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6.5L Diesel Engine Discuss the 6.5 GM diesel engine & associated components. Automatic transmission questions & problems belong in the 4L80/85 - 4L60E - 6L90 Transmission Forum

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Old 01-21-2015, 11:39 PM   #1 (permalink)
quadstar87
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Scan your OBD-I 6.5 for $2.55

FYI, the absolute cheapest way to scan your 94-95 Truck

*Notice: You need GMTD Scan Tech PRO to send commands such as TDCO Learn or injector balance tests (that isn't free)

What you need:
They are two of the wires in the RS232 (serial data) adapter you use to communicate with the PCM. Our PCM's are fairly forgiving so we don't need fancy adapters to connect up.

In the following ALDL pinout, you connect:
  • RX/TX to M (Serial Data)
  • GND to A (Ground)

(use your imagination here, you can solder to paperclips and shove them in, use an ALDL connector you have laying around, or tap directly into the corresponding wires in the ALDL plug)
aldl.png

Now, Open GMTD Scan Tech Basic and make sure you settings are for COM# your adapter is recognized on your computer, and the baud rate = 8192.


Here's what the cable looks like when you get it. I didn't list any wire colors since they might vary per manufacturer. The auction should tell you what is what:
IMAG1099_zps2ptigsgj.jpg

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Last edited by quadstar87; 01-21-2015 at 11:41 PM.
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Old 01-22-2015, 03:58 AM   #2 (permalink)
Rattler1
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Interesting.

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Old 01-22-2015, 04:36 AM   #3 (permalink)
Crazyxxxinsane
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omfg sweeet, i have tons of usb cables laying around here lol. im goinna try this considering most ALL usb cables have same colors as this one, 2 5+V, gnd, term, data
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Last edited by Crazyxxxinsane; 01-22-2015 at 04:38 AM. Reason: didnt add something
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Old 01-22-2015, 05:43 AM   #4 (permalink)
VegasMatt
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Quadstar, thanks for the link, and info! That is WAY cleaner than my current arduino cable solution. (The "scan for less than $10" version)

Quote:
Originally Posted by Crazyxxxinsane View Post
omfg sweeet, i have tons of usb cables laying around here lol. im goinna try this considering most ALL usb cables have same colors as this one, 2 5+V, gnd, term, data
Actually, that will not work. What quadstar posted above is a USB cable with an integrated USB to RS232 serial adapter "bridge" built-in. Looking at that cable, it is likely in the USB plug end.

The trucks don't "speak" USB, and won't be able to communicate to the computer without an "interpreter/translator" (the serial bridge in this case.)

I would not attempt just hacking the end off a USB cable and plugging it into the truck, as who knows what it may do to the PCM.

Matt
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Last edited by VegasMatt; 01-22-2015 at 05:45 AM. Reason: Added line 1.
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Old 01-22-2015, 06:56 AM   #5 (permalink)
JCDiesel
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Im a sucker. Spent like $45 for a cable online.
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my guess would be shocks
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Old 01-22-2015, 07:55 AM   #6 (permalink)
Crazyxxxinsane
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Them bastards lol
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Old 01-22-2015, 09:41 AM   #7 (permalink)
quadstar87
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Quote:
Originally Posted by JCDiesel View Post
Im a sucker. Spent like $45 for a cable online.
There's something to be said for that approach also. If you figure in the time you saved, it's about the same, and you can plug it right in and go.
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Old 01-22-2015, 09:43 AM   #8 (permalink)
quadstar87
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Quote:
Originally Posted by Crazyxxxinsane View Post
omfg sweeet, i have tons of usb cables laying around here lol. im goinna try this considering most ALL usb cables have same colors as this one, 2 5+V, gnd, term, data
As mentioned above, this won't work. If you look at the photo of my cable above, you can see the other chips inside the connector which are the RS232 logic pieces. You're on the right track though!
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Quadstar Tuned '98 K3500 CCLB DRW 6.5TD 4L80E. DS4-5068S. Fully studded 506 with Optimizer heads.
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Old 01-22-2015, 10:36 AM   #9 (permalink)
90GMC62L
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So I got a question, my buddy has a ALDL cable for his '89 Trans Am for data logging, it also works on my '93 bird. Would that work on my '95 truck then too I assume? All are obviously OBDI. Then I could do it for free.
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Old 01-22-2015, 10:39 AM   #10 (permalink)
quadstar87
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Quote:
Originally Posted by 90GMC62L View Post
So I got a question, my buddy has a ALDL cable for his '89 Trans Am for data logging, it also works on my '93 bird. Would that work on my '95 truck then too I assume? All are obviously OBDI. Then I could do it for free.
It depends. Some of them are re-wired to work with different ECU's or use multiple pins in the ALDL plug. It should work though, you aren't hurting anything to try it!

See if it has a switch on it to switch modes or post up a brand/part# on it.

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Quadstar Tuned '98 K3500 CCLB DRW 6.5TD 4L80E. DS4-5068S. Fully studded 506 with Optimizer heads.
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