Reading Diagnostic Trouble Codes

1. Connect an analog voltmeter to the diagnostic output terminal (terminal 25) and ground terminal (terminal 4 or 5) of the data link connector.

Caution: In connecting the voltmeter to the ground terminal (terminal 4 or 5), use the special tool [MB991529 (diagnostic trouble code check harness)].

2. Turn the ignition switch to ON.






3. Read the diagnostic output on the basis of the deflection of the voltmeter.

4. Repair the problem location, referring to the diagnostic chart.

5. Erase the diagnostic trouble code by the following procedure.

a. Turn the ignition switch to OFF.

b. After removing the battery cable from the battery terminal for 10 seconds or more, reconnect the cable.

c. Turn the ignition switch to ON and read the diagnostic output to check if a normal code is output.

d. Let the warm engine run at idle for 10 minutes.