5.3 swap check engine light on

[Ken Davis]

This morning I started my 72 that I recently installed a 5.3. The truck only has the cab installed on chassis. The motor has been running great. This morning it did not want to run so I added some gas. Now the check engine light is on it seems to be running fine. So I plugged my scanner in which I have never done to this truck. The scanner will not come on. The plug on the truck the pink wire is hot. I have disconnected my battery the light is still on. Does anyone have any ideas what to check to make my scanner work. I know the scanner works I checked it on another vehicle.

[68 short step]

there should be 4 wires that are needed on the back of the obd2 port....2 should be black, and they go to ground, then there should be a purple wire, that is your serial data (communicates with your scanner), then the other should be orange, or pink, that wire is + 12volts, when the key is on (somtimes its always +12v tho)

[68 short step]

you will need to check pin #s 2,4,5, and 16, for your setup, id bet...(you never did say the year of engine)

[Ken Davis]

68 short step. I left the battery disconnected for about 30 minutes and the truck was running good and the light was off. My scanner will still not work I have the pink wire hot I checked the two ground wires and my other wire is green not purple do you have any other ideas.

[Ken Davis]

68 short step my motor and computer is a 03. I checked the pink (hot) pin and the ground pins how do I check the pin going to the computer.

[oldspowered67C10]

Do you have power at pin 16?

[Ken Davis]

Yes I have power at this pink pin

[eagleuh1]

Trace the green wire back to the computer connector and verify its in the slot for serial data. Do you have connector pin outs for your harness?
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[68 short step]

if your scanner isnt coming on, then there is a problem with either the power or grounds, either the OBD2 port, or the scanner itself....how you check the serial data wire is doing a continuity test on it....

[Ken Davis]

Thank you 68 short step I have power to the Obd plug and I checked the grounds so I was wondering if the new plug was bad. Where do you buy the new obd2 plugs.

[MrDude_1]

Originally Posted by Ken Davis

Thank you 68 short step I have power to the Obd plug and I checked the grounds so I was wondering if the new plug was bad. Where do you buy the new obd2 plugs.

I always just go to any U-pull-it yard with a pair of wire cutters.

[jd7]

what kind of scanner are you using ? have you tried a different scanner

[Ken Davis]

I think I found my problem my hot wire (pink) is in the #15 plug not the #16. How do I remove the pin without damage.

[Ken Davis]

It is fixed thank you for the help

[oldvolkz]

Originally Posted by Ken Davis

It is fixed thank you for the help

im having the same issue, no power at my OBD2.

can you post of pic to see your set up at your plug?
thanks in advance.
oldvolkz