Hi all, I've got few questions about troubleshooting pressure sensing glow plugs on 2011 Insignia, A20DTH.
Symptoms are EM light on and loss of power.
After connecting to diagnostics 2 codes were found.
P03A7 Combustion chamber pressure sensor Cylinder 2 Differential pressure too high.
P03A3 Combustion chamber pressure sensor Cylinder 2 Sporadic fault.
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
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.
Signal wire voltage was 0.6 V with KOEO.
Ground 0.125 V
Power supply 5 V
Here is original capture, sorry can't upload as normal.https://drive.google.com/file/d/0B9tZ5k1aDMHDUkhQNEJFLUFtVnM/view?usp=sharing
Next capture is with engine running on idle, see below.
And original ps data filehttps://drive.google.com/file/d/0B9tZ5k1aDMHDOU9pYWVHcUpjV0U/view?usp=sharing
From frame 11 something changes on both signals, can anyone help me to correctly understand this waveform ?
Thanks in advance.