Mass Airflow (MAF) Sensor
- Turn ignition switch to ON position. Without disconnecting MAF sensor connector, move connector seal for access to terminals. Turn ignition on. Using a DVOM with a minimum 10-megohm input impedance, backprobe between White and Red wire terminals of connector.
- If battery voltage is present, go to next step. If battery voltage is not present, check continuity of White and Red wire circuits between ECM and MAF sensor connector.
- Measure voltage between Black and Red wire terminals of MAF sensor connector. If voltage is not 0.2-0.8 volt, check continuity of Black and Red wire circuits between ECM and MAF sensor connector.
- Start engine. MAF sensor voltage signal should increase as engine RPM increases. If MAF sensor does not test as described, check MAF sensor connections. If connections are okay, replace MAF sensor.