# Wiring MAF On Sr S13

**URL:** <https://forums.speedlife.net/t/wiring-maf-on-sr-s13/81767>\
**Category:** SON240sx Automotive\
**Created:** [October 12, 2004, 9:32pm UTC](https://forums.speedlife.net/t/wiring-maf-on-sr-s13/81767 "2004-10-12T21:32:11Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![DETS14](https://avatars.discourse-cdn.com/v4/letter/d/ee59a6/32.png) [@DETS14](https://forums.speedlife.net/u/DETS14)\
**Post date:** [October 12, 2004, 9:32pm UTC](https://forums.speedlife.net/t/wiring-maf-on-sr-s13/81767/1 "2004-10-12T21:32:11Z")

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Im rewiring my mass air flow sensor, and Im using a multimeter to measure voltage and discover which of the three wires is power/ ground/ signal. Does the ecu have to be in to be reading a voltage? When I read voltage it gives nothing or very small amounts like 120 mv. Also, the car is in the On position, but not started. Any help would be awesome, thanks.