Re: DTC 48 (Mass Air flow Sensor Circuit) Slight rough idle, car cuts out. HELP!
Subject: Re: DTC 48 (Mass Air flow Sensor Circuit) Slight rough idle, car cuts out. HELP! by Jeffvette on 2010/2/14 5:04:54
Quote:
Acedraven wrote:
3. Measure voltage between harness connector terminals B and C Should be B + Is it? Here is a question, I'm assuming that means it should have a positive volt? If so, no it has like -.19 volts.
4. Measure volt between terminal C and chassis ground, should be B+ (same as above)
No B+ means the signal should be the same as the current battery voltage.
Quote:
So my options are
Open ignition feed circuit to MAF sensor (i believe this is it) or Open ground circuit to MAF sensor.
Now I'm not really sure where to go from here. I tried looking for a circuit diagram so i can find out where the ground is for the 339 circuit and am not having much luck. Also tried looking in the ignition section. I am basically not having much luck trying to locate where in the shop manual i need to go next.
You will not find the ground for wire 339 as that is the power wire. It joins back in at S115 with the EVAP, EGR Solenoid, TPS interface module and the CAGS 2-3 blockout (if equipped)
The ground is Number 108 and it is at the passenger side front head.
My suggestion is to repin the harness and create a new power feed and a new ground. And see if the car runs correctly. The yellow wire is the signal wire going to the PCM.
