Building your own breakout box is probably the most economical way to quickly test the D-Jetronic system. While there are many ways to build a breakout box, I opted for the simplest route, where the connections are straight-through, with probe taps. This way I can run the car with the breakout box attached with minimal effect on the system, and use an oscilloscope, DMM, or other instruments to measure parameters and waveforms.
© Paul B. Anders
I can also disconnect the ECU side of the box and test the system components directly. I built the interposer connection by using the plug from a wiring harness and the edge connector from an ECU, both attached to a piece of perfboard. Each banana plug jack is color-coded and labeled for the corresponding function. I will eventually modify the box to split out the ECU and wiring harness sides, which will permit component substitution, and will also enable me to use a contact points simulator and a pulse width meter to emulate the capability of the MPC Analyzer for a fraction of the cost and complexity (see below).
