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This article describes a technique for an automotive vehicle technician terminal to measure ignition sparks in an engine, thereby allowing diagnosis of some ignition system faults. (Image Omitted)
English (United States)
This text was extracted from a PDF file.
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This is the abbreviated version, containing approximately
59% of the total text.
Page 1 of 2
Ignition Analysis Attachments
This article describes a technique for an automotive vehicle technician
terminal to measure ignition sparks in an engine, thereby allowing diagnosis of
some ignition system faults.
The method of this disclosure makes use of special probes and a unique
vehicle probe interface (VPI) to acquire secondary ignition voltage signals from
ignition cable(s). Refer to the block diagram in Fig. 1 which shows the VPI and
connections to a probe attachment card in the technician terminal through four
probe lines. Lines labelled "+5V" and "GND" provide power and signal return for
the circuitry on the VPI. The two remaining lines are "conditioned signal" and a
tri- level analog "control" signal which provides "data ready" and "data ready with
Two capacitively coupled clip-on probe cables are used to receive the signal.
One probe is always connected to the #1 cylinder spark plug wire to establish
synchronization of the test equipment with the ignition system firing sequence.
The other probe is connected to the ignition coil secondary wire of the cylinder
Fig. 2 is a block diagram of the VPI. During operation, the VPI samples input
signals and retains the peak voltage readings in a sample-and-hold circuit.
Analysis of peak voltage data, as delivered by the VPI circuit, will yield data
relative to a specific cylinder, thereby allowing the state of the ignition system to