19
5.
OBDII Diagnostics
The OBD II Diagnostics function is a fast-access option that allows
you to carry out a quick test on the engine system of OBD II
vehicles.
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 scan tool cable connector into the vehicle’s DLC.
4
）
Turn the ignition on. Engine can be off or running.
5
）
Turn on the scan tool. Select
OBDII
from the
Main Screen
.
(Figure 3.1)
6
）
Press the
OK
button to wait for the Menu to appear. A sequence
of messages displaying the OBDII protocols will be observed
on the display until the vehicle protocol is detected.
If the scan tool 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 scan tool’s OBD II connector is securely
connected to the vehicle’s DLC.
Verify that the vehicle is OBD2 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 scan tool to communicate with
