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Scanner won't link to computer
Hi. Not sure what year the motor is because its in a sand rail. Most likely its a 2001. I do know that its a vortec 4.3 v6. Just spent all my money on this 25 year dream, haven't even driven the thing and already having issues. Ran cherry when I bought it and after about 2 weeks of starting it up when friends came by to check out my new toy, the idle starts to intermittently surge. I tried not only hooking up my OBD1&2 scanner but my buddies scanner too and both of them are unable to link up to the computer. Can someone tell me how to troubleshoot this? Scanner powers on when buggy key is turned but cannot link to ECU
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I'm assuming through an installed OBDII port?
Double check that the serial data wire is in the right place on the OBDII port, and hopefully hooked up to the computer as well... On the OBD port, it should be a wire (usually purple, but could be any color really) on the #2 pin as seen below (this is as you would be looking at the plug from the side where you're plugging in a diagnostic tool) https://cimg7.ibsrv.net/gimg/blazerf...ffecd65639.jpg What type of computer is running the system The standard 411 PCM style? https://cimg4.ibsrv.net/gimg/blazerf...64f1383741.jpg Or one of the older styles? https://cimg6.ibsrv.net/gimg/blazerf...8eebca9166.png |
Originally Posted by blazen_red_4x4
(Post 731959)
I'm assuming through an installed OBDII port?
Double check that the serial data wire is in the right place on the OBDII port, and hopefully hooked up to the computer as well... On the OBD port, it should be a wire (usually purple, but could be any color really) on the #2 pin as seen below (this is as you would be looking at the plug from the side where you're plugging in a diagnostic tool) https://cimg7.ibsrv.net/gimg/blazerf...ffecd65639.jpg What type of computer is running the system The standard 411 PCM style? https://cimg4.ibsrv.net/gimg/blazerf...64f1383741.jpg Or one of the older styles? https://cimg6.ibsrv.net/gimg/blazerf...8eebca9166.png https://cimg5.ibsrv.net/gimg/blazerf...165ff5d6b0.jpg https://cimg4.ibsrv.net/gimg/blazerf...4015bfa9a7.jpg https://cimg0.ibsrv.net/gimg/blazerf...c455c1a75b.jpg |
Test for GOOD continuity to ground on pins 4&5 in the OBD2 port. A typical multimeter will give you a continuity tone with anything below 50ohms, but it should be much lower than that for good connections.
Pin 16 should would run straight to the battery in a factory configuration, but being connected to an ignition source isn't going to affect things much. Pin 2 can run to any one of the class 2 data connections on the ECM; two of which would be on connector 4 (BLACK) pins 11 (dark green wire) or 14 (yellow wire) [as referenced from my 2000 service manual anyway]. On a 2000, the yellow wire from pin 14 would typically run to the BCM which I'm not sure your rail has and the dark green wire from pin 11 would run to a splice pack and that splice pack would branch it out to the DLC, BCM, as well as other class 2 data bus communication devices. A 2000 has the same ECM configuration as you have shown in your picture. You're going to need to verify that each pin on the DLC is correctly routed before you'll be able to move forward. The fact that the tool powers up, I'm going to assume that you have power & ground appropriate, but it is still good to double check. The serial data wire is going to have to be verified from point to point, i.e. from one end of the wire at the DLC to the other end of the wire where ever it connects. You could try pulling the ECM connector C4 and testing continuity on pins 11 or 14 from pin 2 at the DLC. If you find continuity to one of these pins you should be good to go. If not, then you need to make some wiring changes to get it connected, IMO. That will require pulling the loom apart to get that wire out and spliced in appropriately. |
What's the chance that's a 95 computer? Maybe someone could verify, but weren't those OBDI, or OBD1.5 as it's referred to as they started using the OBDII diagnostic port even though the computer system was still OBDI? Could be why an OBDII reader can't make since of it.
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Originally Posted by swartlkk
(Post 731963)
Test for GOOD continuity to ground on pins 4&5 in the OBD2 port. A typical multimeter will give you a continuity tone with anything below 50ohms, but it should be much lower than that for good connections.
Pin 16 should would run straight to the battery in a factory configuration, but being connected to an ignition source isn't going to affect things much. Pin 2 can run to any one of the class 2 data connections on the ECM; two of which would be on connector 4 (BLACK) pins 11 (dark green wire) or 14 (yellow wire) [as referenced from my 2000 service manual anyway]. On a 2000, the yellow wire from pin 14 would typically run to the BCM which I'm not sure your rail has and the dark green wire from pin 11 would run to a splice pack and that splice pack would branch it out to the DLC, BCM, as well as other class 2 data bus communication devices. A 2000 has the same ECM configuration as you have shown in your picture. You're going to need to verify that each pin on the DLC is correctly routed before you'll be able to move forward. The fact that the tool powers up, I'm going to assume that you have power & ground appropriate, but it is still good to double check. The serial data wire is going to have to be verified from point to point, i.e. from one end of the wire at the DLC to the other end of the wire where ever it connects. You could try pulling the ECM connector C4 and testing continuity on pins 11 or 14 from pin 2 at the DLC. If you find continuity to one of these pins you should be good to go. If not, then you need to make some wiring changes to get it connected, IMO. That will require pulling the loom apart to get that wire out and spliced in appropriately. |
Originally Posted by blazen_red_4x4
(Post 731973)
What's the chance that's a 95 computer? Maybe someone could verify, but weren't those OBDI, or OBD1.5 as it's referred to as they started using the OBDII diagnostic port even though the computer system was still OBDI? Could be why an OBDII reader can't make since of it.
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does the service engine soon light come on key on, Engine off?
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Originally Posted by kc8oye
(Post 732009)
does the service engine soon light come on key on, Engine off?
https://cimg6.ibsrv.net/gimg/blazerf...ca6c5b82d0.jpg |
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