NOTE: After making any repair, perform data link diagnostic test. See DATA LINK DIAGNOSTIC TEST under SELF-DIAGNOSTIC SYSTEM.

Turn ignition switch to LOCK position. Inspect New Generation Star (NGS) tester connector for loose, damaged or corroded terminals. If connector is okay, go to next step. If problem exists, repair connector as necessary.
Inspect Data Link Connector (DLC) for loose, damaged or corroded terminals. If connector is okay, go to next step. If problem exists, repair connector as necessary.
Measure voltage between ground and terminal No. 16 (Light Green/Red wire) at DLC. See Figure . If voltage is greater than 10 volts, go to next step. If voltage is 10 volts or less, repair Light Green/Red wire between instrument panel fuse box and DLC.
Measure resistance between ground and terminals No. 4 (Black wire) and No. 5 (Blue/Yellow wire) at DLC. If both resistance readings are 5 ohms or less, repair or replace NGS tester. If any resistance reading is more than 5 ohms, repair open in Black wire and/or Blue/Orange wire between ground and DLC.

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

Test H: No Module/Network Communication