have a td4 here and when the maf output is measured on the multimeter,voltage, it appears to read correctly. 2.1v tickover rising on acceleration. when the airflow data is monitored on a delphi 150 diagnostic system the reported airflow rate doesnt folow what the meter is showing it staggers behind a lot. voltage measurement taken at ecu pins to rule out any wiring errors. now im going by some data from tunning diesels and i was wondering if anyone had the data that relates voltage to airflow reading. i am starting to suspect an internal error with the ecu as the previous sensor showed reduced airflow on first acceleration on the delphi and was changed. i am waiting for a genuine maf sensor but as i say the voltage readings read ok.