My Bosch Dishwasher does not drain. I checked the full drain path and found no obstruction. I removed the drain pump motor; it shows 16.1 ohms, which the service manual say should be about 16.5 ohms, so I think pump is OK. The manual suggests this may be a timer problem. Is there a way to check the timer or should I just replace it? Also, the manual said this might be a check valve problem, but I can't find the check valve. The DW seems to go through its normal cycle; it just doesn't pump out the water at the end.