Toyota Corolla (E120): Ecu power source circuit

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Turn signal lever
Operating instructions 1 Right turn 2 Lane change to the right (move the lever partway and release it) The right hand signals will flash 3 times. 3 Lane change to the left (move the lever partway and release it) The left hand signals will flash 3 times. 4 Left turn ■Turn signals can b ...

Oxygen sensor monitor (front and rear o2s system)
Preconditions The monitor will not run unless: mil is off  drive pattern  connect the obd ii scan tool to the dlc3 to check monitor status and preconditions.  Start the engine and allow it to idle for 2 minutes or more.  Drive the vehicle at 25 mph ...

Circuit description
The ignition switch provides circuit power and the ecm provides the circuit ground that illuminates the mil. Mil operation is checked visually: it should be illuminated when the ignition is first turned on. If the mil is off all of the time or on all of the time, use the procedure below to ...