Eobd Diagnostics - Sealey VS8801 Manual

4. EOBD Diagnostics

When more than one vehicle control module is detected by the
scan tool, you will be prompted to select the module where the
data may be retrieved. The most often to be selected are the
Power train Control Module [PCM] and Transmission Control
Module [TCM].
CAUTION: Don't connect or disconnect any test equipment with
ignition on or engine running.
1） Turn the ignition off.
2） Locate the vehicle‟s 16-pin Data Link Connector (DLC).
3） Plug the code reader's cable connector into the vehicle's DLC. .
4） Turn the ignition on. Engine can be off or running.
5） Turn on the code reader. Use the SCROLL button to select
EOBD from the Main Screen.(Figure 3.1)
6） Press the ENTER/Exit button to wait for the Menu to appear. A
sequence of messages displaying the EOBD protocols will be
observed on the display until the vehicle protocol is detected.

If the code readerr fails to communicate with the vehicle's
ECU (Engine Control Unit) more than three times, a
"LINKING ERROR!" message shows up on the display.
 Verify that the ignition is ON;
 Check if the code reader's EOBD connector is securely
connected to the vehicle‟s DLC;
 Verify that the vehicle is EOBD compliant;
 Turn the ignition off and wait for about 10 seconds. Turn the
ignition back to on and repeat the procedure from step 5.
 If the "LINKING ERROR" message does not go away,
then there might be problems for the code reader to
communicate with the vehicle. Contact your local
distributor or the manufacturer's customer service
department for assistance.
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