With Scan Tool
ECU TERMINAL VALUES MEASUREMENT USING TOYOTA BREAK-OUT-BOX AND TOYOTA HAND-HELD TESTER(1) Hook up the TOYOTA hand-held tester and TOYOTA break-out-box to the vehicle.
(2) Read the ECU input/output values by following the prompts on the tester screen.
HINT: TOYOTA hand-held tester has a "Snapshot" function. This records the measured values and is effective in the diagnosis of intermittent problems.
Please refer to the TOYOTA hand-held tester/TOYOTA break-out-box operator's manual for further details.