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Can’t access computer       #: 1407
 Moderated by: Mike69, MaDMaXX,
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 Posted: Tue Nov 20th, 2018 08:32 am
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4.0power
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 just bought a 2003 2.3 duratec auto transmission 131k miles, has a check engine light. Go to scan it, scanner won't link up. Check all the fuses, all are good. I'm using a snap on scanner. The truck starts (although it takes a couple seconds) and runs, shifts fine. What should I do?



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 Posted: Tue Nov 20th, 2018 10:10 am
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410customs

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 Do you have power at the AUX power point?
I would check the fuses again

The OBD2 port gets its power from the orange wire, this is on the same circuit as your cig lighter



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 Posted: Tue Nov 20th, 2018 10:24 am
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 The both of the cig lighters have power to them. I don't know if there is power at the orange wire...



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2002 xlt 4.0 5r55e 4x4 4.10 rear disc brake swap from sn95 **currently swapping in a 5.0***
2003 2.3 2wd 5 speed single cab dropped 9 inches looks like crap rides like crap but for some reason it’s cool to me
2004 gmc 2500hd 6.6 diesel LLY
1989 foxbody 347 stroker t5 trans
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 Posted: Wed Nov 21st, 2018 11:01 am
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410customs

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 Check for 12V at the orange wire on your OBD2 port

You can try putting 12V to the orange wire and see if the scanner powers up and talks to the PCM

or try a different scanner? Could it be an issue with that snap on? I would check the fuses over again real good...use a test light or multimeter make sure the circuits are powered



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 Posted: Wed Nov 21st, 2018 12:27 pm
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 If there is not power at that wire, what do I then do?



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2002 xlt 4.0 5r55e 4x4 4.10 rear disc brake swap from sn95 **currently swapping in a 5.0***
2003 2.3 2wd 5 speed single cab dropped 9 inches looks like crap rides like crap but for some reason it’s cool to me
2004 gmc 2500hd 6.6 diesel LLY
1989 foxbody 347 stroker t5 trans
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 Posted: Wed Nov 21st, 2018 06:10 pm
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410customs

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 You need to check continuity and for dead shorts on the two wires that connect the PCM directly to the OBD port
There are two signal wires for the BUS system a + and a -
They are wound together.

Basically using multi meter, make sure there are no breaks in these two wires between the PCM and the port



See the pink with light blue and tan with Orange?
These are the serial BUS + and - wires
they go directly to your PCM and other modules 

Pins 15 and 16 at your PCM:

Last edited on Wed Nov 21st, 2018 06:14 pm by 410customs



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 Posted: Wed Nov 21st, 2018 07:21 pm
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 I have seen the wires on the back of data link plug become loose. Check the pins



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 Posted: Fri Nov 23rd, 2018 03:23 pm
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 Well, I just got done putting a new heater core in the truck. Hook the battery up, fired it up, no check engine light. And I can now access the computer. Drove it a good 30 miles as well. I'm not sure what's up with this thing lol.



____________________
2002 xlt 4.0 5r55e 4x4 4.10 rear disc brake swap from sn95 **currently swapping in a 5.0***
2003 2.3 2wd 5 speed single cab dropped 9 inches looks like crap rides like crap but for some reason it’s cool to me
2004 gmc 2500hd 6.6 diesel LLY
1989 foxbody 347 stroker t5 trans
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 Posted: Fri Nov 23rd, 2018 04:58 pm
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410customs

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 Self healing trucks!! My favorite kind



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