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#1 |
Moderator
![]() Join Date: Oct 2008
Location: Wentworth, NH
Posts: 4,950
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1982-1995 GM ALDL
PC hardware and software for diagnostic code reading and real-time data logging on the cheap... or at least a whack at it. ALDL is an acronym that means Assembly Line Diagnostic Link It's a proprietary GM PWM TTL level Serial communications protocol. It was not standardized even loosely within GM divisions. It varied greatly by model, nameplate, year, and even engine choice. Mr Goodwrench used the Tech I and later the Tech II to communicate with these vehicles. If you can find a working Tech I or a real Tech II they have more functionality than any aftermarket solution depending on your needs. The Tech I is all but extinct (I haven't seen one for sale in over 2 years). Most of us can't afford a real Tech II and those are getting scarce. If I could afford a real Vertronix or HP Tech II I don't feel confident that I could weed out the Chinese counterfeits... there seem to be more poorly constructed Chinese knockoffs than the real thing now and they are priced the same or more. 12 terminal ALDL jack (OBD) Repair parts Delphi 12020043 ALDL Jack with 15484100 FEM METRIPAK 280 18AWG Au PLTD terminals. ![]() [A] ECM Ground [B) Diagnostic Enable [C] ECM to Air Switch Solenoid [D] CLCC (If used) 160 Baud Serial Data TX only (1982-1986 Carburettor Trucks) [E] 160 Baud TTL Serial Data TX only [F] ECM Driver or Vac Switch for TCC [G] Fuel Pump Prime [H] RWAL VSS [M] 8192 Baud TTL serial data TX & RX Not all positions are populated on all vehicles and usually only one serial data line is present. 1995 16 terminal ALDL Jack (OBD 1.5) This looks like 1996 and later J1962 OBD II jacks because it is physically the same jack. Electrically it is not the same. I would be sorely tempted to install the old ALDL jack if I owned a 1995 GM. Repair Parts Molex 511151601 with Molex 50420-8000 terminals and Terminal Retainer 0511181605 ![]() [5] Ground [9] 8192 Baud bi-directional TTL serial data RX & TX [16]ECM + Power "Paper clip" method The diagnostic lamp is called several different things. SES (Service Engine Soon) MIL (Malfunction Indicator Lamp) CEL (Check Engine Lamp) these acronyms all refer to the same lamp... if it reliably lights during the bulb check, when the ignition is switched on, this method can probably be used. PC Method
Hopefully this is useful to you folks.
__________________
1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials...
And please let us know if and how your repairs were successful. Last edited by hatzie; 03-02-2019 at 11:46 AM. |
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#2 |
Moderator
![]() Join Date: Oct 2008
Location: Wentworth, NH
Posts: 4,950
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Android ALDL OBDII & CAN (GMLAN) Diagnostics
I will be adding to and refining this writeup. Android Devices Android tablets and phones are not my first choice for ALDL datalogging and diagnostics. Android devices with displays, memory, and and file space even close to a cheap laptop are expensive and the Android ALDL software is expensive compared to the free offerings for the PC that have more functionality. If you already own an Android tablet or phone with good screen resolution, enough memory, enough storage, and enough processor speed the software becomes somewhat easier to justify. If you're doing OBD II and CAN the price gets a lot more reasonable because most decent PC based OBD II diagnostics packages are very expensive and the Android packages are not. I don't recommend using USB interfaces with Android yet. There are very fast high quality Bluetooth interfaces for both ALDL and OBD II for not much more money. The Android Bluetooth stacks and the Bluetooth chipsets in most Android devices are very robust and work quite well. It's not as straightforward to use USB Host (USB OTG) interfaces in Android. Not all phones and tablets support the whole USB OTG stack because most consumers are just looking to plug in thumb drives not the serial output from a car or truck. You might have USB OTG with Serial Host mode right out of the box or you might have to root your phone or tablet and hack Serial USB OTG into the kernel along with the Chipset drivers assuming it's even possible. Android also has a limited number of supported USB to Serial chipsets when the USB Serial host is actually installed. It's not just the OS. The application software has to support the chipset too. The cheap Chinese Android tablets and phones are not usually worth getting. Typically the screen pixel density is very low in comparison to decent tablets... Good 10" tablets are 1920x1080 while cheap 10" tablets are 1024x600 same as a quality 7" tablet so text and images end up pixellated and fuzzy. On top of that they are typically filled with poorly replicated chips or blems that didn't make the QC cut. Functionality like Bluetooth and WiFi is adversely affected. Software ALDL
OBD II & CAN
Interfaces Bluetooth & USB 1982-1994 ALDL 12 terminal moulded plugsHopefully this provides a good jumpstart to your search...
__________________
1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials...
And please let us know if and how your repairs were successful. Last edited by hatzie; 02-16-2016 at 10:45 PM. |
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#3 |
Registered User
Join Date: Oct 2010
Location: Ocean Springs, MS
Posts: 1,746
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Re: PC Based ALDL (OBD 1) Diagnostic Software and Interfaces
Lots of good info here. I have used TunerPro and WinALDL with a laptop to read my old ECMs data. They work very well.
__________________
Gary 1971 Chevrolet C/10 1951 GMC 100 1977 GMC C15 1955 Chevrolet 3100 |
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#4 | |
Moderator
![]() Join Date: Oct 2008
Location: Wentworth, NH
Posts: 4,950
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Re: PC Based ALDL (OBD 1) Diagnostic Software and Interfaces
Quote:
Right now is the time to get a good Windows XP laptop with USB ports to run this kind of ALDL & OBD II software. There are so many of them dropping on the used market that the prices for complete, tested, ready-to-go units are between $50 & $150 with tired batteries. You want them to have tired but working batteries because it proves the charge circuit works.
__________________
1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials...
And please let us know if and how your repairs were successful. |
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#5 |
Registered User
Join Date: Oct 2010
Location: Ocean Springs, MS
Posts: 1,746
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Re: PC Based ALDL (OBD 1) Diagnostic Software and Interfaces
I have a laptop with Windows 7 that I got from a friend. It works great with Tunerpro. I have a burner that I got from Moates, and I can edit the bins in my TPI ECMs, but it doesn't work with TBI chips.
__________________
Gary 1971 Chevrolet C/10 1951 GMC 100 1977 GMC C15 1955 Chevrolet 3100 |
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#6 |
Windy Corner of a Dirty Street
Join Date: Jun 2003
Location: Pueblo West, Colorado
Posts: 2,926
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Re: PC Based ALDL (OBD 1) Diagnostic Software and Interfaces
Great info!
I use the OBD Diagnostics, Inc. All-In-One tool along with their OBDI, OBDII and MEFI-4 cables as well as genuine GM Tech II scan tool to talk to both OBDI and OBDII. I use the Tech II most often but I use the OBD Diagnostics when I am traveling with limited room to carry a big Tech II. As far as software for the OBD Diagnostic, Inc. cables I use ScanTool.net software, DigimotoLite, TunerPro RT and a few others. One of these allows for OBDI data logging as well. I think it is TunerPro RT that will allow me to Data Log. I have no tuning ability and I don’t want any. Tuning is an art left to those that do it on a routine basis. All of these software packages are free and have the ablity to monitor data but cannot command any actions like a Tech II scan tool.
__________________
Current vehicle collection: 1978 Chevrolet K10, 8.1L, NV4500, NP205 1989 Chevrolet Suburban, 8.1L, NV4500, NP241 1993 Chevrolet C1500 Sportside, TBI 7.4L, 4L60E 2001 Chevrolet K2500HD, Ext Cab, SWB, 8.1L, ZF 6 speed 2014 Chevrolet Impala LTZ 3.6L Vortec 8.1L because life is too short to tolerate underpowered vehicles
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