[Gmecm] gm 5300 OBD2 port wiring

[Robert Fleming]

There are 2 UART wires right next to each other with the same color.  
 
There are also 2 wires that go to the ecm that are labelled as class 2 serial data.  It does not say high or low.  Anyone know which one goes where on the diagnostic link?

Steve Ravet <Steve.Ravet at arm.com> wrote:


________________________________

From: gmecm-bounces at diy-efi.org
[mailto:gmecm-bounces at diy-efi.org] On Behalf Of Robert Fleming
Sent: Thursday, March 10, 2005 2:36 PM
To: gmecm at diy-efi.org
Subject: [Gmecm] gm 5300 OBD2 port wiring


I'm looking at a 5.3 swap and am running into some problems on
the OBD2 diagnostic port wiring. It is a 2002 5.3 and the FSM pinout
says that pins 14 and 15 are UART serial data and 58 is class 2 serial
data. Now I assume at the least the UART serial data pins are high and
low, but the problem is they are both orange and black. And does the
class 2 serial data use the vehicle chassis ground as its low? The
harness that came with the engine had the chassis side chopped off, so
tracing wires doesn't answer the question.

Any help is appreciated.

Thanks,
Robert



Robert, you might find that the 2 UART wires are the same signal in 2
different cavities. The schematics should show if this is the case.
class2 is referenced to ground. what are you swapping into?

--steve


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