ENTRY AND START SYSTEM, Diagnostic DTC:B2275

DTC Code DTC Name
B2275 STSW Monitor Malfunction

DESCRIPTION

This DTC is output when the engine start request signal circuit inside the main body ECU is open or shorted.

DTC Code Detection Condition Trouble Area
B2275 Engine start request signal circuit inside main body ECU or other related circuit is malfunctioning

  • Main body ECU

  • SFI system

  • Harness or connector

WIRING DIAGRAM

A01GKDBE01

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK WHETHER DTC OUTPUT RECURS


    1. Clear the DTCs Click here.

    2. Depress the brake pedal with the engine switch on (IG), wait at least 15 seconds, and check whether DTC B2275 recurs.

      Result
      Display (DTC output) Proceed to
      B2275 A
      No DTC output B

    B

    END (SYSTEM IS OK)

    A

  2. CHECK MAIN BODY ECU (STSW VOLTAGE)


    1. A01GJ1LE04

      Disconnect the A68 main body ECU connector.

    2. With the shift lever in P or N, depress the brake pedal fully.

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

      Tech Tips

      The voltage is generated at terminal STSW for 0.3 seconds when the engine cranks.

      Standard voltage
      Tester Connection Condition Specified Condition
      A68-4 (STSW) - Body ground When operating the engine switch to crank the engine. 11 to 14 V

    OK

    CHECK MAIN BODY ECU (OPERATION) Click here

    NG

  3. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - ECM)

    A01GI70E02

    1. Disconnect the A68 main body ECU connector.

    2. Disconnect the A14 ECM connector.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      A68-4 (STSW) - A14-27 (STSW) Always Below 1 Ω
      A68-4 (STSW) or A14-27 (STSW) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK MAIN BODY ECU (OPERATION)


    1. Temporarily replace the main body ECU with a new or normally functioning one.

    2. Check that the engine starts normally.

      OK
      Engine starts normally.

    NG

    GO TO SFI SYSTEM Click here

    OK

    END (SYSTEM IS OK)