Used to confirm the spark has occurred. You should see a voltage pulse while the engine is idling. Idle Air Control Valve (A2):

If you are preparing to probe your 2NZ-FE ECU with a multimeter, keep these safety rules in mind to avoid frying your expensive control module:

2nz Fe Ecu Pinout Pdf 186 Portable

Used to confirm the spark has occurred. You should see a voltage pulse while the engine is idling. Idle Air Control Valve (A2):

If you are preparing to probe your 2NZ-FE ECU with a multimeter, keep these safety rules in mind to avoid frying your expensive control module: 2nz fe ecu pinout pdf 186 portable