Question about BMW 328
Wont communicate with obd2 for inspection nys
Posted by Anonymous on
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Posted on Jan 02, 2017
SOURCE: OBD Communication
OBD stands for on board diagnostics.it could either be a connector problem or a computer problem.take it to your local parts store and have them hook up a tester for free.if the computer is dead take it back to the dealer it should still be under warranty.thanks for using fixya.
Posted on Aug 30, 2008
OBD II connector troubleshooting 101
I had the same problem with my 2000 Elantra. the OBD II connector pins get squished and won't make cantact with the scan tool, therefore no connection. the solution is to bend the pins back so they will connect to the scan tool.
FIRST! check your lighter and radio fuses (which you have already done). If possible, make sure your scan tool is working properly, try it on another car. If it is functioning properly, remove the 2 screws holding the obd II connector to the dash. Look for obvious signs of corrosion, damage, or stuff that shouln't be in the connector (rocks, gum, etc.) clean the connector with a good electronics cleaner (I use the CRC stuff), you can usually find it at you local parts store, radio shack, or even wal mart. hose down the inside of the connector thouroughly and allow time to dry.
check for voltage between 4 (gnd) & 16 (+vcc) then 5(gnd) and 16(+vcc) with the ignition on the voltage should be between 12v-16v (these pins may be different on other cars, look for an OBD II connector pinout diagram if your car is different). If this voltage is not present at either pin, the problem is not the connector. check your fuses and wiring. if this voltage is present at both pins continue.
Here's what I did. with the connector free from the dash, you can see the back of the connector where the wires enter the connector. on either side of the connector there may be a white clip. pop both of them off. you should be able to push a small screwdriver or pick in that space to pull the pins back out towards the outside of the connector. do one at a time so you can tell if the pin has moved back out into position. do this for all of the pins. Try to connect. if still no luck try again to push out the pins and reconnect.
If your connection is restored, replace the clips, screw it back into the dash. Return your car to the lousy DMV where they will proceed to tell you something else is wrong which they neglected to tell you on your first 10 visits!! :-)
Stuff thats good to know:
some auto parts stores will connect their OBD II scan tool to you car for free. auto zone is one place
some times the computer will need to reset to restore a connection to the scan tool. to do this simply cycle the ignition off (wait a few seconds) then on again.
online auction places are a excellent resource for USB to OBD II connectors to connect your laptop to your car. there is lots of OBD II diagnostic freeware out there to go with your newly purchased connector.
Posted on Feb 06, 2009
it is in the fuse block inside the car drivers side and is marked ecm or pcm I think it is a 7.5 amp fuse, pull off the cover and you will see the fuse there.
Posted on Aug 31, 2009
Testing your OBD2
Before You Begin
Since all vehicles are not the same please refer to the manual supplied with the OBD2 code reader for vehicle specific instructions.
Is your vehicle compliant?
All cars and light trucks manufactured since late 1995 should be OBD2 compliant. Two factors will show if your vehicle is definitely OBD2 equipped:
Pin 2 - J1850 Bus
Pin 4 - Chassis Ground
Pin 5 - Signal Ground
Pin 6 - CAN High (J-2284)
Pin 7 - ISO 9141-2 K Line
Pin 10 - J1850 Bus
Pin 14 - CAN Low (J-2284)
Pin 15 - ISO 9141-2 L Line
Pin 16 - Battery Power
Where is the connector located?
The connector must be located within three feet of the driver and must not require any tools to be revealed. Look under the dash and behind ashtrays.
Important info about OBD2
Connecting the OBD2 Code Reader is as simple as locating the DLC connector. The DLC connector is usually found under the driver side (left side) of the dash. The cable attaches only one.
Reading the LCD Display
Click to enlarge
Before you start testing, take a good look at the LCD display. The illustration above explains what the various icons mean and how the DTC (Diagnostic Trouble Code) will be displayed. The unit is self-powered by three-AAA batteries and will let you know when they are running low. When connected/receiving power from the vehicle, the CAR Icon will display.
The OB2 code reader is a very simple tool to use. Once it is connected, turn the power on. Once the ignition is switched to the on position, the code reader is checking the system for any stored DTCs.
The meaning of each DTC can be found in the manual supplied with your code reader.
Example: the code reader displays a DTC PO309, Cylinder 9 misfire was detected.
P0298 Engine Oil Over Temperature P0300 Random/Multiple Cylinder Misfire Detected P0301 Cylinder 1 Misfire Detected P0302 Cylinder 2 Misfire Detected P0303 Cylinder 3 Misfire Detected P0304 Cylinder 4 Misfire Detected P0305 Cylinder 5 Misfire Detected P0306 Cylinder 6 Misfire Detected P0307 Cylinder 7 Misfire Detected P0308 Cylinder 8 Misfire Detected P0309 Cylinder 9 Misfire Detected P0310 Cylinder 10 Misfire Detected P0311 Cylinder 11 Misfire Detected
Once you know what the problem is, you have to determine what's causing it. In this case the intake manifold gasket was faulty. Once the repairs have been made, it is time to clear the DTC and check the system to verify the repair.
Clearing the Diagnostic Trouble Code (DTC)
Clearing the DTC is very simple. Press the ERASE button on the code reader. A message will display on the screen; "SURE" for conformation. If you wish to clear the DTC press and hold down the ERASE button again until a message appears on the screen "DONE". If you did not wish to clear the codes and hit Erase by mistake at the screen message "SURE" simply press the link button to return without erasing any DTCs.
When you clear the DTC(s) from the PCM (Power train Control Module)you also clear ALL of the other gathered information that the PCM has collected, including Freeze Frame, Drive Cycle data, manufacture specific enhanced data end everything stored in memory is erased - just like if you cleared the Cache files on your PC.
The vehicle's PCM will need to re-learn the information that was erased. Don't be alarmed!! This is easily accomplished just by driving the vehicle. All you have to do is get driving.
Good luck and check the OBD 2 connection port.
Posted on Dec 02, 2009
Testimonial: "thank you for your help, this was a little too technical for me but it did take me to the fuse for the conncector which was the problem. what a help"
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