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Thread: E38 Oil Temp Sensor Input

  1. #21
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    SSDOS

    OS 12628982
    World Manufacturer Index 2G1 General Motors Chevrolet - Canada
    Year of manufacture 9 2009
    Model WT Impala LT 3.5 Sedan
    Engine K LZE, L36, L36, LEA
    Engine size K 3.5 litre V6 SFI, 3.8 litre V6 SFI

    Well that pretty much covers the V6 Impala's.

    Ok Ben, your turn to show an "Early model" GMLAN example we can compare with.

    I'm gonna go out on a limb here and say, it's a Vette thing. The BCM in the Vette's from 6-12 doesn't look anything like ones in other GM trucks or cars I've seen. More like a SAM module found in MB or other German chassis. If this protocol difference was only release date related, why didn't they upgrade the Vette's? Hardware supplier contracts maybe?

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  2. #22
    Lifetime Member DURAtotheMAX's Avatar
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    Quote Originally Posted by kidturbo View Post
    SSDOS

    OS 12628982
    World Manufacturer Index 2G1 General Motors Chevrolet - Canada
    Year of manufacture 9 2009
    Model WT Impala LT 3.5 Sedan
    Engine K LZE, L36, L36, LEA
    Engine size K 3.5 litre V6 SFI, 3.8 litre V6 SFI

    Well that pretty much covers the V6 Impala's.

    Ok Ben, your turn to show an "Early model" GMLAN example we can compare with.

    I'm gonna go out on a limb here and say, it's a Vette thing. The BCM in the Vette's from 6-12 doesn't look anything like ones in other GM trucks or cars I've seen. More like a SAM module found in MB or other German chassis. If this protocol difference was only release date related, why didn't they upgrade the Vette's? Hardware supplier contracts maybe?

    Click image for larger version. 

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    Because the vette came out in 2005, 2004 if you count the caddy XLR.

    So that very early introduction of GMLAN on the 04 XLR/05 vette was 2 years before GM introduced "common architecture". Common arch was the first GM car/truck electrical architecture that was 100% GMLAN, using GMLAN on the interior and completely abandoning Class 2.

    They called it common-architecture because 95% of all the modules were all the same regardless of car/truck/SUV...just different trim plates to accommodate different dash/interior designs. The common-arch era/generation Caddy DTS, CTS, acadia, silverado, tahoe, impala, express van etc all use the exact same door modules, HVAC modules, switchgear, radios, RCDLR, RPA, BCM, CAN messaging etc.

    Why GM's first foray into CAN used the older ID subset, and then they retired it on new platforms 1-2 years later when common arch began to be rolled out....I have no idea.

    CAN wasnt on the 05 Impala. It started in 06.
    2005 Silverado, CC/SB, 4x4, LT, LILLY/Allison
    12.9s @ 108 mph

    many thanks to Ross and Paul

  3. #23
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    Quote Originally Posted by DURAtotheMAX View Post
    Why GM's first foray into CAN used the older ID subset, and then they retired it on new platforms 1-2 years later when common arch began to be rolled out....I have no idea.
    That's good to know. Whats strangers is the Corvette still using that early GMLAN introduction in 2012.. Musta had a bunch of pre-programmed BCM's on the shelf... lol

    What you have for ID's and Byte outputs on that early data set Ben? I've got a few tagged from bench testing so far, but what I need is Tach, Load, and APPS. My test Vette is still in the shop getting a new ECM programmed untill next week sometime. So got me on hold. Shoot me an Email if ya have anything please.

    Ross, I'm going to attempt a cax file from scratch to move that pin assignment. I see {G1221} isn't used in the 12609099 OS. Is that a good choice that shouldn't interfere under other E38 OS version either? Only checked a couple others so far. Thanks

    -K

  4. #24
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    Success!!

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    X2 Pin 23 signal now displaying as "True" EOT values under GM.EOILTS.

    Should work perfect in stand alone setups.

    Related notes so far.
    *Trans Temp value reads 350F now. So this might require a DTC or other related table changes.
    *Standard OBD-II Engine oil temperature PID 0x5C doesn't report it. Mode 22 Pid looks fine.
    *No assigned byte position for EOT values detected in HS GMLAN broadcasts. However, EOT, MAP, and AC Pressure all seem to tie into high priority msg ArbID 0x120 42 5a 62 5a 42 5a 03 11

    That needs a little more research, but the hard part's done.

    Thanks again Ross.

  5. #25
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    Did a little more bench testing today. Looks like standard OBD-II 0x5c EOT pid still reports the "estimated" EOT values relating to IAT and ECT inputs. Which brings up another question.

    How can we determine which EOT data the following tables are actually using?

    {B5212} Rev Limiter By Oil Temp
    {B5213} Rev Limiter By Oil Temp Enable RPM
    {B5214} Rev Limiter By Oil Temp Disable RPM

    Is that controlled by options {G1218} ?

    For the pin mod to be effective, we should verify connected tables are also using it correctly.

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  6. #26
    Joe (Moderator) joecar's Avatar
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  7. #27
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    Would ya happen to know that pin address under OS 12614676 ? That is the correct O7 LS7 version, not the 12639835 I previously listed...

    Just caught that tonight when I stated to update this 06-07 ECM, and noticed the VIN description said 5.3L ..

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