1998 HiJet van... No Spark

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I have a 1999 1 litre hijet van... there is 12V going into the coil pack, but no spark comes out. I have tried changing the coil pack and ignition module, and the distributor, and even the ECU! all to no avail. Does anyone have any other suggestions as i am getting desperate! It is the 3 cylinder engine. I could really use a wiring diagram of the ignition systen but i can't find one anywhere! Please help!!