[Gmecm] gm 5300 OBD2 port wiring

[WopOnTour]

Either Class 2 signal line from the PCM Connector C1 terminals 58 or 59 should be wired to terminal 2 off the 16 pin DLC. (they are just spliced togeter within the PCM anyways) The other Class 2 circuit from the PCM  was originally wired to the BCM as part of the Passlock theft detterant system. Since it sounds like your actaul vehicle application is "ealier" than 1996 (there are ZERO UART based modules on a 2002 GMT800 truck) ANY UART modules you may have (ABS, SIR, etc) on your vehicle should be wired to pin 9 of the DLC. Given the complexity of things like the theft detterant and instrumentation, this is NOT what I would classify an "easy" swap. Good Luck
WOT 
  ----- Original Message ----- 
  From: Robert Fleming 
  To: Steve Ravet ; For discussion of GM EFI hardware and software 
  Sent: Saturday, March 12, 2005 9:45 PM
  Subject: RE: [Gmecm] gm 5300 OBD2 port wiring


  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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