Not to cause problems: But..

Since (quoted from Bosch)
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The engine-management ECU is required to use OBD on-board diagnostic functions to monitor all of the systems and components within the vehicle whose failure could lead to substantial increases in pollutant emissions. An error is present once defined diagnostic thresholds (limits) are exceeded.
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And also from Bosch
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One of the OBD requirements stipulates monitoring for all electrical wiring leading to the control unit....This means that “comprehensive components” are monitored for signal plausibility ...as well as signs of electrical failure...Simple operational checks (black and white tests) only assess the basic operational status of the system or component... etc.
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Is it not simpler to check resistance of the injectors rather than derive how they are functioning later since OBD requirements mandate verifying the wires are monitored?

Granted in OBDII systems, more complex monitoring was required but OBDII does not apply to the LH2.4 system.

I do not have the full book from Bosch explaining how their systems function, but from what I have read and dervied talking with a local Bosch service technician, it would seem rather easy to compare resistance to a known value ( black and white) rather than derive a component failure from other data.

Granted in the OBDII requirements, the ability to compensate for component degredation was mandated which required more complex circuitry and logic derivation, the derivation of a specific fault would be more readily available through the system.

Duane