B2278

4GR-FSE STARTING: SMART ACCESS SYSTEM WITH PUSH-BUTTON START: B2278: Engine Switch Circuit Malfunction
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.

HINT
When the power source control ECU is replaced with a new one and the negative (-) battery terminal is connected, the power source mode becomes the IG-ON mode. When the battery is removed and reinstalled, the power source mode that was selected when the battery was removed is restored.





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK CONNECTORS

(a) Check that the connectors are securely connected and the terminals are not deformed or loose.

OK:

The connectors are securely connected and the terminals are not deformed or loose.

NG -- REPAIR OR REPLACE CONNECTORS
OK -- Continue to next step.

2. CHECK HARNESS AND CONNECTOR (POWER SOURCE CONTROL ECU -BODY GROUND)

(a) Disconnect the J55 ECU connector.





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

Standard resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

3. INSPECT ENGINE SWITCH

(a) Remove the engine switch.





(b) Disconnect the switch connector.

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

Standard resistance:





HINT
This switch is a momentary type switch.

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

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

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





Standard resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

5. READ VALUE USING TECHSTREAM (START SWITCH 1 AND 2)

(a) Reconnect the connectors.

(b) Connect Techstream to the DLC3.

(c) Turn the engine switch on (IG).

(d) Check the DATA LIST for proper functioning of the start switches 1 and 2.

Body:





OK:

ON (engine switch on (IG)) and OFF (engine switch off) appear on the screen.

NG -- REPLACE POWER SOURCE CONTROL ECU
OK -- Continue to next step.

6. RECHECK FOR DTC

(a) Delete the DTCs Reading and Clearing Diagnostic Trouble Codes.

(b) Check for DTCs again.

OK:

DTC B2278 is not output.

NG -- REPLACE POWER SOURCE CONTROL ECU

OK -- CHECK INTERMITTENT PROBLEMS