Volvo VNL Service Manual page 51

Group 38 Instrumentation, VNL, VNM
Note: For some instrument clusters, with an input
value of 30 mph, the gauge should read between 29
and 35 mph. These clusters have a stamp marked
"STD" on the lower left side of the cluster (this
stamp can only be seen when the cluster is out of
the dash).
Note: Pointer width should be taken into account for
all accuracy checks. The width of the pointer, as
well as the angle of viewing the pointer, can make
the gauge appear to be inaccurate. Use the center
line of the pointer — not the edge — as the mea-
surement. And ALWAYS be directly in front of the
gauge when checking accuracy. Looking at the
gauge from the side will not provide a true reading.
4 Using the Pro-link, check accuracy with the signal
value going up to 55 mph. With an input value of 55
mph the speedometer should read between the 55
and 58 mph marks (see figure). If there is a reading
below 55 mph, or above 58 mph, the gauge is faulty.
Fig. 58:
Troubleshooting
W3002014
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