For 1990-2009 cars

Step | Action | Normal Result(s) | Abnormal Result(s)*
--- | --- | --- | ---
1 |

1. Connect a scan tool to the data link connector (DLC).
2. Turn the ignition switch to the RUN position.
3. Turn on the scan tool.

Scan Tool turns on

Scan Tool Inoperative

2 | Use a scan tool in order to communicate with the inflatable restraint sensing and diagnostic module (SDM), the EBCM (if equipped) and the PCM. | Communication is established between the scan tool and the modules. | Scan Tool Does Not Communicate with UART Data Line
3 | Use a scan tool in order to communicate with the Powertrain Control Module (PCM) Class II serial data line. | Communication is established between the scan tool and the PCM. | Scan Tool Does Not Communicate with Class 2 Data Line
* Refer to the appropriate symptom diagnostic table for the applicable abnormal result.