Sealey VAG505 - Manual (Page 18)

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For your vehicle to be OBD II compliant it must have a 16-pin DLC
(Data Link Connector) under the dash and the Vehicle Emission
Control Information Label must state that the vehicle is OBD II
compliant.
3.8 Product Troubleshooting
Vehicle Linking Error
A communication error occurs if the scan tool fails to communicate
with the vehicle’s ECU (Engine Control Unit). You need to do the
following to check up:
 Verify that the ignition is ON.
 Check
if the scan tool’s
connector is securely
connected to the vehicle’s DLC.
 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.
Operating Error
If the scan tool freezes, then an exception occurs or the vehicle’s
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.
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 tool’s connector is securely connected to the
vehicle’s 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.