Mon Jul 08, 2013 3:56 pm by Admin

For the benefit of 944Hybrids users there are two search functions available for you to use.
The purpose of this sticky is to explain the "Advanced Search" function because it is much more powerful and is the best choice when researching information.

When you log on to the site a list of options is shown in a line at the top of the page. One option is labelled "Search", use this option (NOT the search box lower down on the right).

After you click on the upper search option, a drop down box appears. At the bottom of this box is a radio button marked "Advanced …

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ECM OBDII Question

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ECM OBDII Question

Post  Bluemach1 on Wed Nov 11, 2009 5:25 pm

I am a little perplexed about something. After reading through several sites and Gregs manual I still dont know where the OBDII connector gets integrated into the electrical system. This must be very obvious becasue I have not seen this asked anywhere else.

Please enlighten me. Embarassed


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Join date : 2009-08-18
Location : Cameron Park, CA

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Re: ECM OBDII Question

Post  gt1scca on Wed Nov 11, 2009 8:04 pm

*It's in there, page 103, under the "cheesy" fan schematic... Razz

SO, from


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All OBD2 ports for LS1, Vortec Truck are the same.

Pin 2 - Serial Data - FROM the PCM.
Pin 4 & 5 - GROUND - Usually only pin 5 is needed, however some scan tools/code readers will need GROUND on pin 4 as well.
Pin 16 - 12v+ BATTERY - Power from 12v+ Battery source.

, 96-97 will have additional wiring to OBD2 port.

Pin 6 - Diagnostic Request/Field Output Enable
Pin 9 - UART Serial Data
NOTE: 1995 LT1 used an OBD2 port, but were not OBD2 vehicles. These did not have a Serial Data on Pin 2. These used pin 9.
EDIT: None of the ALDL / DLC wiring is connected to the 944 wiring...
all connections either come from the PCM or ground.


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Re: ECM OBDII Question

Post  gt1scca on Wed Nov 11, 2009 8:27 pm

Oh, forgot about the check engine light, but...
it (an aftermarket light assembly) can be added anywhere and connected to -

PCM pin 9 PLUG D / BLUE on LT1
PLUG C2 / RED [pin 46] on LSX.


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