK COWL SIDE JUNCTION BLOCK RH (RH-ACC RELAY)


    1. Remove the cowl side junction block RH.

      A01FU8TE02
      Text in Illustration
      *a

      Component without harness connected

      (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
      4E-1 - 4A-45 Auxiliary battery voltage not applied to terminals 4A-19 and 4A-4 10 kΩ or higher
      Auxiliary battery voltage applied to terminals 4A-19 and 4A-4 Below 1 Ω

    NG

    REPLACE COWL SIDE JUNCTION BLOCK RH

    OK

  5. INSPECT POWER MANAGEMENT CONTROL ECU

    A01FUK2E25
    Text in Illustration
    *a

    Component with harness connected

    (Power Management Control ECU)

    1. Reconnect the 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
      N92-1 (ACCD) - Body ground Power switch off → Power switch on (ACC) 1 V or less → 8.5 V or higher

    NG

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

    OK

    USE SIMULATION METHOD TO CHECK Click here