Grounding

M52 Gnds: MOT88/ 4, 7, 28, 32, 34, 38, 39, 40, 41, 42, 43, 56, 58, 63, 67, 70, 71, 72

* please check by measurement (harness and ecu pins) Pin63 is optional. Some gnd pins in harness have no connectivity, are only connected by ecu pin

* ECU passed all functional tests (including main relay and fuelpump p259 outputs)

** needless to say, grounds were connected during HW-tests (eg. the signalgenerator is grounded to the other grounds of test-bench)

Check just in case:

* BMW88/43 must be grounded (connected to BMW88/34 in ECU) if it is not grounded in harness and DVM diode measurement shows more than 0mV between these 2 ECU pins also

** otherwise the harness is not compliant with the GenBoard/Manual/GroundConnections and p259 might be damaged

** EC36/26 GND connected to GND5 inside all BMW M52 ECU (double-test this)