OBD

[ivy]

I got a check engine light yesterday. Didn’t have time to get to it until today. I hooked up my reader and nothing. I thought maybe it died or something so I went to Autozone to see if they could get areading. Nothing! He said no power is getting to the reader. I should check all my fuses. I did and they are all okay. Question(s). Where is the wire that gets power to the reader? How can I find out why it’s not working? Can the check engine light be telling me there is no power to the OBD port? Don’t know where to start so I can see what the code is. 🙁

Topic

[Allan]

Hello 🙂
On OBD2 terminal 16 is the power. What car is this?

[ivy]

sorry had to leave. wife had a yard honey do for me. I have the OBD2 (3.0) and it’s an 03 frontier 2.4L. Where is terminal 16 on the truck port or on the reader plug? Where does that wire come from or how could I trace it back to it’s origin to find the fault?

[Pat]

What were you doing when the light came on? bumpy road? smooth road? highway? No power at the OBD port is bad for sure, but don’t forget to investigate the ground for the circuit as well, no power without ground. All fuses have been check and are good? I am not sure if you would have a relay for the OBD or not, but you can check the relays under the hood and see the inside cover for a layout of what they are. I would say the ECU is working if they car runs, so i would probably start with Wiring to the plug, the connections to the fuse block, the relays and so on. After that it probably gets a little more hairy, being that a wiring diagram would probably be required to form an informed search. Key was on during OBD attempt? “sorry had to ask” Wiring can be one of the more tricky problems to trouble shoot, Personally i would just do the basic electrical check type stuff and wouldn’t go any further than that without a wiring diagram. Also if you are using a meter and do something wrong you can blow up your ECU, so do your homework on the subject before you attempt to do much with the wiring. knowledge is power, and its also a time / money saver.

Sorry i couldnt be more helpful

Pat

[ivy]

Thanks Rhage. I was thinking the same thing about using a test meter. Could be disasterous. I’m going to go slow on this one. I think the check engine light is just a P0402 code. I got that a couple of times in the past. I know a few auto repair teachers at the local high schools here. Maybe I will mention this to them. I don’t like to bother them with small stuff but this is a head scratcher. I can’t have the OBD down for too long. Thanks again.

[Author]

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