MAF question
Posted: Mon Nov 10, 2003 3:24 am
What's the difference between an AT maf sensor and an MT maf sensor?
Depends on the year and whether or not the car is a turbo.
There are 2 types of sensors: a Hitachi hot-wire sensor with an aluminum body, part number 22680AA170, and a JECS hot-film sensor with a black plastic body, part number 22680AA160.
1990 MTs and all 1991-1994 turbos had the Hitachi sensor. All non-turbo ATs had the JECS sensor.
The Hitachi sensor has a fifth pin that's not used on the JECS sensor. I believe this sensor supplies a 5-volt reference voltage from the ECU but do not know for certain.
Other than the fifth pin and the hot-wire vs. hot-film issue, I don't know what differences there are. I do believe they both have the same transfer function.