Continuous Monitor Diagnostic Mode (Wiggle Test)

KEY-ON/ENGINE-OFF CONTINUOUS MONITOR (WIGGLE) TEST

This test is intended as an aid in diagnosing intermittent failures in the sensor input and output circuits.

To perform this test connect a suitable volt/ohmmeter or star tester to the self-test output.

To enter this test mode, turn key to On position. Self-test output will be activated whenever a continuous fault is detected and if the duration is long enough, a fault code will be indicated.

Engine Running Continuous Monitor (Wiggle) Test

The continuous monitor wiggle test will allow you to enter this mode of self-test and to attempt to recreate the intermittent failure tap, move, wiggle the harness and/or the suspected sensor. If the volt/ohmmeter or star tester indicates a fault (short to ground or open circuit) the corresponding service code will be indicated. A close check of the affected circuit harness and associated connectors can be conducted. Remember to keep your eyes on volt/ohmmeter or star tester for any change which will indicate where the intermittent is located.

Continuous Monitor Test

For example, if service code 09 was displayed: Engine Coolant Temperature Sensor, proceed as follows:
1. Visually inspect the sensor very closely.
2. Enter the continuous monitor test.
3. Lightly tap on the sensor.
4. Push/pull on the sensor harness connector (do not disconnect).
5. Test and wiggle (shake) harness vigorously, working from the sensor connector toward the dash panel and from the dash panel to the processor in short sections.
6. If the volt/ohmmeter has not given a positive indication of an intermittent, disconnect the sensor from the harness as carefully as possible. Remove terminals from the connector. Visually inspect terminals at both ends for corrosion, bad crimps or improperly seated terminals.
7. Connect after inspection.
8. Disconnect processor from harness as carefully as possible.
9. Inspect terminals. Only remove terminals associated with the sensor being inspected.
10. If the volt/ohmmeter does not give a positive indication, connect electrical connector and erase the continuous test service codes.
11. To erase the continuous memory service codes, initiate Key-On/Engine-Off self-test. Unlatch the push button on the STAR tester as soon as the first service code is received. Disconnect negative battery ground cable and depress brake pedal for 5---10 seconds. Repeat self-test to verify service codes have been erased.