Reading and Clearing Diagnostic Trouble Codes

HOW TO READ DIAGNOSTIC TROUBLE CODES
When using the scan tool




1. Connect the scan tool to the data link connector.

CAUTION: Turn the ignition switch OFF before disconnecting or connecting the scan tool.




2. With the ignition switch in the ON position, turn the auto-cruise control main switch to ON and take a reading of the diagnostic trouble codes.




When using a voltmeter
1. Use the special tool to connect a voltmeter between the ground terminal and the diagnostic output terminal of data link connector.
2. In the same way as when using the scan tool, turn the ignition switch to ONand turn ON the auto-cruise control main switch. Then take a reading of the diagnostic trouble codes from the movement of the needle on the voltmeter.




HOW TO READ DIAGNOSTIC TROUBLE CODES FROM A VOLTMETER

HOW TO ERASE DIAGNOSTIC TROUBLE CODES
The diagnostic trouble codes can be erased by disconnecting the (-) cable from the battery for 10 seconds or more and then re-connecting it, or by the following procedure.
1. Turn the ignition switch to ON.
2. With the SET switch at the ON position, turn the main switch to ON, and within 1 second after this, turn the RESUME switch to ON.
3. With the SET switch once more at the ON position, turn the stop light switch ON for a continuous period of 5 seconds or more.




HOW TO READ INPUT SWITCH CODES
1. Connect the scan tool or a voltmeter to the data link connector.
2. With the ignition switch in the ON position, turn the SET switch to the ONposition.
3. Within 1 second after turning the auto-cruise control main switch to ON, turn the RESUME switch to ON.
4. Operate each switch listed in the input inspection table and take a reading of the input switch codes with the scan tool or the fluctuation of a voltmeter.

NOTE: These codes are output as voltage waveforms in the same way as above.




Input Inspection Table