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When you say it won't turn over, you mean that it is cranking but does not fire, or does not even crank?
OK, you said 1.8 so I thought it was a gas- this is a 1.9 turbo diesel with the injection pump on the front of the block?
A couple of "common" issues- the shutoff valve, which is where you would expect a throttle body to be on a gas car- this valve closes when you turn off the car, and then the solenoid is released again- and it should open. Sometimes they get sticky, and stay shut. Operate the diaphragm plunger a few times to make sure it is open. If it is closed you will get no air and it will not start.
Since you say you have no glow plug light, however, it could either be that you have a bad coolant temp sensor (which may allow the glow plug light to come on really quickly) or the glow time relay up in the cowl area in front of the driver (under the wipers, lift the edge of the plastic cover)
OK- let me know what you find, hopefully you have a good local diesel person nearby
Did you get it running? Can it communicate now?
good to hear. What do you mean "soldered" was a joint broken or did he "fix" the relay?