Toyota 2GR-FE Manual page 944

ST–82
2GR-FE STARTING – SMART KEY SYSTEM
4
CHECK MAIN BODY ECU OPERATION
(a) After replacing the main body ECU with a normally
functioning ECU, check that the engine starts (See page
ST-30).
OK:
Engine can start normally.
NG
REPLACE STEERING LOCK ECU
OK
END (MAIN BODY ECU DEFECTIVE)
ST