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ENTRY AND START SYSTEM (for Start Function), 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 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.

Tip:

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
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WIRING DIAGRAM

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INSPECTION PROCEDURE

Note:

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

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PROCEDURE


  1. Click here

    CHECK HARNESS AND CONNECTOR (BATTERY - POWER MANAGEMENT CONTROL ECU)


    1. A01IUFQE04

      Disconnect the H71 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
      H71-2 (AM21) - Body ground Always 9.5 to 16 V
      H71-1 (AM22) - Body ground
      Table 1. Text in Illustration
      *1

      Rear view of wire harness connector

      (to Power Management Control ECU)

  2. Click here

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


    1. Disconnect the H71 power management control ECU connector.

    2. A01IUFQE05

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H71-6 (GND) - Body ground Always Below 1 Ω
      H71-5 (GND2) - Body ground
      Table 2. Text in Illustration
      *1

      Rear view of wire harness connector

      (to Power Management Control ECU)

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


    1. A01IUHVE02

      Disconnect the H71 power management control ECU and DM instrument panel junction block assembly connectors.

      Table 3. 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
      H71-19 (ACCD) - DM-7 20°C (68°F) 75 to 117 Ω
      H71-19 (ACCD) - Body ground Always 10 kΩ or higher

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    INSPECT ACC RELAY


    1. A01IN8WE02

      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

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    CHECK POWER MANAGEMENT CONTROL ECU


    1. A01IUO1E11

      Connect the power management control ECU connector.

      Table 4. 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
      H71-19 (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
      Table 5. Result
      Result Proceed to
      OK A
      NG (for LHD) B
      NG (for RHD) C

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    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 wire harness or connector.


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    CHECK POWER MANAGEMENT CONTROL ECU


    1. A01IUO1E11

      Connect the power management control ECU connector.

      Table 6. 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
      H71-19 (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
      Table 7. Result
      Result Proceed to
      OK A
      NG (for LHD) B
      NG (for RHD) C

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    REPAIR OR REPLACE HARNESS OR CONNECTOR

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    REPAIR OR REPLACE HARNESS OR CONNECTOR

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    USE SIMULATION METHOD TO CHECKClick here

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    REPLACE POWER MANAGEMENT CONTROL ECUClick here

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    REPLACE POWER MANAGEMENT CONTROL ECUClick here

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    END