sleepy_boy1

so when i bought the engine a the harness, i noticed that the maf plug was missing, so i bought a new maf with a pigtail, my maf has 5 wires, tan, yellow, pink black and blk/wht, but my harness has like 4tan wires and twoblack and two pink wires.... my maf has a iat sensor in it so what are these extra wires for? any ideas?

the_merv

iTrader: (88)

What Harness do you have that has all the extra wires?

I wired my 85mm MAF into my LS1 Harness, and all the wiring was inplace.

sleepy_boy1

its the stock harness, from a 2004 subarban same as engine

Pocket

iTrader: (22)

Youll have to check each wires placement at the PCM connector to identify them

IAT Hi/Lo are PCM controlled, as well as MAF signal
MAF 12v is usually shared with the PCM IGN fuse
MAF grd can be grounded anywhere

sleepy_boy1

one of the tan wires is for IAT sensor the others are

25 TAN 1671 HO2S Low Signal - Bank 2 Sensor 2
26 TAN 1667 HO2S Low Signal - Bank 2 Sensor 1
3 TAN 1465 Fuel Pump Relay Control - Secondary (Dual Tanks)
25 TAN 472 IAT Sensor Signal


are 1671 and 1667 some kind of sensors? what do they look like?

techrunner

iTrader: (4)

yeah, ho2s is your oxygen sensors. there were 4 total, usually the rear 2 are deleted though, in the pcm and also removed from the harness. get a continuity tester and check the pins at the pcm and you'll be able to id all those wires without tracing them all out physically.

digitalfiend

Bear with me for a little bit of thread revival...

I'm in a similar situation to the one you were in. I have a MAF, but no pigtail for it and I need to figure out where to wire it into the wiring harness. I can probably figure out the wiring from this thread and some other pinout data I've seen, but I still need a MAF pigtail. Where did you buy yours from and how much did it cost you?