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Panelmon,
Per Volvo green manual:
DTC 311
If the engine speed is over 2100 rpm, the load signal is in the part-load range and the control module does not receive a signal from the speedometer for 8 seconds the DTC is logged.
Causes of fault:
Break or grounding in the wiring from the combination instrument.
Break or grounding in the wiring between the combination instrument and the sensor.
Fault symptoms:
Idling problems.
Also the oxygen sensor should oscillate between .1 and .9v fairly quickly.
Hope this helps,
Ron J
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