Dtc B2278 Engine Switch Circuit Malfunction

Vehicle Interior. Land Cruiser. Urj200, 202 Grj200 Vdj200
Theft Deterrent Keyless Entry. Land Cruiser. Urj200, 202 Grj200 Vdj200

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE USING INTELLIGENT TESTER (START SWITCH 1, 2)

CHECK WHETHER DTC OUTPUT RECURS

INSPECT ENGINE SWITCH

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

DTC B2278 Engine Switch Circuit Malfunction


DESCRIPTION

This DTC is stored 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 the main body ECU and engine switch or the engine switch is defective.
  1. Main body ECU
  2. Engine switch
  3. Harness or connector

WIRING DIAGRAM


Land Cruiser. Urj200, 202 Grj200 Vdj200.Theft Deterrent Keyless Entry.Entry And Start System (For Entry Function). Dtc B2278 Engine Switch Circuit Malfunction


INSPECTION PROCEDURE

1.READ VALUE USING INTELLIGENT TESTER (START SWITCH 1, 2)

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

    Main Body
    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:
    When the engine switch is turned on (IG), ON is displayed on the intelligent tester.


NG
Go to step 3
OK


2.CHECK WHETHER DTC OUTPUT RECURS

  1. Clear the DTCs (Click here).

  1. Turn the engine switch on (IG), and check whether DTC B2278 is output.

    Result
    Result
    		Proceed to
    No DTC output
    		A
    DTC B2278 output
    		B


B
REPLACE MAIN BODY ECU
A

USE SIMULATION METHOD TO CHECK (Click here)

3.INSPECT ENGINE SWITCH
Land Cruiser. Urj200, 202 Grj200 Vdj200.Theft Deterrent Keyless Entry.Entry And Start System (For Entry Function). Dtc B2278 Engine Switch Circuit Malfunction

  1. Disconnect the E18 engine switch connector.

  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
    Result
    Result
    		Proceed to
    Within specified range
    		A
    Outside specified range (for 1GR-FE)
    		B
    Outside specified range (for 1UR-FE)
    		C
    Outside specified range (for 3UR-FE)
    		D
    Outside specified range (for 1VD-FTV)
    		E


B
REPLACE ENGINE SWITCH (Click here)

C
REPLACE ENGINE SWITCH (Click here)

D
REPLACE ENGINE SWITCH (Click here)

E
REPLACE ENGINE SWITCH (Click here)
A


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

Land Cruiser. Urj200, 202 Grj200 Vdj200.Theft Deterrent Keyless Entry.Entry And Start System (For Entry Function). Dtc B2278 Engine Switch Circuit Malfunction

  1. Disconnect the E1 main body ECU connector.

  1. Disconnect the E18 engine switch connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    E1-17 (SSW1) - E18-7 (SS1)
    		Always
    		Below 1 Ω
    E1-16 (SSW2) - E18-2 (SS2)
    		Always
    		Below 1 Ω
    E18-5 (GND) - Body ground
    		Always
    		Below 1 Ω
    E1-17 (SSW1) or E18-7 (SS1) - Body ground
    		Always
    		10 kΩ or higher
    E1-16 (SSW2) or E18-2 (SS2) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE MAIN BODY ECU