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SMART ENTRY AND START SYSTEM (for Start Function), Diagnostic DTC:B2275

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DTC Code DTC Name
B2275 STSW Monitor Malfunction
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DESCRIPTION

This DTC is stored when there is an open, short, or any other problem in the engine start request output circuit inside the main body ECU or in the external circuit.

Tip:

When the main body ECU is replaced with a new one and the cable from the negative (-) battery terminal is connected, the power source mode becomes 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
B2275 The ST output circuit (engine starting request signal circuit) inside the main body ECU or other related circuit is malfunctioning

  • Main body ECU

  • ECM

  • Wire harness or connector
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WIRING DIAGRAM

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INSPECTION PROCEDURE

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PROCEDURE


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    CHECK FOR DTC


    1. Clear the DTCs (Click here).

    2. Turn the engine switch on (IG).

    3. After 15 seconds have elapsed, recheck for DTCs and check if the same DTC is output.

      OK
      DTC B2275 is not output.

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    CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - ECM)


    1. Disconnect the G51 connector from the main body ECU.

    2. Disconnect the A8 connector from the ECM.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G51-4 (STSW) - A8-14 (STSW) Always Below 1 Ω
      G51-4 (STSW) - Body ground Always 10 kΩ or higher

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    CHECK MAIN BODY ECU


    1. A01CDHYE04

      Reconnect the G51 connector to the main body ECU.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      G51-4 (STSW) - Body ground Brake pedal depressed, Engine switch hold on (ST) Voltage at STSW is within 2 V of the voltage measured at AM1 or AM2*.
      Table 1. Text in Illustration
      *1

      Component with harness connected

      (Main Body ECU)
      Tip:

      *: A maximum voltage drop of 2 V across the main body ECU is permitted.

      Result
      Result Proceed to
      OK (for 2GR-FE) A
      OK (for 2AZ-FE) B
      NG C

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    USE SIMULATION METHOD TO CHECKClick here

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    REPAIR OR REPLACE HARNESS OR CONNECTOR (MAIN BODY ECU - ECM)

  6. Click here

    REPLACE ECM (for 2AZ-FE)Click here

  7. Click here

    REPLACE MAIN BODY ECUClick here

  8. Click here

    REPLACE ECM (for 2GR-FE)Click here