dgdsm
10+ Year Contributor
- 173
- 4
- Aug 24, 2008
-
Tarzana,
California
I think there's something funny going on with my OBDII diagnostic port. About a week ago, my 10 year old code scanner stopped working. It looks like there's not enough power from the port to light the LED screen. But my bluetooth ELM327 adapter is working. I was thinking that the code scanner went bad, but today I took it to a smog test shop for a test and he said his machine couldn't read the RPMs through that port. My bluetooth adapter reads this just fine.
A YT video I found says that in some cars the OBDII port shares a circuit with the cigarette lighter, which has actually never worked in my car since I've owned it. I'm wondering why my BT ELM327 device would work but not a direct connection. I learned a bit about the OBDII commands that devices use to talk to the ECU and sent some simple commands a few times, but I don't see how that could have hurt anything.
Does the ECU have a low-power mode? Also, there's no VIN or other identification information in my ECU, so I don't know if it's actually the original one.
Any suggestions would be helpful.
A YT video I found says that in some cars the OBDII port shares a circuit with the cigarette lighter, which has actually never worked in my car since I've owned it. I'm wondering why my BT ELM327 device would work but not a direct connection. I learned a bit about the OBDII commands that devices use to talk to the ECU and sent some simple commands a few times, but I don't see how that could have hurt anything.
Does the ECU have a low-power mode? Also, there's no VIN or other identification information in my ECU, so I don't know if it's actually the original one.
Any suggestions would be helpful.