CHICAGO 98614, Manual

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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.
3.12 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:
9 Verify that the ignition is ON;
9 Check if the scan tool’s OBD II connector is securely
connected to the vehicle’s DLC;
9 Verify that the vehicle is OBD2 compliant;
9 Turn the ignition off and wait for about 10 seconds. Turn the
ignition back to on and continue the testing.
9 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:
9 Press and hold POWER button for at least 2 seconds to reset the
scan tool.
9 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:
9 Check if the scan tool’s OBD II connector is securely connected to
the vehicle’s DLC;