MAF reading 100% on my safc and not starting??

[meet07]

Im sure its something simple but I wired up a N62 Maf from a 300zx this afternoon. When I went to turn the key ignition on to setup the sensor number i noticed the af percentage was 100. I looked at the volts coming into the SAFC they read 5.11(maxed out) Well I took it back to my freind to get a refund assuming that 100% when the car wasnt even running meant bad maf. He hooked it up to his ca18 powered 200sx(blow through) and she crunk right up?? So im assuming that I have my wiring wrong

Do I have the wires hooked up wrong like maybe the 12v power is swicthed with the siganl??

I used this diagram for the instal.http://paulr33.skylinesaustral....html

I double checked the continuity on all the wires to the ecu and chassis grounds. 12v power good and all....


Modified by meet07 at 2:54 AM 3/9/2010

[Kevin.A]

So your getting voltage when the ignition is on, but the car is not running?if you disconnect the connector do you still get voltage?

Kevin A

[meet07]

I also found this:http://jimwolftechnology.com/w...S.PDF

Ill be double checking my wiring this afternoon...
Modified by meet07 at 2:45 PM 3/6/2010

[meet07]

So your getting voltage when the ignition is on, but the car is not running?if you disconnect the connector do you still get voltage?

Kevin A

Yes kevin.....5.11 volts with the key one..The wirng is good??

[eh?]

Are your grounds good?

[Kevin.A]

Yes kevin.....5.11 volts with the key one..The wirng is good??

If I'm understanding you correctly, your getting 5.11 volts on the signal voltage even after you disconnectg the maf?

Double check your grounds and trace the signal wire to your ecu. It shouldn't be connected or spliced into anything else

Kevin a

[meet07]

If I'm understanding you correctly, your getting 5.11 volts on the signal voltage even after you disconnectg the maf?

Double check your grounds and trace the signal wire to your ecu. It shouldn't be connected or spliced into anything else

Kevin a

I have already checked the continuity on all 5 wires. The ground wire to the engine block was good. I have check both wires that goes from the pigtail to the ecu(pins 26 and 27) Im getting 12v from the power wire.

I was changing the the hotwire settings seeing if I could get something diffrent. I then looked over the safc connections. I accidently pulled the yellow safc wire out of the quick connector but quickly added a new on in its place. I tryed to see if the car would crank but the battery didnt have enough juice. I hooked the cables up to my jeep for like 15 minutes. Sometime during me checking connections and after me charging the battery I realized that the safc screen out of the blue was reading 0.01 %I looked at the actual voltage and it read .5volts....With the key on without the car running the RB25FSM states that the voltage is suppose to be .3 volts So i knew when I crunk up the car that it woul be on the rich side. Started the car and I was right... I ended up removing like 30% at idle. I cut the car off to change the rear shocks/springs b/c I had planned on going to the track tomm. The car would not start afterwards...

Im bad at telling stories so please bare with me...
Modified by meet07 at 2:44 PM 3/6/2010

[meet07]

If I'm understanding you correctly, your getting 5.11 volts on the signal voltage even after you disconnectg the maf?

Double check your grounds and trace the signal wire to your ecu. It shouldn't be connected or spliced into anything else

Kevin a

I figured that maybe the battery ground or batterty to chassis ground was dirty so I cleaned those. but still nothing.

How can the n62 read full voltage with only the key on?? Its suppose to read 0.3?? Isnt the sensor bad..
Modified by meet07 at 2:24 AM 3/8/2010

[meet07]

Just in case people are keeping up with this here is the update:

Yesterday I wanted to play with the wiring on the z32 maf pigtail to harness. I desoldered the signal grnd wire with the SAFC screen on. It still read 5.11 volts. I then touched the signal grnd to the chassis grnd....nothing. So I decided to check the continuity from the plug to pin 27 on the ecu. I didnt get anything. So im thinking thats b/c the signal grnd was disconnected. So I soldered the signal grnd connection back together. After that the maf was reading .5 volts. Thats a little higher than what it is suppose to be but oh well...thats better than 5.11 volts.

So excited I decided to take her for a spin. I drove it hard for about 25 minutes and tuned her up. Got back home and messed with my suspension.

a few hours later I wanted to get me a drink. Well on the way to the ABC store I ran across a mustang. we played for a little bit and when I got to the stop light I noticed the 240 was putting out black smoke and the idle was surging.....I proceded to move forward when the light turned green but she cut off on me....AF was peggeg out at 9.0 obviously....the maf did it again.

Police officer helped me push the car off to the side. With the key on I unplugged the maf and wacthed the signal voltage drop off to about 0.2 volts or so. I pluged it back up and its putting out 0.6 instead of the 5.11???

What the heck??

the plug that came with the pig tail doesnt have the little clip that holds it into place but I ziptied it so it would come unpluged. Maybe the little female connections in the pigtail needs to be pressed in to make a better contact????

[meet07]

Bad maf...I returned the old one and got anouther from a good source. Solved the issues..