ECU Terminal Values Measurement
ECU TERMINAL VALUES MEASUREMENT BY USING BREAK-OUT-BOX AND HAND-HELD TESTERa. Hook up the break-out-box and hand-held tester to the vehicle.
b. Read the ECU input/output values by following the prompts on the tester screen.
c. Please refer to the hand-held tester has a "Snapshot" function. This records the measured data and is effective in the diagnosis of intermittent problems.