With Manufacturer's Scan Tool

How to Use the HDS or a Scan Tool

If the MIL (Malfunction Indicator Lamp) has come on




1. Start the engine and check the MIL (A).

NOTE: If the ignition switch is turned ON (II), and the engine is not started, the MIL will stay on for 15 - 20 seconds.




2. If the MIL stays on, connect the HDS or a scan tool to the data link connector (DLC) (A) located under the driver's side of the dashboard.
3. Turn the ignition switch ON (II).
4. Check the Diagnostic Trouble Code (DTC) and note it. Also check the freeze data. Refer to the DTC Troubleshooting, and begin the appropriate troubleshooting procedure. Diagnostic Trouble Code Descriptions
5. If you do not find any DTCs, go to MIL circuit troubleshooting.

NOTE:
- Freeze data indicates the engine conditions when the first malfunction, misfire, or fuel trim malfunction was detected.
- The HDS or a scan tool can read the DTC, freeze data, current data, and other Engine Control Module (ECM) data.
- For specific operations, refer to the user's manual that came with the HDS or a scan tool.

If the MIL did not stay
If the MIL did not stay on but there is a driveability problem, do the Symptom Troubleshooting. Symptom Related Diagnostic Procedures

If you can't duplicate the DTC
Some of the troubleshooting requires you to reset the ECM and try to duplicate the DTC. If the problem is intermittent and you can't duplicate the code, do not continue through the procedure. To do so will only result in confusion and, possibly, a needlessly replaced ECM.