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[Solved] MIL on '06 Mazda 6, Leak Detection Pump Failed?


Topic starter

I have a 2006 Mazda 6, 2.3L 4-cylinder NA engine. A few days ago, my MIL turned on and I pulled the DTCs to get P2402 "EVAP System Leak Detection Pump Control Circuit High". As far as I know, I think there's a pump that pulls a vacuum on the evap system to ensure that there isn't a leak. It seems to be reporting too high a voltage back to the ECU, possibly indicating a failed pump, a shorted wiring harness, or (hopefully not) a failed ECU circuit. I've checked a workshop manual that I have for the car, but the workshop manual is apparently for the UK and European versions of the Mazda 6 (I'm in the US), and that manual doesn't indicate a leak detection pump around the EVAP system.

Now, the "helpful" folks at AutoZone seemed to think I was talking about some kind of exhaust leak into the coolant and wanted me to rent their exhaust leak detector (even after I showed them the code)... but I don't think this has anything to do with the DTC.

At O'Reilly, they helped me find this part which looks about right, but they couldn't tell me where it's located or any other information about it.

So here are my questions:

1. Have I correctly deduced that there is a specific leak detection pump that might have failed?

2. Can anyone tell me anything about that pump? Where is it? If I pull it out, what would I be looking for to determine if it's failed?

Thanks for any help you can provide. 

2 Answers

Well according to my all data system you have to drop the gas tank and the stupid thing is hiding on top of the gas tank.


Ta-Da! another computerized piece of crap bites the dust! when will we ever learn?

I know! There's nothing I love more than spending my weekends cleaning and tuning carbs, adjusting distributor timing and filing the points, adjusting throttle valves and cables, adjusting cylinder valves/rockers, just so I can get to work on monday. Smile Oh and the joys of driving a manual in morning rush hour is simply the best.