When you use an OBD2 scanner, like Autel AL301, AL419, AL519, AL619, ML629, MD802, MD808 ... to diagnostic your vehicle, you might have bellow problems. Please check bellow instruction and it might be help.
Trouble one: Vehicle Linking Error?
*A communication error occurs if the scan tool fails to communicate with the vehicles ECU (Engine Control Unit).
You need to do the following to check up:
- Verify that the ignition is ON;
- Check if the scan tools OBD II connector is securely connected to the vehicles DLC;
- Verify that the vehicle is OBDII compliant;
- Turn the ignition off and wait for about 10 seconds. Turn the ignition back to on and continue the testing;
- Verify the control module is not defective.
Trouble two: Operating Error?*If the scan tool freezes, then an exception occurs or the vehicles ECU (Engine Control Unit) is too slow to respond to requests. You need to do the following to reset the tool:
- Reset the scan tool;
- Turn the ignition off and wait for about 10 seconds;
- Turn the ignition back to on and continue the testing.
Trouble three: Scan tool doesn't power up?*If the scan tool won't power up or operates incorrectly in any other way, you need to do the following to check up:
- Check if the scan tools OBD II connector is securely connected to the vehicles DLC;
- Check if the DLC pins are bent or broken;
- Clean the DLC pins if necessary;
- Check vehicle battery to make sure it is still good with at least 8.0 volts.
