Should be variable around 50% or about 6.5V. Some engines run better at 45% (mine does), usually indicating a need for new injectors (a later project, probably next year).

Fixed means it's running it open loop mode for some reason.

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!