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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 the DLC Cable is attached to vehicle data link
connector (DLC) and Scan 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 computer. In
an extreme case, there may be a broken wire.
Check for bent or broken pins.
With the engine off, check for blown fuses in the vehicle fuse box.
Make sure the vehicle’s control module has a good ground. If the
computer case is grounded, then clean the connection and apply
a conductive (dielectric) grease to the mating surfaces.
With the key on engine off (KOEO), verify battery voltage is at
least 8.0V
Verify the control module is not defective. Refer to the service
manual to diagnose the control module.
Scan Tool Does Not Power Up
Review Safety Precautions before troubleshooting.
If Scan Tool will not power up, communicate with vehicle’s control
module, pass Scan Tool self-tests, or functions incorrectly in any other
way, do the following:
Check and replace the batteries if needed.
Clean the DLC pins.
Disconnect and reconnect DLC making sure it is connected
correctly.
Check vehicle battery to make sure at least 8.0 volts is present.
Contact customer service.
With the engine off, check for blown fuses in the vehicle fuse box.
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