Connect scan tester to Data Link Connector (DLC) No. 3. See Fig 1. DLC No. 3 is located in fuse box at lower left of instrument panel. Turn ignition on with engine off. Turn scan tester on. Using scan tester manufacturer's instructions, check for trouble codes and freeze frame data.
If scan tester displays UNABLE TO CONNECT TO VEHICLE, DLC No. 3 must be checked. See DLC NO. 3 VOLTAGE & RESISTANCE SPECIFICATIONS . Also see DLC NO. 3 INSPECTION under SCAN TESTER PROBLEMS. If scan tester does not display UNABLE TO CONNECT TO VEHICLE, go to next step.
Record any trouble codes and freeze frame data displayed for system diagnosis. If driveability problem exists and no codes are present, go to TESTS W/O CODES article for diagnosis by symptom.
If any trouble codes are present, perform appropriate diagnostic test. See TROUBLE CODE IDENTIFICATION table. For more information on freeze frame data, see FREEZE FRAME DATA under INTRODUCTION. For information on 2-trip detection logic codes, see TWO-TRIP DETECTION LOGIC under INTRODUCTION.
After repairs for trouble code have been completed, trouble code must be cleared from ECM memory. See CLEARING TROUBLE CODES .

Fig 1: Connecting Scan Tester To DLC No. 3

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

Normal Mode Code Retrieval