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

Issues getting Datastream with WINALDL

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Old Nov 29, 2025 | 09:06 PM
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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



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Old Nov 29, 2025 | 10:39 PM
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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.
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Old Nov 30, 2025 | 02:14 AM
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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.
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Old Nov 30, 2025 | 02:45 PM
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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.
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Old Nov 30, 2025 | 10:37 PM
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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/

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Old Dec 1, 2025 | 02:52 AM
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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.

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Old Dec 2, 2025 | 01:42 PM
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Also when i try using tunerprort it just doesn’t connect
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Old Dec 2, 2025 | 02:07 PM
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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.
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Old Dec 3, 2025 | 07:50 PM
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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.
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Old Dec 10, 2025 | 04:14 PM
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I ordered the moates cable but I am still having issues with that one. Any Ideas?
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Old Dec 11, 2025 | 07:26 AM
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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.
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Old Dec 11, 2025 | 10:02 PM
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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
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Old Dec 11, 2025 | 10:14 PM
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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

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Old Dec 11, 2025 | 10:18 PM
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@tequilaboy sorry if I didn’t correctly understand what you wanted me to do, I'm not very smart with this stuff.
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