Wiggle Test

Continuous Monitor Test (Wiggle Test)

This test is an aid in diagnosing intermittent failures in the sensor input and output circuits. Connect a VOM to the check connector output.

Engine Running

This test allows the technician to enter this mode of Self-Test and to attempt to recreate the intermittent failure. It is necessary to drive the vehicle each time the suspect harness and/or sensor is tapped or wiggled.
If the VOM/ABS light indicates a fault (short or open) the corresponding service code will be indicated. With the knowledge of the affected circuits, a close check of the harness and connectors can be made.

For example:
If a service code 02 was displayed: LF sensor
1. Erase Memory.
2. Visually inspect sensor closely.
3. Enter Continuous Monitor test.
4. Tap on the sensor.
5. Push/pull on the sensor harness connector, do not disconnect.
6. Wiggle harness working from the sensor connector toward the dash panel and from the dash panel to the processor in short sections. Driving the vehicle every time the harness is wiggled.
7. If VOM has not given a positive indication of an intermittent, disconnect the sensor from the harness, carefully. Remove terminals from the connector. Visually inspect terminals at both ends for any corrosion, bad crimps, etc. Reconnect.
8. Disconnect processor from harness, carefully and inspect terminals associated with the sensor being inspected.
9. If the VOM does not give a positive intermittent indication, reconnect the connector and erase the Continuous Test service code.
10. To erase the continuous memory service codes, connect check connector terminal wires "GN/R" and "GN/BK" with a jumper wire. Turn the ignition on. Check that the ABS warning light is illuminated, and wait 1-2 seconds. Turn the ignition switch off. Disconnect the jumper wire. Start the engine and wait for the ABS warning light to go off. Turn the ignition switch off. Rerun Self-Test to verify codes have been erases.