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Leak Detection Pump

 
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Old 04 Aug 2004, 06:15 pm
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Default Leak Detection Pump

Turns out that my check engine light was because of a faulty leak detection pump. I have never even heard of this whatever it is. What is it exactly? The dealer said that they didn't have one in the warehouse, and that I would be OK driving it around until the part comes in. What do ya'll think? I really have no idea what a leak detection pump is, so if somebody can clue me in, I'd be grateful.
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Old 04 Aug 2004, 06:33 pm
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Well, he wasn't lying. I just looked it up in my parts manual. It's right there next to the Vapor Canister and listed in the Emission Systems section.
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Old 04 Aug 2004, 06:35 pm
T T is offline
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"Faulty Leak Detection Pump" LOL. Your probably reading the machanics chicken scratch. []LOL[] Possibly translates to Fault: Leak detection in pump circuit. It could be something in the fuel system, since its pressurized. Did they list the Fault Code?
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Old 04 Aug 2004, 07:19 pm
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NO T, I wasn't joking. "PUMP, Leak Detection" Chrysler Part Number 4891 420AA. Part of the Emission Systems.
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Old 04 Aug 2004, 07:44 pm
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Sweet, so it's an actual part, now, any ideas on what it does?
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Old 04 Aug 2004, 07:57 pm
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The LDP is a small air pump. It pressurizes the EVAP & fuel system to make sure there are no leaks. This ensures that no harmfull vapors are escaping to the atmosphere.
So.... it's a pump... and it is used by the PCM to detect leaks...... hence the name Leak Detection Pump.

The whole system is only pressurized to about .5psi, so it's a very small pump.

There's no big surprize that it failed. It has moving parts, electricity passing through it, and it's soaked in 200F+ engine heat. That makes it the most likely to crap out early.
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Old 04 Aug 2004, 09:33 pm
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MX-5, I sure like your concise comments, with the added humor.
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Old 04 Aug 2004, 09:43 pm
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Thanks MX-5, I was hoping you'd chime in. Thanks for everyone elses help too.
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Old 05 Aug 2004, 07:47 am
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Sounds like you could replace it by blowing thru a straw...
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Old 05 Aug 2004, 09:46 am
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Quote:
quote:Originally posted by quicksilverdon

Sounds like you could replace it by blowing thru a straw...
That is EXACTLY how I diagnosed a 99 Toyota Camry with a code for "incorrect purge flow", last Tuesday.
I have a special pump for diagnosing turbo and supercharger boost issues, but it's not very accurate at only .5psi. A straw is much more controllable.
(The Toyota had a faulty vapor management valve switch and disintigrating charcoal canister.)
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