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5
Troubleshooting
Section 5 – Troubleshooting
Error Messages
Check the following if an error message displays:
Verify ignition key is in the ON and not in the ACCESSORIES
position.
Make sure Vehicle Diagnostics Cable is attached to vehicle’s data
link connector (DLC) and Tool.
Look at DLC and check for cracked or recessed pins, or for any
substance that could prevent a good electrical connection.
Test for continuity between the DLC wiring and the vehicle
computers. In an extreme case, there may be a broken wire.
Check for bent or broken pins.
With the key on engine off (KOEO), check for blown fuses.
Make sure the vehicle’s control module has a good ground. If the
computer case for the vehicle is grounded, then clean the
connection and apply a conductive (dielectric) grease to the
mating surfaces.
With the KOEO, verify battery voltage is at least 8V.
Verify the control module is not defective. Refer to the service
manual to diagnose the control module.
Tool Does Not Power Up
Review Safety Precautions before troubleshooting. If Tool will not
power up, communicate with vehicle’s control module, pass Tool
self-tests, or functions incorrectly in any other way, do the following:
Check and replace the 9V battery if needed.
Clean the DLC pins.
Disconnect and reconnect DLC making sure it is connected
correctly.
Check vehicle battery to make sure at least 8 volts is present.
Contact customer service.
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