B2278

THEFT DETERRENT / KEYLESS ENTRY: SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Start Function): B2278: Engine Switch Circuit Malfunction
B2278 - Engine Switch Circuit Malfunction

DESCRIPTION

This DTC is stored 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 cable from the negative (-) battery terminal is connected, the power source mode becomes 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

HINT
Check the connector connection to the terminal to make sure that there is no abnormally such as a loose connection, deformations, etc.

PROCEDURE

1. READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

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

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Power Source Control / Data List.

(e) Read the Data List according to the display on the Techstream.

HINT
When using the Techstream with the engine switch off, turn on and off any of the door courtesy light switches repeatedly at 1.5 second intervals or less until communication between the Techstream and vehicle starts.

Power Source Control





OK:

ON (engine switch is pushed) and OFF (engine switch is not pushed) appear on the screen according to vehicle operating conditions.

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

2. CHECK FOR DTC

(a) Clear the DTC Smart Access System With Push-Button Start (for Start Function).

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

(c) Check for DTCs.

Result:





B -- REPLACE POWER SOURCE CONTROL ECU Removal

A -- USE SIMULATION METHOD TO CHECK How To Proceed With Troubleshooting

3. INSPECT ENGINE SWITCH

(a) Remove the engine switch (for 2GR-FSE: Removal, for 4GR-FSE: Removal).





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

Standard Resistance:





Text in Illustration





HINT
This engine switch is momentary type switch.

Result:





C -- REPLACE ENGINE SWITCH (for 4GR-FSE) Removal

B -- REPLACE ENGINE SWITCH (for 2GR-FSE) Removal
A -- Continue to next step.

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

(a) Disconnect the J55 connector from the power source control ECU.





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

Standard Resistance:





Text in Illustration





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CONTROL ECU - ENGINE SWITCH)

OK -- REPLACE POWER SOURCE CONTROL ECU Removal