Humming noise - Toyota Nation Forum : Toyota Car and Truck Forums
7th Generation (2012+) Toyota Camry Discussion for years: 2012+

 
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post #1 of 6 Old 05-28-2012, 03:13 PM Thread Starter
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Canada Humming noise

First time poster from Canada here, 2012 SE 4 cylinder. Noticed the other day a humming noise from under the rear trunk area, maybe an evap test, seemed to be running for several minutes, I did key on/off and it shut off. How often does this run, is it a battery drainer? PS-love the car!
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post #2 of 6 Old 05-28-2012, 03:47 PM
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Originally Posted by older View Post
First time poster from Canada here, 2012 SE 4 cylinder. Noticed the other day a humming noise from under the rear trunk area, maybe an evap test, seemed to be running for several minutes, I did key on/off and it shut off. How often does this run, is it a battery drainer? PS-love the car!
When I first got my car, I hear a rather loud noise similar to what you described. I'm not sure what it was, and I never heard it again after that one time .

2012 Camry I4 SE
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post #3 of 6 Old 05-31-2012, 12:33 AM
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Quote:
Originally Posted by older View Post
First time poster from Canada here, 2012 SE 4 cylinder. Noticed the other day a humming noise from under the rear trunk area, maybe an evap test, seemed to be running for several minutes, I did key on/off and it shut off. How often does this run, is it a battery drainer? PS-love the car!
same here! about a week ago, i was in the garage waxing the leather seats at night. heard a buzzing noise near the rear of the car. i thought it sounded like someone running an air pump outside to pump up their tires or something. i brushed it off.

last night, i heard the same buzzing noise again. time to investigate. i opened the garage and the neighborhood was peep quiet. it is coming from the bottom rear left of the car! i panicked and what do a guy to do? google!

found similiar reports on Edmonds.com point to fuel evaporation leakage check and it is normal. found on page 19 of owners manual.
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post #4 of 6 Old 01-21-2015, 10:17 AM
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Normal

From 2014 Owners Manual, page 19 of Foreword
From 2014.5 Owners Manual, page 21 of Foreword
Noise from under vehicle after turning off the engine
Approximately five hours after the engine is turned off, you may hear sound
coming from under the vehicle for several minutes. This is the sound of a fuel
evaporation leakage check and, it does not indicate a malfunction.

-------------------------------------------------
From the internet:

The key-off vacuum pump design is Toyota 's latest evaporative emissions system. As its name suggests, it has a vacuum pump that automatically leak-checks the evap system after the vehicle has been shut off.
First, the key-off system performs a leak check when the ignition switch is off. Second, a small vacuum pump (under trunk) creates the vacuum for this leak check. Depending on fuel tank size and fuel level, the vacuum pump usually runs 5 to 10 minutes or less during this test. And yes, the driver can hear the vacuum pump running.

For instance, the typical enabling criteria for a key-off system leak check are:
(a) the engine has been shut off for five hours
(b) the ignition switch is off
(c) engine coolant is 40° to 95°F
(d) intake air is 40° to 95°F
(e) altitude is less than 8000 ft.
(f) battery voltage is 10.50 volts or greater

Toyota has taken two steps to tell the customer that pump operation and therefore pump noise is normal. First, it hangs a warning tag on the shift lever (although no one can be sure how many of the warning tags survive the pre-delivery vehicle inspection). Also, a notice is printed in the owner's manual (that old-fashioned, print-media object hidden inside the glove box).
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post #5 of 6 Old 01-21-2015, 02:15 PM
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Quote:
Originally Posted by wrau0000 View Post
From 2014 Owners Manual, page 19 of Foreword
From 2014.5 Owners Manual, page 21 of Foreword
Noise from under vehicle after turning off the engine
Approximately five hours after the engine is turned off, you may hear sound
coming from under the vehicle for several minutes. This is the sound of a fuel
evaporation leakage check and, it does not indicate a malfunction.

-------------------------------------------------
From the internet:

The key-off vacuum pump design is Toyota 's latest evaporative emissions system. As its name suggests, it has a vacuum pump that automatically leak-checks the evap system after the vehicle has been shut off.
First, the key-off system performs a leak check when the ignition switch is off. Second, a small vacuum pump (under trunk) creates the vacuum for this leak check. Depending on fuel tank size and fuel level, the vacuum pump usually runs 5 to 10 minutes or less during this test. And yes, the driver can hear the vacuum pump running.

For instance, the typical enabling criteria for a key-off system leak check are:
(a) the engine has been shut off for five hours
(b) the ignition switch is off
(c) engine coolant is 40° to 95°F
(d) intake air is 40° to 95°F
(e) altitude is less than 8000 ft.
(f) battery voltage is 10.50 volts or greater

Toyota has taken two steps to tell the customer that pump operation and therefore pump noise is normal. First, it hangs a warning tag on the shift lever (although no one can be sure how many of the warning tags survive the pre-delivery vehicle inspection). Also, a notice is printed in the owner's manual (that old-fashioned, print-media object hidden inside the glove box).
YES, THIS. This has already been brought up many times before, and it's right in the owner's manual. They print those darn things for a reason...

12 Camry SE V6, Barcelona Red
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post #6 of 6 Old 01-31-2015, 03:52 PM
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Just encountered this on 3 day old Camry. I did start reading the owners manual but about half way through I knew how it was going to end, so I put it down.
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