Diesel common rail has been around for a while now and we are starting to see more and more problems with these systems.
This being the case we use a number of different techniques to diagnose problems.
The pump is the heart of the system, one quick test we perform is cranking pressure generation.
These pumps have to deliver around 250 bar during cranking or the engine will not start.
So this test can be carried out using a scan tool, or scope.
I prefer the scope as I like to measure the time taken to develop this pressure.
The different systems have similar rise times and it can be a good indication of system functionality.
This being the case we use a number of different techniques to diagnose problems.
The pump is the heart of the system, one quick test we perform is cranking pressure generation.
These pumps have to deliver around 250 bar during cranking or the engine will not start.
So this test can be carried out using a scan tool, or scope.
I prefer the scope as I like to measure the time taken to develop this pressure.
The different systems have similar rise times and it can be a good indication of system functionality.
This example from a cp1 Bosch system fitted to a Peugeot Hdi shows a pressure rise of less than 1 sec. You can see the pump strokes contribute evenly this is a good pump, with good primary supply and no excessive leakage from the high pressure components.
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