The accelerator module doesn't actually "work" it just fixes the air temp sensor output. So your question is "does the air sensor work the same open and closed loop?" and the answer is no it doesn't. The whole point of the air sensor is to let the ecu calculate the air mass enstering the bike so it can choose how much fuel to inject. In closed loop it just keeps reducing the fual amount until it senses via the O2 sensor the "correct" value for emission purposes. The reason why closed loop cannot be used all the time is because the O2 sensors are too slow to react to the change in conditions and what is needed is a prediction/formula rather than a later actual measurement of exhaust gas and this is what happens open loop. You twist the throttle the ecu reads what inlet air temp is, what the air pressure is calculates the fuel needed and injects it into the cylinder. You decide to cruise and the ecu switches to closed loop, looks at the O2 sensors and reduces the fuel until the O2 sensor detects the correct fuel ratio and then increases it then decreases it and so on to give the on/off o2 sensor output we have seen. So the accelerator mod cons the ecu into thinking the air is cooler and hence more dense this means more fuel can be added which the ecu does but we know that it's not cooler and hence we get more fuel for less dense air which equal a richer mixture and we are all happy
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