LQ4-E39

iTrader: (3)

No help over on LS1Tech so I figured I'd give it a try here.

I am currently running a stock 2003 LQ4 MAF tube in my swap with a 3" stainless pipe going to a small filter. The lump is out of a 2003 Chevy Express 3500 Van, PCM is green/blue connectors. Identical to this:



Here is what my connector looks like:




I'd like to move up to a 4" intake tube for better throttle response, which requires the use of a different MAF sensor as mine cannot be removed from the tube. So, I purchased the following:

LSX MAF Bung (weld in, aluminum)

and LS7 MAF, GM PN 15865791


It appears that although the 5 pin connector is physically the same between the LQ4 MAF and the LS7 card MAF, the pinout internally is different (according to research about this general procedure).

LS7
Pin - Wire - Circuit - Function
A - 0.35 YE - 492 - Mass Air Flow (MAF) Sensor Signal
B - 0.8 BK/WH - 451 - Ground
C - 0.5 PK - 539 - Ignition 1 Voltage
D - 0.35 TN - 2760 - Low Reference
E - 0.35 TN - 472 - Intake Air Temperature Sensor Signal


I did find this post. Halfway down is the MAF pinout for a 2005 6.0 MAF (assuming it is the same as my 2003...)

The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - 2005 4.8, 5.3, 6.0 connector/pinout information

So we get:

LQ4
A-------------BK-------------------552----------Low Reference
B-------------TN-------------------472--------IAT Sensor Signal
C-----------BK/WH----------------451--------------Ground
D-------------PK-------------------439---------Ignition 1 Voltage
E-------------YE-------------------492---------MAF Sensor Signal


LS7
Pin - Wire - Circuit - Function
A - 0.35 YE - 492 - Mass Air Flow (MAF) Sensor Signal
B - 0.8 BK/WH - 451 - Ground
C - 0.5 PK - 539 - Ignition 1 Voltage
D - 0.35 TN - 2760 - Low Reference
E - 0.35 TN - 472 - Intake Air Temperature Sensor Signal



Which means I need to do the following pin swaps at my MAF connector for the PCM to read the new MAF properly:

A -> D
B -> E
C -> B
D -> C
E -> A

Can anyone confirm?

Does anyone have any input on the LS7 MAF pinout differences as compared to a stock 2003 LQ4 MAF harness? I have no problem swapping wires, just need to know what the pinouts are.

LQ4-E39

iTrader: (3)

bump before the weekend