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93-95 TBI truck owners (or anyone using a 4L60-E), can you do me a favor?

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Old Nov 25, 2006 | 11:37 PM
  #1  
dimented24x7's Avatar
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From: Moorestown, NJ
Car: 88 Camaro SC
Engine: SFI'd 350
Transmission: TKO 500
Axle/Gears: 9-bolt w/ 3.23's
93-95 TBI truck owners (or anyone using a 4L60-E), can you do me a favor?

Im going through the trans code in the PCM and Im needing to know some info on the range sensor.

The existing comments in the hack give the following for the values for each of the range bits:

Code:
    ; PRNDL TABLE:
    ; RANGE1  RANGE2 RANGE3  GEAR
    ; ---------------------------
    ;   0        1     1     Low
    ;   1        1     1     Drive2
    ;   1        1     0     Drive3
    ;   1        0     0     Drive4
    ;   1        0     1     P/N
    ;   0        0     1     Reverse
Currently, Im trying to translate those raw inputs to how theyre stored as the actual selected gear range and Im getting something that makes sense, but its different from what has been given in the hacks. I want to make sure that what I have is actually right and I dont want to go off the info they give since alot of it is incorrect.

Can someone verify (either from a service manual or from a working vehicle) that the range inputs 1, 2, and 3 above actually correspond to the following gears in the table when that gear is selected? In the ALDL list, this is byte #25, I/O port C in the ADS file.
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Old Nov 26, 2006 | 12:15 AM
  #2  
HaulnA$$'s Avatar
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Joined: Jul 2003
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From: Dallas
Originally Posted by dimented24x7
Im going through the trans code in the PCM and Im needing to know some info on the range sensor.

The existing comments in the hack give the following for the values for each of the range bits:

Code:
    ; PRNDL TABLE:
    ; RANGE1  RANGE2 RANGE3  GEAR
    ; ---------------------------
    ;   0        1     1     Low
    ;   1        1     1     Drive2
    ;   1        1     0     Drive3
    ;   1        0     0     Drive4
    ;   1        0     1     P/N
    ;   0        0     1     Reverse
Currently, Im trying to translate those raw inputs to how theyre stored as the actual selected gear range and Im getting something that makes sense, but its different from what has been given in the hacks. I want to make sure that what I have is actually right and I dont want to go off the info they give since alot of it is incorrect.

Can someone verify (either from a service manual or from a working vehicle) that the range inputs 1, 2, and 3 above actually correspond to the following gears in the table when that gear is selected? In the ALDL list, this is byte #25, I/O port C in the ADS file.
According to the FSM, the above table is correct. It assumes that a 1=12V=range switch off and a 0=0V=range switch on, so therefore, the table as you have it is in inverse logic form but it is correct. The tables in the manual list the inputs as Range A,B,C which correspond to your Range 1,2,3 respectively. HTH
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Old Nov 26, 2006 | 01:12 PM
  #3  
dimented24x7's Avatar
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From: Moorestown, NJ
Car: 88 Camaro SC
Engine: SFI'd 350
Transmission: TKO 500
Axle/Gears: 9-bolt w/ 3.23's
Ok, cool...

The PCM looks up the state of the gear range from those bits, and I just wanted to make sure I had the right info before continuing on.
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Old Nov 26, 2006 | 10:57 PM
  #4  
Fast355's Avatar
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From: Hurst, Texas
Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
Originally Posted by dimented24x7
Ok, cool...

The PCM looks up the state of the gear range from those bits, and I just wanted to make sure I had the right info before continuing on.
What is the project now? Electronic transmission with MAF?
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Old Dec 7, 2006 | 06:38 PM
  #5  
dimented24x7's Avatar
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Joined: Jan 2002
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From: Moorestown, NJ
Car: 88 Camaro SC
Engine: SFI'd 350
Transmission: TKO 500
Axle/Gears: 9-bolt w/ 3.23's
Not with my car. Id need a new crank if I wanted to use an automatic. My block had a misalignment issue that caused the trans not to be on center. Wiped out a nice 700-R4 that I rebuilt and the TC pilot wore a deep groove in my crank. Id still like to figure it out, though.
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