B2278

2GR-FSE STARTING: SMART ACCESS SYSTEM WITH PUSH-BUTTON START: B2278: Engine Switch Circuit Malfunction

DTC B2278 - Engine Switch Circuit Malfunction

DESCRIPTION

This DTC is output when 1) a malfunction is detected between the power source control 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 and 2)
(a) Check the DATA LIST for proper functioning of the start switch 1 and 2.

Power source control ECU





OK:
ON (engine switch on (IG)) appears on the screen.
NG -- INSPECT ENGINE SWITCH
OK -- REPLACE POWER SOURCE CONTROL ECU
2. INSPECT ENGINE SWITCH




(a) Remove the engine switch.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- REPLACE ENGINE SWITCH
OK -- Continue to next step.

3. CHECK WIRE HARNESS (ENGINE SWITCH - POWER SOURCE CONTROL ECU AND BODY GROUND)




(a) Disconnect the K29 switch connector.
(b) Disconnect the K73 ECU connector.
(c) Measure the resistance of the wire harness side connectors.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- REPLACE POWER SOURCE CONTROL ECU