Diagnostic Trouble Code Descriptions

To access ATC trouble codes:
1. Connect an analog voltmeter between the ATC diagnostic terminal and the ground terminal of the self-diagnosis connector. The diagnostic connector is located below the glove box.
2. Turn the ignition switch to the ON position.

Fault Code Display (Example):

3. Any trouble codes that are present will be displayed as a pattern of long and short voltage pulses. Long voltage pulses indicate the "tens' digit while the short voltage pulses indicate the "units" digit. Individual digits are separated by a voltmeter indication of 0 volts.

Fault Code Patterns:

4. Compare the pattern displayed on the voltmeter with the pattern listed on the Fault Code Pattern Chart.
5. Proceed to the diagnostic chart indicated by the pattern.