Next I've checked live data parameters on idle,
Cyl 1 average 3.8 MPa
Cyl 2 average 3.3 MPa
Cyl 3 avarege 3.9 MPa
Cyl 4 average 4.1 MPa
Combustion chamber pressures KTS
Yes, cylinder 2 looks lower than other 3.
Left with possibilities I've decided to scope it versus starter current to eliminate low compression, but before this was done quick voltage check.
PSG wiring identification
Signal wire voltage was 0.6 V with KOEO.
Ground 0.125 V
Power supply 5 V
No, I haven't done anything except scoping the signal, I've got no evidence this plug is at fault.
I had very little time with the car and it is no longer in the garage.
I've been looking online to find some information about the waveform but all I can find is glow plug manufacturer's pdf documentation with all the specs etc.
This document might help you in your trouble shooting of your Insignia car.
What Robski is saying about cleaning the PSG may be the answer to your troubles, if you read the document, where the root cause to this problem seems to be soot contamination on the pressure sensor glow plug.
Thanks, very interesting approach by Vauxhall.
I wonder if there has been any revisions to this bulletin.
At the moment I'm trying to find the way of correct interpretation of waveforms, If the car will get back to me I'll try to take another capture with crank sensor and injector currents.
I hand the chance to see this car back, codes still present so I decision was made to replace the glow plug with new one Beru part.
After fitting new PSG one of the fault codes came back straight away, P03A7, it cleared but after running the engine on idle it was coming back.
I had no choice, took it for road test, EM light wasn't on and engine was performing good so it was taken by customer.
Now the funny thing.
Yesterday this car came back with EM light on and complaint for loosing power etc, plugged it in again and P03A7 still present as well as new code for air flow meter performance.(Sorry I havent got the code number at the moment)
Anyway the problem was very common issue on these engines, split turbo hose between intercooler and air intake pipe.
I've replaced the hose and road tested the car, plugged it in to check the codes and there was no codes stored.
Again, I didn't have much time but I've scoped this cylinder this time DC voltage vs injector current to see sensor's reaction for fuel injection.
Hi all, its been a while since I had this car in and to be honest the only fault I have rectified was split turbo hose.
It is possible that the cylinder 2 combustion pressure was slightly lower because of split turbo hose, this car never came back to me after I've replaced the it.
Thanks
Greg