I like most people have now got the dreaded P0410 code. I have a plan, however I have noticed a new situation that did not give the result I would have expected. I may have missed this in all the reading I have done, so can I run it by you all to ask for comment?

known facts:-
The air pump runs as expected, the air pump can be heard to run for 20 seconds or so while the car is at first idle. NO warning light illuminates 90% of the time.
For the other 10% I will be looking at the RCM soldered joints and relays, the main 40A fuse, the earth connector on the motor, the power connector to the motor etc etc.

I have made an assumption that the P0410 error can be triggered by the air pump being seized up, a bad earth connection or a poor power connection. The logic would also indicate that if the earth was missing (broken wire) or the power supply was poor (oxidisation, broken wire, bad RCM) the P0410 code would be set.

Therefore if I disconnect the earth and power connectors from the air pump and fire her up the P0410 code should be set. Not in my case, no code is being set.

Can anybody explain this? Does anybody know what logic is being used to set the code?

Cheers