This Peugeot Expert van wouldn't crank, I scanned for faults and had no communication with the engine control unit, next I checked fuses and all were ok.
So then I went straight to the ECU and looked at the CAN Bus waveform, it was messy.
The next thing I did was unplug the ECU and the waveform improved, I went on to check for powers and grounds at the ECU,
I was missing a power supply so I jumped the wire with battery voltage.
The waveform improved and the van started, so I just had to find the broken wire.
I soldered the broken wire and cleared the fault codes, the van ran fine.
Thanks for watching.