User Manual

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• • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • Help & Troubleshooting
7
ERROR MESSAGES
• Vehicle Communication Fault
If the tool exhibits a problem when
communicating with the vehicle, a
message displays. The vehicle’s control
module(s) enters into an unrecoverable
state. Press
(17(5 and the tool resets.
• Operating Error or Erroneous Data
An Operating Error or Erroneous Data
occurs if the vehicle’s computer(s) stops
communicating with the tool. When this
happens, the tool prompts you to select
YES to try again of NO to return to the
Function List, or
+(/3 to display Help
messages and then press the
(17(5 key.
Check the following if an error message displays:
❒ Verify ignition key is ON — not in the
ACCESSORIES position.
❒ Make sure the tool’s adapter cable is securely
connected to the vehicle’s DLC.
❒ Examine the DLC closely and check for cracked
or recessed pins, or for any substance that
could prevent a good electrical connection.
❒ Verify that the vehicle you are testing is an OBD II-compliant vehicle. Just
because it has the OBD II J1962 DLC does not mean the vehicle is OBD II
compliant. Inspect the vehicle’s VECI decal for a statement of OBD II
compliance.
❒ Test for continuity between the DLC wiring and the computer. In an extreme
case, there may be a broken wire.
❒ With the KOEO, check for blown fuses. The computer and DLC usually use
separate fuses. If the fuse for the computer is blown, data cannot be
transmitted. The fuses may be located on the fuse block in the passenger
compartment.
❒ Make sure the computer 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 the battery voltage is at least 10.0V; the minimum
voltage to power the computer.
❒ As a last resort, the computer may be defective. Refer to the vehicle
service manual to diagnose the computer.
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