Join the community and post your question. Use our Ask-A-Tech for free now! ASE experts standing by.

Forum > General Smog Check > Question

2000 Nissan Sentra Smog Check OBD Communication Problem

My 2000 Nissan Sentra will not communicate with the smog check machine. The smog tech said it can not be connected to the smog check computer. It's impossible to read it. What should I do? Could it be a fuse maybe?

Answer:

The simplest reason your 2000 Nissan Sentra may have a problem communicating with the smog machine may be loose wiring within the OBD II connector or blown fuse(s). The most complicated fault could be a problem with the Engine Control Computer (ECU). If you can purchase an inexpensive Trouble Code reader go ahead and do so. Try connecting to your Nissan Sentra's ECU via the OBD II connector. If the scanner lights up as it's connected to your Sentra this indicates there is power at the connector and the problem is more then likely with the signal wire between the OBD II connector and the ECU. If the scanner does not light up this might indicate either a loose or disconnected power or ground wire at the connector, and even the possibility of a shorted fuse. Check your Nissan's fuse box for fuses labeled DLC (Data Link Connector) and/or ECU. The fuses should be located on the fuse block behind the coin tray. Our sources indicate Fuse 10 (10A) which is for a green wire to data link connector terminal 8 from ignition switch, and fuse 12 (10A) which is for a red/black wire to data link connector terminal 16 from battery. posted by SmogTips Support

Related questions and answers you might find useful:

How Do I Get a Smog Check Waiver? by Margaret

Do I Need a Smog Check This Year? by Joy

Mini Cooper DMV Registration Due in 5 Day Won't Pass Smog by anne

2001 Jeep Grand Cherokee Laredo with K&N Air Filter by David

1995 BMW M3 Gross Polluter High HC & NO @ 15MPH by Jared

View SmogTips.com in: Desktop / Mobile