Without Scan Tool

Data Link Connector And Junction Block:

Duty Check DLC:

ECM COMMUNICATION
The provisions for communicating with the Engine Control Module (ECM) are the Data Link Connector (DLC), the DIAG SW connector in the junction block and the diagnostic request terminal in the duty check DLC.

DIAGNOSTIC CONNECTOR LOCATIONS
The DLC is located under the instrument panel to the left of the steering column. The junction block is also located under the instrument panel to the left of the steering column. The duty check DLC is located in the left rear of engine compartment near the strut tower.

DIAGNOSTIC TROUBLE CODES
Diagnostic Trouble Codes (DTCs) are stored in ECM memory and can be read through a Diagnostic Scan Tool plugged into the DLC or by counting the flashes of the Malfunction Indicator Lamp (MIL) after grounding the DIAG SW connector or by counting the flashes of a test light after grounding the diagnostic request terminal in the duty check DLC.

DIAGNOSTIC MODE
When either terminal is grounded, the ECM enters its diagnostic mode and outputs DTCs to either the MIL or, if a test light is used, to the diagnostic output terminal of the duty check DLC.