DTC    B2278    Engine Switch Circuit Malfunction

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DESCRIPTION

This DTC is output when: 1) a malfunction is detected between the main body ECU and the engine switch; or 2) either of the switches inside the engine switch is malfunctioning.

DTC Code
Detection Condition
Trouble Area
B2278
Communication is abnormal between main body ECU and engine switch or engine switch is defective
  1. Main body ECU
  2. Engine switch
  3. Wire harness or connector

WIRING DIAGRAM


A149376E01


INSPECTION PROCEDURE

1.READ VALUE OF INTELLIGENT TESTER (START SWITCH 1 AND 2)

  1. Use the Data List to check if the engine switch is functioning properly.

    Main body ECU 
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    Start Switch 1
    		Start Switch 1/ON or OFF
    		ON: Engine switch on (IG)
    OFF: Engine switch off
    		-
    Start Switch 2
    		Start Switch 2/ON or OFF
    		ON: Engine switch on (IG)
    OFF: Engine switch off
    		-

OK:
ON appears on the screen.



NG
Перейдите к шагу 3
OK


2.CHECK ENGINE SWITCH (SWITCH CONDITION)

  1. Ensure the key is inside the cabin.

  1. Check that the power source mode changes as shown below each time the engine switch is pushed.

    OK:
    off → on (ACC) → on (IG) → off



NG
GO TO POWER SOURCE MODE DOES NOT CHANGE (Нажмите здесь)
OK

SYSTEM IS OK 

3.INSPECT ENGINE SWITCH
A150029E01

  1. Remove the engine switch.

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

    Standard resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    7 (SS1) - 5 (GND)
    		Pushed
    		Below 1 Ω
    2 (SS2) - 5 (GND)
    		Pushed
    		Below 1 Ω
    7 (SS1) - 5 (GND)
    		Not pushed
    		10 kΩ or higher
    2 (SS2) - 5 (GND)
    		Not pushed
    		10 kΩ or higher



NG
REPLACE ENGINE SWITCH
OK


4.CHECK HARNESS AND CONNECTOR (ENGINE SWITCH - MAIN BODY ECU AND BODY GROUND)

A150033E01

  1. Disconnect the L36 engine switch connector.

  1. Disconnect the L13 main body ECU connector.

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

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    L36-7 (SS1) - L13-17 (SSW1)
    		Always
    		Below 1 Ω
    L36-2 (SS2) - L13-16 (SSW2)
    		Always
    		Below 1 Ω
    L36-5 (GND) - Body ground
    		Always
    		Below 1 Ω
    L36-7 (SS1) or L13-17 (SSW1) - Body ground
    		Always
    		10 kΩ or higher
    L36-2 (SS2) or L13-16 (SSW2) - Body ground
    		Always
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE MAIN BODY ECU