Okay i did some analysis on this and read the voltages out of the MAF sensor.
What i did was took a 12v multimeter and accesses the 5 wires and read voltage. I did four tests. My theory is the Scanner tool is an easy way to access readings across the different systems of the car. However they all originate at the sensors.
1. With car off.
2. Car off ignition on
3. Car on.
There are five wires connected to the MAF. In order from left to right looking from above.
1. White/Red - this one is the battery wire.
2. Black/White – I think this one is a ground – no volts
3. Green/black – This one gets voltage when engine is running
4. Blue/white – This one gets voltage when ignition on/engine off and ignition on/engine on
5. Orange – This one is a ground or something else – no volts
First test was no ignition/ engine off.
None of the wires measured any voltage.
Second test was ignition on/engine off.
The white/red got around 12 volts, since ignition is on and sensor is getting battery power.
Blue/white got 2.87 Volts. I think this is out of the sensor but maybe not, either way it has power when ignition is on.
All others 0 volts.
Third test is ignition on/ engine on. This one I started when the car was cold and took measurements as it warmed up. I did this since the car seems to work better at different temperatures, with being warm the worst.
White/red got 14.2 volts. Higher now since it has access to running alternator.
Black/white still got 0 volts
Green was very strange. It started at 1.54 volts, as the temp of the engine heated up its volts dropped steadily. Last reading with engine up to mid-range on gauge which is warm was 1.2 volts.
Blue/white was at 2.85 and dropped to 2.73 when temp was warm.
Orange was .02 volts during this test.
Strange thing I also noticed was with key on:
Blue/white 5 volts when not connected to the sensor reading voltage from wire.
Blue/white 2.87 connected
Blue/white 2.5 connected after running to warm temp
Green/Black 0 volts unconnected when reading from wire
Green/Black .73 volts connected to sensor
Green/Black .73 connected to sensor after running to warm.
Does this kinda analysis make any sense to anyone? Anyone think something might be up with these readings?
Thanks!