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What's this part?
Okay, so I can't figure out what this part is, nor can I figure out what it does, other than make a noise when the engine starts up, only when it's cold. Once warm it shuts off.
Mike https://cimg8.ibsrv.net/gimg/www.cro...cffde666a6.jpg |
Re: What's this part?
Auxiliary Air Pump.
It's what you (should) hear whining when you start 'er up. For ~ 15 seconds or so. |
Re: What's this part?
This is a smog pump aka secondary air injection pump. The part number is 05098830AA.
Here's what the MB folks say about it: An air pump is used on the vehicle to lower tail pipe emissions on start-up. The Powertrain Control Module (PCM) grounds the Air pump relay control circuit which energizes the Air pump. The PCM also grounds the Air combination valve vacuum control solenoid circuit, which energizes the Air vacuum control solenoid. Vacuum is then applied to both Air combination valve diaphragms which opens the shut off valves. The PCM enables both circuits simultaneously when Air system operations id desired. When the AIR system is active, then Air pump forces fresh air into the exhaust stream in order to accelerate catalyst operation. The AIR combination valves replace the conventional check valves. When the AIR system is inactive the shut off valves prevent air flow in either direction. If you're seeing a Check Engine light or are experiencing hesitation at take off they recommend replacing it. |
Re: What's this part?
Originally Posted by curtisr
(Post 877375)
This is a smog pump aka secondary air injection pump. The part number is 05098830AA.
Here's what the MB folks say about it: An air pump is used on the vehicle to lower tail pipe emissions on start-up. The Powertrain Control Module (PCM) grounds the Air pump relay control circuit which energizes the Air pump. The PCM also grounds the Air combination valve vacuum control solenoid circuit, which energizes the Air vacuum control solenoid. Vacuum is then applied to both Air combination valve diaphragms which opens the shut off valves. The PCM enables both circuits simultaneously when Air system operations id desired. When the AIR system is active, then Air pump forces fresh air into the exhaust stream in order to accelerate catalyst operation. The AIR combination valves replace the conventional check valves. When the AIR system is inactive the shut off valves prevent air flow in either direction. If you're seeing a Check Engine light or are experiencing hesitation at take off they recommend replacing it. The fault does not affect performance at all, you just will not pass any required pollution tests. |
Re: What's this part?
It's a good thing nothings wrong with it, I was just curious what it was.
Thanks guy! |
Re: What's this part?
What if it won't turn off?
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Re: What's this part?
Originally Posted by Clotho
(Post 963586)
What if it won't turn off?
There is NO WAY the issue can be anything other than a stuck relay. The only alternative is that the output transistor on the ECU that pulls that relay in, is bad. So far, in 12 years here, I've not seen that happen. |
Re: What's this part?
Originally Posted by Clotho
(Post 963586)
What if it won't turn off?
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Re: What's this part?
Originally Posted by Clotho
(Post 963590)
cleaning the relay worked. Thanks
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Re: What's this part?
Good morning,
Secondary Air Injection Smog Pump kicked on during the last few minutes of my drive home today, and continue to run after I turned the car off. Disconnected, let cool down, reconnected, but still runs without key in ignition. Please provide a bit more info about resetting relay, or cleaning. Can I still drive it while having PMC reset? |
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