WARNING: This page is about a different car, the 2002 Lincoln Navigator, 2002 Ford Expedition, 2001 Lincoln Navigator, and 2001 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.

Wiggle test is designed to help identify and locate intermittent failures in vehicle wiring harness and system components. Once wiggle test is entered, several inputs and outputs of module are monitored for a change of state. When a state change is encountered, a tone will sound and/or a DTC will be displayed on New Generation Star (NGS) tester. For modules that store DTCs, DTC description will determine an open circuit, short to ground or short to power. By performing wiggle test and pulling on different areas of wiring harness, intermittent open and short circuits can be located and serviced.

Connect NGS scan tester to Data Link Connector (DLC). Turn ignition switch to ON position. Rotate dial on scan tester to DIAGNOSTIC DATA LINK menu and press trigger.
Rotate dial on scan tester to highlight desired module you wish to access and press trigger. Rotate dial on scan tester to highlight DIAGNOSTIC TEST MODES and press trigger. Rotate dial on scan tester to highlight WIGGLE TEST. Press trigger, then press START (button 3).

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

Wiggle Test

Use the Manual With the Right Hardware

When to See a Mechanic

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