Troubleshooting
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9
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 OBD II Cable is attached to vehicle’s 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 key on engine off (KOEO), check for blown fuses.
❒ 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 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 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 8.0 volts is present.
❒ Contact customer service.
