Manual Autel MaxiScan MS309 (page 15 of 26) (English)

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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) Locate the vehicle’s 16-pin Data Link Connector (DLC).

3) Plug into the OBDII cable to the vehicle’s DLC.

4) Turn the ignition on. Engine can be off or running.

5) Press ENTER/EXIT 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.

9 Verify that the ignition is ON;

9 Check if the code reader’s OBD II connector is securely

connected to the vehicle’s DLC;

9 Verify that the vehicle is OBD2 compliant;

9 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.

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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Autel MaxiScan MS309 Manual

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