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Thread: E38 VATS Non-start

  1. #1
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    Default E38 VATS Non-start

    So I have been trying to get an LS2 going into a 1970 Camaro. The issue is that it cranks, starts up and revs to about 1500 rpm, sputters, and then dies. Each start, it runs for less time until it just cranks. I think it is VATS. Fuel pressure was solid. If you give it any gas, the engine dies immediately. APP and ETCTP seem fine, they both respond to throttle input with engine off.

    The details are as follows:

    2006 LS2 (58X)
    PSI Harness
    2007 TBSS Throttle Body (silver blade)
    2010 Camaro SS Accelerator Pedal Assembly
    Bosch Green Top 42# Injectors (scaled for 4 bar)
    Bypass style regulator set at 58 PSI

    GM Service E38 Number: 12597121
    GM OS: 12608677
    GM T42 Controller
    TM T42 OS: 24235341

    I applied the patch, updated the VATS as such:

    LABELS
    Parameters Value
    {G1204} VATS Enable Yes
    {G1205} VATS Auto learn Enable Yes
    {G1206} VATS Required To Run No
    {G1208} VATS Fail Diagnostic Disabled
    {G1209} VATS Mode No
    {G1210} VATS Type Type 2
    {G1211} Remote Start Allowed Yes
    {G1214} Relearn Count 3.000000 Counts
    {G1215} Relearn Timer 600.000000 Seconds
    {G1216} Theft Relearn Password Yes

    I also tried many combinations of No and Yes and Type without any change.

    The starter relay was set like this:
    LABELS
    Parameters Value
    {G1213} Clutch Depress To Crank Yes
    {G1217} Maximum Cranking Time 15.000000 Seconds
    {G1219} Starter Relay Diagnostic Disabled
    {G1220} Starter Relay Type Not Used

    What could it be??

    Do I need to change any DTCs to Not Reported?
    Attached Files Attached Files
    00 Silverado Z71, LQ9 w/ LS3 heads, BTR cam, Whipple 2.9@8#, 4l80E

  2. #2
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    Is 06 the crossover year where some LS2's are 24x and some are 58x?

    Try setting G1204 to No, is there a VATS patch available for your OS? Try full flashing this as well, old threads mention you need to full flash to remove VATS.

    Have you verified the Camaro pedal assembly works with the OS you're using?
    Have you verified the TBSS throttle works with the OS you're using? TBSS' only used truck throttle bodies, if it's a "LS2 silver blade" then it's likely an 06-08 Vette tb (even better!)
    Do the +5V throttle voltage lines move appropriately when moving the pedal based on the OS? Depending on the OS/platform in question: 1 line should move up from 0->5V and the other from 5->0V; 1 line move down from 5->0V, the other up from 0->5V; both move from 0->5V; both move from 5->0V.

    It doesnt look like the VIN matches the OS, however if this ECM was programmed properly it will be setup as an 07+ Silverado. The pedal assembly and throttle body (might be ok) don't match the currently programmed OS. These are going to lead to a few issues that may or may not be able to be resolved without matching these up. Do you have a truck pedal assembly and/or a truck throttle body you could swap out and try?
    ~Erik~
    2013 Sonic RS Manual - 1.4L I4T E78, tuned, turbo mods, etc.
    2008 TrailBlazer SS 3SS AWD Summit White - LS2 E67/T42, bolt ons, suspension, etc.
    2002 Chevy TrailBlazer LT 4X4 Summit White - 4.2L I6 P10, lifted, wheels, etc.

  3. #3
    Joe (Moderator) joecar's Avatar
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    In addition to what Erik said, also try setting G1210 to Type 3.

  4. #4
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    Quote Originally Posted by ScarabEpic22 View Post
    Is 06 the crossover year where some LS2's are 24x and some are 58x?

    Try setting G1204 to No, is there a VATS patch available for your OS? Try full flashing this as well, old threads mention you need to full flash to remove VATS.

    Have you verified the Camaro pedal assembly works with the OS you're using?
    Have you verified the TBSS throttle works with the OS you're using? TBSS' only used truck throttle bodies, if it's a "LS2 silver blade" then it's likely an 06-08 Vette tb (even better!)
    Do the +5V throttle voltage lines move appropriately when moving the pedal based on the OS? Depending on the OS/platform in question: 1 line should move up from 0->5V and the other from 5->0V; 1 line move down from 5->0V, the other up from 0->5V; both move from 0->5V; both move from 5->0V.

    It doesnt look like the VIN matches the OS, however if this ECM was programmed properly it will be setup as an 07+ Silverado. The pedal assembly and throttle body (might be ok) don't match the currently programmed OS. These are going to lead to a few issues that may or may not be able to be resolved without matching these up. Do you have a truck pedal assembly and/or a truck throttle body you could swap out and try?
    Thanks for the response!

    I did set G1204 to No.

    All flashes with VAT changes were full flashes.

    I verified that the App and TB (APP and ETCTP PIDs) followed each other with key on and engine off. It also looked like the TB went to about 17-19% on start up which seems right to me. I did not log the voltages between the two sensors. I only see two throttle voltage PIDs - TPMIN1 and TPMIN2. Were you referring two probing with a multimeter and checking voltage?

    The OS is for 2007 Avalanche according to the VIN decoder I used.

    I will look into the truck pedal assembly. I assume Silverado and Avalanche use the same? I think the pin outs are different as well. I'll also try to source a stock truck TB. Do the 08 and up Silverado and TBSS share the same TB?

    Based on the provided logs, does it look like the VATS are disabled properly. The reason I have multiple logs is because I tried many full flashes with different VAT combinations - Type 2 and 3, as well as selecting some and all No's.

    Should I have done a relearn procedure? Are there DTCs to remove?

    Man the Gen 3 stuff is much easier!! Haha
    Last edited by LastCall; August 26th, 2016 at 05:59 AM.
    00 Silverado Z71, LQ9 w/ LS3 heads, BTR cam, Whipple 2.9@8#, 4l80E

  5. #5
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    Quote Originally Posted by joecar View Post
    In addition to what Erik said, also try setting G1210 to Type 3.
    I tried that without any change.

    Erik - ScarabEpic22 - nice to meet you and thanks for posting. I've read a lot of your posts.
    00 Silverado Z71, LQ9 w/ LS3 heads, BTR cam, Whipple 2.9@8#, 4l80E

  6. #6
    Joe (Moderator) joecar's Avatar
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    Try also:
    - set G1214 to 1.
    - set G1215 to 1.

  7. #7
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    Quote Originally Posted by joecar View Post
    Try also:
    - set G1214 to 1.
    - set G1215 to 1.
    Will do. Anyway to confirm in the logs VATS were disabled?
    00 Silverado Z71, LQ9 w/ LS3 heads, BTR cam, Whipple 2.9@8#, 4l80E

  8. #8
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    What model car is the 2006 ls2 engine from? did you confirm there is a 58x reluctor wheel on the crankshaf,t and not 24x ? What color is the crankshaft position sensor?
    1997 S10, 06 trailblazer SS LS2 swap, 4L70E trans, 76mm turbo. Factory ZQ8 suspension. 3.08, G80 w/a zexel. With a 0411 swap.

  9. #9
    Joe (Moderator) joecar's Avatar
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    Log the pid GM.VTD during cranking.

  10. #10
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    The only Ls2 engine to use a 58x reluctor in 2006 was just the corvette I believe. If the engine came from any other car it is 24x and the e38 ecm is not setup to operate 24x.
    1997 S10, 06 trailblazer SS LS2 swap, 4L70E trans, 76mm turbo. Factory ZQ8 suspension. 3.08, G80 w/a zexel. With a 0411 swap.

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