[Z06] No power to MAF
#1
No power to MAF
Just started the car for the first time after a 3.5 year build and now the MAF isn’t getting any Hz. Any ideas what could be the issue? Swapped the MAF with another one and still no power. IAT is working though. Any help or ideas would be appreciated.. thanks!
#2
Moderator, Tech Contributor
Member Since: Sep 2013
Location: Cape Coral, Florida
Posts: 9,609
Received 2,147 Likes
on
1,712 Posts
Without even looking at a wiring schematic MAF sensors use 3 wires…a 12 volt feed (pink), a signal (yellow), and a black or black/white ground…the power is normally fed through an emissions fuse and that fuse is usually powered by a powertrain ignition relay…with the engine running do you see 12 volts on the pink wire ??…with a 12 volt test light connected to B+ does the test light illuminate when probing the ground wire ??…do you see a 5 volt reference voltage on the yellow ??
The following users liked this post:
NathanErcse (04-29-2024)
#3
Without even looking at a wiring schematic MAF sensors use 3 wires…a 12 volt feed (pink), a signal (yellow), and a black or black/white ground…the power is normally fed through an emissions fuse and that fuse is usually powered by a powertrain ignition relay…with the engine running do you see 12 volts on the pink wire ??…with a 12 volt test light connected to B+ does the test light illuminate when probing the ground wire ??…do you see a 5 volt reference voltage on the yellow ??
I saw a read up of this but my voltmeter isn’t reading anything. Would it pick up power by just touching the wires? Or I have to get metal contact to the actual wire?
#5
Moderator, Tech Contributor
Member Since: Sep 2013
Location: Cape Coral, Florida
Posts: 9,609
Received 2,147 Likes
on
1,712 Posts
The following users liked this post:
NathanErcse (04-29-2024)
#6
Moderator, Tech Contributor
Member Since: Sep 2013
Location: Cape Coral, Florida
Posts: 9,609
Received 2,147 Likes
on
1,712 Posts
You DON’T want to have this kind of stuff tapped into the emissions fuse !!…BAD BAD IDEA !!…remove it and retest !!
The following users liked this post:
NathanErcse (04-29-2024)
#7
Yeah that was my issue.
G speed specifically says to use that fuse area for the oil cooler thermostat. I’ll ask them where else I can plug it into because that’s not gonna work. Thanks for mentioning the emissions!
G speed specifically says to use that fuse area for the oil cooler thermostat. I’ll ask them where else I can plug it into because that’s not gonna work. Thanks for mentioning the emissions!
The following users liked this post:
C5 Diag (04-28-2024)
#8
Moderator, Tech Contributor
Member Since: Sep 2013
Location: Cape Coral, Florida
Posts: 9,609
Received 2,147 Likes
on
1,712 Posts
On my 2008 you can see that the fuse 14 power splits off and feeds the MAF sensor and also the EVAP Purge Valve…so now you have 3 components drawing power from the fuse.
The following users liked this post:
NathanErcse (04-29-2024)
#9
#10
Moderator, Tech Contributor
Member Since: Sep 2013
Location: Cape Coral, Florida
Posts: 9,609
Received 2,147 Likes
on
1,712 Posts
The following users liked this post:
NathanErcse (04-29-2024)
#13