Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSFORD1999MUSTANG GT, 2D CONVERTIBLE, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTCOMMUNICATION DEVICESMODULE COMMUNICATIONS NETWORKSYSTEM TESTSTEST H: NO MODULE/NETWORK COMMUNICATION
1999 Ford Mustang GT, 2D Convertible, Standard
Test H: No Module/Network Communication
1999 Ford Mustang GT, 2D Convertible, StandardSECTION Test H: No Module/Network Communication
- Turn ignition switch to LOCK position. Inspect 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 at terminal No. 16 (Light Green/Red wire) at DLC. See Figure . If battery voltage exists, go to next step. If battery voltage does not exist, repair power distribution circuit as necessary. See appropriate wiring diagram in POWER DISTRIBUTION article in WIRING DIAGRAMS.
- 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 either resistance reading is greater than 5 ohms, repair open in appropriate wire between ground and DLC.
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.