Hot-Film Air Mass Sensor

Hot-film air mass sensor is non-adjustable. A faulty hot-film air mass sensor can make engine difficult to restart when engine is hot, engine starts then stalls, malfunction indicator light illuminated, or engine starts and runs only with accelerator pedal depressed. Hot-film air mass sensor can be tested with DISplus/GT1, DISplus/GT1 status page, and the DISplus/GT1 oscilloscope which requires taking the measurement with the ECM and the universal adapter connected to the circuit (engine running).

Visually inspect the sensor for damaged, missing or blocked screens. The screens affect air flow calibration. Also inspect sealing rings where sensor inserts in air filter housing and intake boot. Ensure pin connections are tight.