Mass Airflow Sensor: Rio

Warm up engine to normal operating temperature and let idle. Backprobe and measure voltage between MAF sensor connector terminal No. 2 (Green/Blue wire) and ground. At idle, voltage should be .6-.8 volts. When engine is accelerated, voltage should be about 1.0 volts at 2000 RPM. If voltage is not as specified, replace MAF sensor.