Search history for D-Jet (D-Jetronic) threads.
There is a US service manual CD that has the troubleshooting steps for the system in general if you know how to use a multi-meter. The same CD also has the schematics.
A paper copy of the M117 cast iron 4.5l service manual would also have all of the above, if you should come across it.
HTH -CTH
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