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Getting p0102, engine idles ok, no test drive.
Replace vacuums lines and mass sensor, put the scanner on it and won't detect the mass air flow going thru the sensor, reading 0
Clear code , check engine gone after restarting engine code comes right away. I will say electrical problem, I inspect the wires did not find any problem.
I can't get this problem solved, I look all the hoses and unplug all the connectors and plug it back, and nothing was disconnected. I check all the wires and test the mass air sensor wire to the big chunks of the wires going inside car, have continuity and check fuses again in the passenger glove box but I can't find the problem.
I did not have this code before, it came after hoses replacement.
I don’t think computer is bad, when working on the car battery was disconnected.
this is what I did:
crankcase vent valve hoses
valve cover gasket
upper throttle hoses and lower hoses
I spray fluid no difference!
When I hock up the snap on scanner won't read at all (0) the mass sensor, this is like it won't be there, if i unplug it or plug it there is no difference. Sounds like a electrical problem, if I clear the code when I restart the car comes on right a way.
Ok engine off I have 11.73 v on the battery w engine on I have 13.89v
White and red wires mass sesor wires w engine on 13.68v
Right now battery has over 12v I had doors open, but car cranks right up.
Forget to mention on the mass sensor wire I have
red with white stripe
I check black wire with yellow wire and has 4.6 ohms if this is what i need to do ? with engine on.
or how do I check the ohms ? with just one wire connected on the tester won't read nothing , do I use ground with the other wire from the tester?
w engine off
black wire mass sensor and ground the other leads set up the voltmeter to ohms 0.46 and going down to 0.00
w engine running black wire and ground reads
0.68 fluctuating up and down
w engine running yellow and ground reads
3.86 fluctuating up and down
battery has a voltage of 12.26 cranks the car up w no problem
I can charge the battery if this will make a diffrence, I don't have battery here to replace it , I can put a jump box to it?
i have two computers in the rear right under the hood
first one blue looking 3 connectors with wires
second computer black looking with 4 connectors
which computer and which connector ?
it is the computer with 4 connectors I track the wires they have continuity yellow wire and black wire.
pin#1 yellow wire I check w engine running and not running for voltage there is nothing , I check pin 1 with ground and also check between black and yellow is showing 0
pin#17 black wire w engine running has 2.48 ohms or w engine off has 0.07 fluctuating
if you look the post you where asking me to test white and red for voltage which what i did was testing yellow and red, there is no white;
you did not mention to test voltage on the black with yellow wire, only the ohms
However I check at the mass connector yellow and black and there is nothing ( 0 )voltage as well 0 at the computer connector.
But there is voltage on red with yellow 13.86v w engine running
pin#17 black wire w engine running has .78 ohms
on this one the voltmeter was set up higher sorry my fault on this.
2003 Jetta left rear window blue plastic part of the