DTC    B2275    STSW Monitor Malfunction

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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
  1. Main body ECU
  1. SFI system
  1. Wire harness or connector

WIRING DIAGRAM


A149375E01


INSPECTION PROCEDURE

1.CHECK WHETHER DTC OUTPUT RECURS

  1. Clear the DTCs.

  1. 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 (MAIN BODY ECU IS FAULTY)
A


2.CHECK MAIN BODY ECU (STSW VOLTAGE)


    A135935E04

  1. Disconnect the A68 main body ECU connector.

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

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

    УКАЗАНИЕ:
    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
Перейдите к шагу 4
NG


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

A150031E01

  1. Disconnect the A68 main body ECU connector.

  1. Disconnect the A14 ECM connector.

  1. 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.

  1. Check that the engine starts normally.

    OK:
    Engine starts normally.



NG
GO TO SFI SYSTEM (Нажмите здесь)
OK

END (MAIN BODY ECU IS FAULTY)