Hi

I have used before, and documented in a topic here, one type of clamp, that may help evaluate common rail injectors:
topic14421.html

You cold also use return pressure pulses analysis:
topic10111.html

I don't know if I can post wiring diagrams in here... It will be easier to explain. But, from the wiring diagram that I have seen, you have 3 feed wires and 7 ground wires to the ECU. E22, A31, B1, B8, B17, A21 and A30 are all ground pins on the ECU. E1 is a feed wire on the ECU, always hot. E2 is a...

The injector is not in the cylinder. The only way I could check this was using a dummy injector, the injector is lay across the cylinder head with a current clamp connected. All fuel pipes are blanked at the rail to maintain a fuel pressure signal. That will isolate the injection event variable. :w...

It could be a plausible explanation I guess, but it looks like you didn't disable injection. The pressure "fluctuation" is way to close to the injection event to not notice it. Try to recapture that with the injectors unplugged. That way we can isolate that variable... By the way, the injection time...

Did you properly check all powers and and grounds on that ECU? Properly for me is with the scope, grounded on the battery terminal, with the engine running, and the symptoms present. It may be a "lifting" ground that is used by the ECU to ground the K-Line voltage (and injectors also?), causing bad ...

Using your crank signal, we can see that the speed of the engine is not the same between cylinders. The engine speed differences, the intake pressure pulses, and the crank pulses, they can all be explained by the low compression in cylinder number 1. The cause of the low compression is something tha...

Try to do that test without having one cylinder disabled.
The extra volume in that cylinder, from the compression hose, could be causing that.

Steeve

Yes, sadly due to "gaps" between buffers, this is not suitable to listen and follow a "conversation", any data missed would be a failure, and render the analysis void. As a quick and dirty, is my CAN signal valid, it's great. I don't think that is such a big limitation. The "initialization" between...

Hi Richard I have never tried a dedicated hardware solution for CAN or K-Line "debugging", but there are a number of manufactures out there that produce dedicated hardware for this type of situation. Maybe the cheapest solution is, as you pointed, the CAN shields for Ardunino or Raspberry Pi. If the...

... At the moment I have not scientifically discarded them, more I have assumed based on the deliberate speed error. (Assumptions and diagnosis do not go hand in hand, I should know that) At 70 mph (Speedometer reading) the front ABS sensors are reading approximately 67-68 mph which is the kind of ...