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4. OBD II 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
Powertrain 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) L
ocate the vehicle’s 16-pin Data Link Connector (DLC).
3) P
lug into the OBDII cable to the vehicle’s DLC.
4) T
urn the ignition on. Engine can be off or running.
5) P
ress ENTER button to enter Diagnostic Menu. A sequence of
messages displaying the OBD2 protocols will be observed on the
display until the vehicle protocol is detected.
‹
If the code reader fails to communicate with the vehicle’s
ECU (Engine Control Unit), a “LINKING ERROR!”
message shows up on the display.
Verify that the ignition is ON;
C
heck if the code reader’s OBD II connector is securely
connected to the vehicle’s DLC;
V
erify that the vehicle is OBD2 compliant;
T
urn 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.
6) After the system status is displayed (MIL status, DTC counts,
Monitor status), wait a few seconds or press any key for
Diagnostic Menu to come up.
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