Our V70 is a 2004 so I'm not sure the diagnostics are the same, but ours set a code when the ETM was bad. It is a generic code so it can be read by any code reader.
Remove the unit. Remove the clips that hold the black cover on. Pull the middle gear out ( ours was not timed in any way). See that the teeth on the small gears are good. If they are worn, you can turn the middle gear half a turn. Gently clean the wipers and contacts. Reinstall cover and clips, reinstall, reset codes, see what happens.
Greg
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