C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Issues getting Datastream with WINALDL

Thread Tools
 
Search this Thread
 
Old Nov 29, 2025 | 09:06 PM
  #1  
moodydavid16's Avatar
moodydavid16
Thread Starter
Advanced
All Eyes On Me
Liked
 
Joined: Mar 2023
Posts: 80
Likes: 4
From: Salt Lake, Utah
Default Issues getting Datastream with WINALDL

Hey all, if anyone has experience getting live data from their cars that could help me out would be great!

When I open WINALDL with my cable connected, the only data I have been able to display is in the raw data tab. I get a red 1 at the top, occasionally a two or three. But never this elusive green 20. The data displayed is usually just 255. See picture attached is there something I am doing wrong? Has anyone had a similar issue? Also I am only able to get this data with key off/ engine off. As soon as the key is on the data stops being displayed completely.

1986 corvette. Built 383. 700r4. 1221765 ecu. Currently working through the tuning



Reply
Old Nov 29, 2025 | 10:39 PM
  #2  
stew86MCSS396's Avatar
stew86MCSS396
Pro
All Eyes On Me
Photogenic
 
Joined: Aug 2020
Posts: 647
Likes: 126
From: Liliha Bakery stuffing my face with coco puffs!
Default

I’m not too versed in ‘165 but are you using the 10k resistor? I’m not even sure if you need it to get the slow 160 baud data stream.
Reply
Old Nov 30, 2025 | 02:14 AM
  #3  
moodydavid16's Avatar
moodydavid16
Thread Starter
Advanced
All Eyes On Me
Liked
 
Joined: Mar 2023
Posts: 80
Likes: 4
From: Salt Lake, Utah
Default

Originally Posted by stew86MCSS396
I’m not too versed in ‘165 but are you using the 10k resistor? I’m not even sure if you need it to get the slow 160 baud data stream.
ive tried it with/without doesn’t seem to make a difference.
Reply
Old Nov 30, 2025 | 02:45 PM
  #4  
1986C4Steve's Avatar
1986C4Steve
Heel & Toe
 
Joined: Aug 2025
Posts: 16
Likes: 0
Default

I also have an 86 and have just got to grips with data logging.
Out of preference I use TunerPro but Winaldl also works fine.
Your data cable must be in the 10k mode for it to work.
Unfortunately the 1227165 ECM only transfer's data at 160 baud that around 0.6 hz.
The good news is the ECM was used for several years and is compatible with a later bin file, I have burnt a 89 bin file but with a 86 spark map, as I have iron heads, it now transfer's data at 8192 baud or around 11 hz so I get a lot faster data rate and also more data as the later bin file has more items that can be monitored.
Reply
Old Nov 30, 2025 | 10:37 PM
  #5  
RustyDuster's Avatar
RustyDuster
Racer
Community Builder
Liked
Loved
Community Favorite
 
Joined: Mar 2025
Posts: 486
Likes: 233
Default

Originally Posted by moodydavid16
ive tried it with/without doesn’t seem to make a difference.
This is what made a difference for me when I was using my cable. The 10k mode put it at a higher idle it seemed though. Which cable are you using? I used this one:
https://obd2allinone.com/

Reply
Old Dec 1, 2025 | 02:52 AM
  #6  
moodydavid16's Avatar
moodydavid16
Thread Starter
Advanced
All Eyes On Me
Liked
 
Joined: Mar 2023
Posts: 80
Likes: 4
From: Salt Lake, Utah
Default

Originally Posted by RustyDuster
This is what made a difference for me when I was using my cable. The 10k mode put it at a higher idle it seemed though. Which cable are you using? I used this one:
https://obd2allinone.com/
i have the one from red devil river
https://reddevilriver.com/home-page/ols/products/gm-12-pin-aldl-to-usb-cable

i assume the 10k mode is with the little yellow jumper on and you take it off for regular.

Reply
Old Dec 2, 2025 | 01:42 PM
  #7  
moodydavid16's Avatar
moodydavid16
Thread Starter
Advanced
All Eyes On Me
Liked
 
Joined: Mar 2023
Posts: 80
Likes: 4
From: Salt Lake, Utah
Default

Also when i try using tunerprort it just doesn’t connect
Reply
Old Dec 2, 2025 | 02:07 PM
  #8  
1986C4Steve's Avatar
1986C4Steve
Heel & Toe
 
Joined: Aug 2025
Posts: 16
Likes: 0
Default

Originally Posted by moodydavid16
Also when i try using tunerprort it just doesn’t connect
I use the Moates cable and it works fine.
There is a history or the Red River one not connecting correctly to the early ECM.
Reply
Corvette Stories

The Best of Corvette for Corvette Enthusiasts

story-0

150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter

 Joe Kucinski
story-1

8 Coolest Corvette Pace Cars (and Replicas) of All Time

 Verdad Gallardo
story-2

Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)

 Joe Kucinski
story-3

Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!

 Verdad Gallardo
story-4

Top 10 Corvettes Coming to Mecum Indy 2026!

 Brett Foote
story-5

Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!

 Michael S. Palmer
story-6

10 Revolutionary 'Corvette Firsts' Most People Don't Know

 Joe Kucinski
story-7

5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2

 Michael S. Palmer
story-8

2027 Corvette vs The World: Every C8 vs Its Closest Competitor

 Joe Kucinski
story-9

10 Most Common Corvette Problems of the Last 20 Years!

 Joe Kucinski
Old Dec 3, 2025 | 07:50 PM
  #9  
RustyDuster's Avatar
RustyDuster
Racer
Community Builder
Liked
Loved
Community Favorite
 
Joined: Mar 2025
Posts: 486
Likes: 233
Default

I'm not as familiar with your cable, but mine has a resister on the USB connector that has four pins - and changing the configuration of the resistor switches from 10k mode to not. I should have noted though that mine is an 88 so that could be relevant as far as connection success is concerned.
Reply
Old Dec 10, 2025 | 04:14 PM
  #10  
moodydavid16's Avatar
moodydavid16
Thread Starter
Advanced
All Eyes On Me
Liked
 
Joined: Mar 2023
Posts: 80
Likes: 4
From: Salt Lake, Utah
Default

I ordered the moates cable but I am still having issues with that one. Any Ideas?
Reply
Old Dec 11, 2025 | 07:26 AM
  #11  
tequilaboy's Avatar
tequilaboy
Melting Slicks
 
Joined: Aug 2003
Posts: 3,389
Likes: 391
From: Lakeville MI
Default

Check the voltage on Pin B.

This log shows the effect of the 10k resistor (applied and open) on the Pin B voltage. The ECM must see correct voltage range in order to transmit ALDL data and to change modes.

https://datazap.me/u/tequilaboy/aldl...10-329-353-388

Important voltage levels:

;
; READ A/D AND CK DIAGNOSTIC PIN B VOLTAGE....
;
LDAA #$70 ; A/D Ch 7, (Start/Run Pwr)
JSR LF1BE ; To A/D subroutine
CMPA #40 ; 800 Mv
BCS LEA45 ; BR IF A/D LT 800 Mv, (GROUND'ED TST)
; ... else
CMPA #100 ; 2.00 VDV
BCS LEA47 ; BR IF A/D LT 2.00 VDC
; ... else
CMPA #152 ; 3.04 VDV
BCC LEA47 ; BR IF A/D GT 3.05 VDC, (ROAD TST MODE)
; ... else
BRSET L0046,$08,LEA47 ; BR If 8192 Mode in locked Mode
; ... else
ORAB #$20 ; SET b5
BRA LEA47 ;

Otherwise, check the wiring integrity/continuity of pins E and B between the ALDL connector and the ecm and also verify that pin A is ground.

Last edited by tequilaboy; Dec 11, 2025 at 08:54 AM.
Reply
Old Dec 11, 2025 | 10:02 PM
  #12  
moodydavid16's Avatar
moodydavid16
Thread Starter
Advanced
All Eyes On Me
Liked
 
Joined: Mar 2023
Posts: 80
Likes: 4
From: Salt Lake, Utah
Default

Originally Posted by tequilaboy
Check the voltage on Pin B.

This log shows the effect of the 10k resistor (applied and open) on the Pin B voltage. The ECM must see correct voltage range in order to transmit ALDL data and to change modes.

https://datazap.me/u/tequilaboy/aldl...10-329-353-388

Important voltage levels:

;
; READ A/D AND CK DIAGNOSTIC PIN B VOLTAGE....
;
LDAA #$70 ; A/D Ch 7, (Start/Run Pwr)
JSR LF1BE ; To A/D subroutine
CMPA #40 ; 800 Mv
BCS LEA45 ; BR IF A/D LT 800 Mv, (GROUND'ED TST)
; ... else
CMPA #100 ; 2.00 VDV
BCS LEA47 ; BR IF A/D LT 2.00 VDC
; ... else
CMPA #152 ; 3.04 VDV
BCC LEA47 ; BR IF A/D GT 3.05 VDC, (ROAD TST MODE)
; ... else
BRSET L0046,$08,LEA47 ; BR If 8192 Mode in locked Mode
; ... else
ORAB #$20 ; SET b5
BRA LEA47 ;

Otherwise, check the wiring integrity/continuity of pins E and B between the ALDL connector and the ecm and also verify that pin A is ground.
I dont think my pin d is being used
i just have ABCEFG

when i checked between pin a and b i got .4v key on engine off
Reply
Old Dec 11, 2025 | 10:14 PM
  #13  
moodydavid16's Avatar
moodydavid16
Thread Starter
Advanced
All Eyes On Me
Liked
 
Joined: Mar 2023
Posts: 80
Likes: 4
From: Salt Lake, Utah
Default

Results when reading voltage between pins key on engine on(Volts D/C)
A/B steady 0.40
A/C 0
A/E fluxuates between ~2 - 4.51
A/F ~6.05
A/G 0

Reply
Old Dec 11, 2025 | 10:18 PM
  #14  
moodydavid16's Avatar
moodydavid16
Thread Starter
Advanced
All Eyes On Me
Liked
 
Joined: Mar 2023
Posts: 80
Likes: 4
From: Salt Lake, Utah
Default

@tequilaboy sorry if I didn’t correctly understand what you wanted me to do, I'm not very smart with this stuff.
Reply

Get notified of new replies

To Issues getting Datastream with WINALDL





All times are GMT -4. The time now is 10:50 PM.

story-0
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter

Slideshow: From C1 to C8 we compare every Corvette generation by the numbers.

By Joe Kucinski | 2026-05-12 16:54:12


VIEW MORE
story-1
8 Coolest Corvette Pace Cars (and Replicas) of All Time

Slideshow: Some Corvette pace cars became collectible legends, while others perfectly captured the look and attitude of their era.

By Verdad Gallardo | 2026-05-11 09:50:51


VIEW MORE
story-2
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)

Slideshow: Ranking the top 10 Corvette engines by torque output.

By Joe Kucinski | 2026-05-05 11:58:09


VIEW MORE
story-3
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!

Slideshow: A Corvette pace car nearly matching IndyCar speeds sounds exaggerated, until you look at the numbers.

By Verdad Gallardo | 2026-05-04 20:03:36


VIEW MORE
story-4
Top 10 Corvettes Coming to Mecum Indy 2026!

Among a rather large group of them.

By Brett Foote | 2026-05-04 13:56:44


VIEW MORE
story-5
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!

Slideshow: the top 10 things Corvette owners want in the C9 Corvette

By Michael S. Palmer | 2026-04-30 12:41:15


VIEW MORE
story-6
10 Revolutionary 'Corvette Firsts' Most People Don't Know

Slideshow: 10 Important Corvette 'firsts' that every fan should know.

By Joe Kucinski | 2026-04-29 17:02:16


VIEW MORE
story-7
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2

Slideshow: Should you buy a 2020-2026 Corvette or wait for 2027?

By Michael S. Palmer | 2026-04-22 10:08:58


VIEW MORE
story-8
2027 Corvette vs The World: Every C8 vs Its Closest Competitor

Slideshow: 2027 Corvette lineup vs the world.

By Joe Kucinski | 2026-04-24 16:12:42


VIEW MORE
story-9
10 Most Common Corvette Problems of the Last 20 Years!

Slideshow: 10 major Corvette problems from the last 20 years.

By Joe Kucinski | 2026-04-14 16:37:05


VIEW MORE