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PUSH-BUTTON START, Diagnostic DTC:B2274

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DTC Code DTC Name
B2274 ACC Monitor Malfunction
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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.

DTC No. Detection Item DTC Detection Condition Trouble Area Note
B2274 ACC Monitor Malfunction

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

Tip:

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

  • AM2 fuse

  • Instrument panel junction block assembly

  • Power management control ECU

  • Wire harness or connector
  • DTC Output Confirmation Operation:

  • 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.

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 ACC 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 ACC relay being stuck off, the ACC relay does not turn on even though the power switch is on (ACC).

Tip:

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

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Table 2. Related Data List and Active Test Items
DTC No. Data List and Active Test
B2274
  • Power Source Control

  • ACC Relay Monitor
Table 3. *a from Auxiliary Battery *b Instrument Panel Junction Block Assembly *c Power Management Control ECU
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WIRING DIAGRAM

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CAUTION / NOTICE / HINT

Note:

  • When using the GTS with the power 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 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 push-button start uses the LIN communication system and CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the push-button start after confirming that the communication systems are functioning properly.

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  • Before replacing the power management control ECU, refer to push-button start Precaution.

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

  • After repair, confirm that no DTCs are output by performing "DTC Output Confirmation Operation".

Tip:

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.

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PROCEDURE


  1. Click here

    CHECK HARNESS AND CONNECTOR (POWER SOURCE)

    Result
    Proceed to
    OK
    NG

    1. A01MSOUC16
      *a

      Front view of wire harness connector

      (to Power Management Control ECU)

      Disconnect the K32 and K33 power management control ECU connectors.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      K32-1 (AM22) - Body ground Power switch off 11 to 14 V
      K33-7 (AM21) - Body ground Power switch off 11 to 14 V
      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

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

  2. Click here

    CHECK HARNESS AND CONNECTOR (GROUND)

    Result
    Proceed to
    OK
    NG

    1. Disconnect the K32 and K33 power management control ECU connectors.

    2. A01MSOUC17
      *a

      Front 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
      K32-5 (E01) - Body ground Always Below 1 Ω
      K32-6 (E1) - Body ground Always Below 1 Ω
      K33-4 (E12) - Body ground Always Below 1 Ω
      K33-5 (E02) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  3. Click here

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


    1. Disconnect the K33 power management control ECU connector.

    2. Disconnect the 4B 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
      K33-1 (ACCD) - 4B-19 Always Below 1 Ω
      4B-7 - Body ground Always Below 1 Ω
      K33-1 (ACCD) or 4B-19 - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  4. Click here

    CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (ACC RELAY)


    1. Remove the instrument panel junction block assembly.

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    2. A00222RC01
      *a

      Component without harness connected

      (Instrument Panel Junction Block Assembly)

      		 - -

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      4B-19 - 4B-7 20°C (68°F) 130.92 to 190.74 Ω
      4E-1 - 4C-20 Auxiliary battery voltage not applied to terminals 4B-19 and 4B-7 10 kΩ or higher
      Auxiliary battery voltage applied to terminals 4B-19 and 4B-7 Below 1 Ω
      Result
      Proceed to
      OK
      NG

  5. Click here

    CHECK POWER MANAGEMENT CONTROL ECU


    1. A0022A2C45
      *a

      Component with harness connected

      (Power Management Control ECU)

      Reconnect the K32 and K33 power management control ECU connectors.

    2. Install the instrument panel junction block assembly.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      K33-1 (ACCD) - Body ground Power switch off → Power switch on (ACC) 1 V or less → 8.5 V or higher
      Result
      Proceed to
      OK
      NG

    • OK

      END (TEMPORARY CONNECTION FAILURE IS SUSPECTED)Click here

    • NG

      REPLACE POWER MANAGEMENT CONTROL ECUClick here