B2278

THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function): B2278: Engine Switch Circuit Malfunction

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.






WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. READ VALUE USING TECHSTREAM (START SWITCH 1, 2)
(a) Use the Data List to check if the engine switch is functioning properly.

Main Body





OK:
When the engine switch is turned on (IG), ON is displayed on the Techstream.
NG -- INSPECT ENGINE SWITCH
OK -- Continue to next step.
2. CHECK WHETHER DTC OUTPUT RECURS
(a) Clear the DTCs. Smart Key System
(b) Turn the engine switch on (IG), and check whether DTC B2278 is output.

Result





B -- REPLACE MAIN BODY ECU
A -- USE SIMULATION METHOD TO CHECK
3. INSPECT ENGINE SWITCH





(a) Disconnect the E18 engine switch connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:






NG -- REPLACE ENGINE SWITCH
OK -- Continue to next step.
4. CHECK HARNESS AND CONNECTOR (ENGINE SWITCH - MAIN BODY ECU AND BODY GROUND)





(a) Disconnect the E1 main body ECU connector.
(b) Disconnect the E18 engine switch connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE MAIN BODY ECU