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Dear fullfathom,
Good a.m. and may this find you well. The Volvo Tech Manual showing wiring diagrams for the 1993 940s (TP 32208/1), shows that for Bosch fuel management systems, the ECM is grounded to the engine, by a BLACK wire at position #17 on the ECM connector. The wire runs to position #6 on Connector C54 (below the strut housing bracket on the passenger side [US/Canada models]) and thence (so it appears) to the rear fuel rail support bracket, which is atop the intake manifold.
The ECM's signal ground also runs to the engine. This is a BROWN wire, that runs from position #5 on the ECM connector. The wire runs to position 8 on Connector C55 (below the strut housing bracket on the passenger side [US/Canada models]) and thence (so it appears) to the the forward fuel rail support bracket (or something very close to it), which is atop the intake manifold.
For cars with the Rex/Regina fuel management system, the ECM power ground is a BLACK wire at position #19 on the ECM connector, which runs via position 5 on Connector C55, to the same place as noted above (rear fuel rail support bracket). The ECM signal ground is a BROWN wire at position #5 on the ECM connector, which runs via position 8 on Connector C55, to the same place as noted above (front fuel rail support bracket).
Hope this is helpful.
Yours faithfully,
spook
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