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Ok thats good, it means that the DME relay is working correctly the first click is closing the contact in the DME relay that provides power to the DME controller. Looking at the diagram power is going on across pins 1 & 3 of the DME relay which energises the coil between those pins and closes the contact to the left of the coil. That puts 12V on to the DME controller on pins 18 and 35 through the red/yellow wires, you can see the wires in your pic. It also puts 12V on to the feed to the injectors through the re/blue wire so you should be able to measure the voltage at the injectors with the key in that position.
The second click is controlled by the DME controller, when it detects that the ignition switch is in the start position it then grounds the black/grey wire at pin 20 which energises the second coil thethe DME relay at pin 8/9 which closes the contact to the right and applies power to the fuel pump through fuse 2 on the red/black wire at pin 4.
When cranking the DME controller grounds (a short pulse) the grey and grey/black wires to energise the injectors making them open. So is there a good 12V supply to the injectors and is there a good pulse across them when cranking? You really need an oscilloscope for the second one, however you can take the battery out and measure the resistance from the relevant pins on the DME relay to the top of the injectors and from the DME controller to the bottom of the injectors. In both cases it should be pretty close to zero ohms.
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