1994 Pontiac Grand Am, GND Waveform

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Posted to the Waveform Library on 8/31/2000

This is a waveform of the voltage drop on the O2 ground wire to the ECM. You can see the large 1.5 volt voltage drop as the harnes was wiggled. The wire was broken inside the insulation.

Vehicle Data

1994 Pontiac Grand Am 2.3L

Engine	2.3 L / 4 cyl
Subsystem	ECM/Inputs/Outputs
Component	GND
Condition	Known Bad

References

TECH: Beginning Basic Oscilloscope Scope
TECHTIP: Lesson learned on a Quad 4 but it was fun.

Vehicle Data

1994 Pontiac Grand Am 2.3L

Engine	2.3 L / 4 cyl
Subsystem	ECM/Inputs/Outputs
Component	GND
Condition	Known Bad

References

TECH: Beginning Basic Oscilloscope Scope
TECHTIP: Lesson learned on a Quad 4 but it was fun.