Advice needed for H48 Trouble Code
Thread Starter
Burning Brakes
Joined: Jul 2007
Posts: 751
Likes: 0
From: Eau Claire Wisconsin
Advice needed for H48 Trouble Code
Added a transmission cooler yesterday, I removed the air intake assy
along with the MAF. All went smooth, but when startting it back up I
had the check engine light on and the cooling fans run all the time.
Checked the codes today and came up with an H48 (MAF Problem) I
had this happen before when I replaced the cam. My friend hooked up
his Snap-on scroll scanner and saw the values for the MAF where
through the roof, he reset it through the scanner and it never cam
back. I tried to reset it by disconnecting the neg on the battery, but it
did nothing and came back on 3 seconds after starting. Replaced the
MAF with a rebuilt A1 from the autoparts store and the light was still
on. I am stumped at this point, any advice would be appreciated!
along with the MAF. All went smooth, but when startting it back up I
had the check engine light on and the cooling fans run all the time.
Checked the codes today and came up with an H48 (MAF Problem) I
had this happen before when I replaced the cam. My friend hooked up
his Snap-on scroll scanner and saw the values for the MAF where
through the roof, he reset it through the scanner and it never cam
back. I tried to reset it by disconnecting the neg on the battery, but it
did nothing and came back on 3 seconds after starting. Replaced the
MAF with a rebuilt A1 from the autoparts store and the light was still
on. I am stumped at this point, any advice would be appreciated!
Drifting
Joined: Sep 2003
Posts: 1,363
Likes: 7
From: 1994 LT1 Coupe 6-speed with FX3 & 2000 LS1 Vert 6-Speed with F45 Hunterdon County, NJ
Sounds like it might be the wiring --
suggest checking the plug and back track the plug wires -- maybe as far as the ECM (but be sure to pull battery cable if probing wires or pulling ECM connector so as to not damage the ECM).
suggest checking the plug and back track the plug wires -- maybe as far as the ECM (but be sure to pull battery cable if probing wires or pulling ECM connector so as to not damage the ECM).
