The purpose of this test is to directly compare the relative positions of the Crankshaft position (CKP) and Camshaft position (CMP) sensor waveforms and features.
These known good waveforms have the following characteristics:
An engine’s CKP and CMP sensors provide the Engine Control Module (ECM) with critical engine speed, position, and timing reference data.
For the engine to function properly, the engine must be timed correctly and the sensors and related apparatus must be fixed in the correct position relative to the crankshaft and camshaft(s).
The measurements in this test allow you to directly compare CKP and CMP sensor waveforms, for example, to check that their positions are fixed, and not moving, relative to each other. The measurements can also be compared to manufacturer data or to known good CKP/CMP sensor waveforms (such as those found within the PicoScope Waveform Library).
PicoScope’s Rulers and Measurements tools enable you to identify in degrees (or the number of teeth) between the relative positions of CKP and CMP reference marks.
You may need to check the individual CKP and CMP sensors are functioning correctly before performing the comparisons in this test. Equally, your system may be fitted with other variations of these timing sensors. In which case, we provide Guided tests to show you how to obtain waveforms from them:
Any misalignment of the crankshaft and camshaft sensors, or related components, can cause symptoms, such as:
Related failures are:
Selection of component related Diagnostic Trouble Codes (DTCs):
This help topic is subject to changes without notification. The information within is carefully checked and considered to be correct. This information is an example of our investigations and findings and is not a definitive procedure. Pico Technology accepts no responsibility for inaccuracies. Each vehicle may be different and require unique test settings.
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