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Thread: Engine Conversions and Park/Neutral Signal

  1. #1
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    Default Engine Conversions and Park/Neutral Signal

    What you should know about park/neutral when doing an engine conversion with the LS1 PCM and automatic transmission...

    Camaro/Firebird
    This is the only vehicle I'm aware of with the traditional single wire park/neutral indicator. Ground the orange/black wire connected to BLUE PCM connector pin 34 to indicate park/neutral. This is how the PCM knows which commanded idle value to use.

    Corvette and Truck
    These vehicles use four wires to the PCM to determine selected gear from a switch mounted externally on the 4L60E/4L80E. Faking the park signal by applying ground to pins 32 and 34 may result in a long delay for the PCM to recognize gear change.

    Calibration Choices
    Determining a base calibration begins with crank resolution type (24x or 4x), throttle type (cable or electronic), and transmission type (4L60E or 4L80E). I've seen applications where the base calibration expected the gear select switch, but the transmission was not equipped.

    Park/Neutral Calibration Options
    A recent customer ran into this issue and was able to change the value for gear select switch to P/N only. Currently I don't think EFILive has this, but I'm sure a .CAX could be worked up by someone with the know-how.

    A practical example would be an electronic throttle equipped engine with TH350/TH400 transmission.

    Hope this helps.
    Last edited by S10Wildside; May 26th, 2011 at 07:47 PM.
    24x LS1 PCM on Early Small-Block Chevy and LT1/LT4
    http://www.eficonnection.com

  2. #2
    Lifetime Member schwoch1's Avatar
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    Quote Originally Posted by S10Wildside View Post
    A practical example would be an electronic throttle equipped engine with 700R4 transmission.
    How would one pull the TV cable on a 700-R4 with electronic throttle. Reason I ask, I just had someone ask the same thing and was thinking maybe you came up with a workaround and didn't tell anyone

    Mike
    Current toys are as follows:
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  3. #3
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    Quote Originally Posted by schwoch1 View Post
    How would one pull the TV cable on a 700-R4 with electronic throttle. Reason I ask, I just had someone ask the same thing and was thinking maybe you came up with a workaround and didn't tell anyone

    Mike
    Hey Mike. Yeah, just run a pull cord into the passenger compartment. Your right hand isn't doing anything anyway, so you may as well use it for something.

    The 700R4 was a bad example, I should have said TH350. Corrections above. Good call.
    24x LS1 PCM on Early Small-Block Chevy and LT1/LT4
    http://www.eficonnection.com

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    On 1999 to 2002 truck DBC applications - have seen conversions where people have mounted the TV cable from a 700R4 in the place (bracket & TB) normally occupied the Cruise Control cable. Have never done this - not sure if the geometry of the eccentric on the TB is reasonably close to provide the correct TV input to the 700R4.


    Regards,
    Taz

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    so are you saying if i have a 0411 in a muscle car with a t-400 to ground the p/n wire permanently? or leave it open. mine is grounded right now,
    1970 AMC Javelin. AES 390ci. MAST CNC LS3 heads,DragonSlayer-Ultra rods, Vic.Jr., wilson, N-W 102 T/B, 95lb. "FIC 1000cc. injectors", Lonnies Performance twin pumps/harness. Twin TC-70-65's flipped manifolds, A/W intercooler, TH-400, Griner 1+2 trans brake, PTC converter, 3.50 gear 29-18.5-15 tires. Alston Battle Cruizer 4-Link, Fab-9. Cage, tubs, PSI harness, 0411 ECM. EFI Live,

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    If you are using a Camaro / Firebird OS - then ground C1 pin 34 when in park / neutral - release (open) the ground when in gear.

    You may be able to rig something up to any existing column shifter, or use a micro switch with an aftermarket floor shifter.


    Regards,
    Taz

  7. #7
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    is there a work around in the tune? there is really no easy way with the b&m quicksilver shifter.
    1970 AMC Javelin. AES 390ci. MAST CNC LS3 heads,DragonSlayer-Ultra rods, Vic.Jr., wilson, N-W 102 T/B, 95lb. "FIC 1000cc. injectors", Lonnies Performance twin pumps/harness. Twin TC-70-65's flipped manifolds, A/W intercooler, TH-400, Griner 1+2 trans brake, PTC converter, 3.50 gear 29-18.5-15 tires. Alston Battle Cruizer 4-Link, Fab-9. Cage, tubs, PSI harness, 0411 ECM. EFI Live,

  8. #8
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    You cannot work around a signal (in the tune) for the transmission being physically in park VS in gear. Did I misunderstand what you are asking? This reply seems to be obvious?
    24x LS1 PCM on Early Small-Block Chevy and LT1/LT4
    http://www.eficonnection.com

  9. #9
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    i guess what im saying is mine is grounded all the time, "i have not driven the car or even put it in gear" im just working up a start up tune and looking for advise before i try to drive it.

    it was running fairly good, but now it will start and then die, "like it is running out of fuel" i should just start a new thread.
    1970 AMC Javelin. AES 390ci. MAST CNC LS3 heads,DragonSlayer-Ultra rods, Vic.Jr., wilson, N-W 102 T/B, 95lb. "FIC 1000cc. injectors", Lonnies Performance twin pumps/harness. Twin TC-70-65's flipped manifolds, A/W intercooler, TH-400, Griner 1+2 trans brake, PTC converter, 3.50 gear 29-18.5-15 tires. Alston Battle Cruizer 4-Link, Fab-9. Cage, tubs, PSI harness, 0411 ECM. EFI Live,

  10. #10
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    B&M shifters are setup to use B&M micro switches. Some shifters come with a micro switch for park / neutral and another for reverse lights.

    Easy to do ...


    Regards,
    Taz

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