We had the hum noise occasionally at stop lights and low speeds so we had the Toyota dealership do the fuel pump resistor fix (TSB EG002-07). I am now hearing the same noise again and I was wondering if anyone had the fix done and is having the same problem. Our RAV4 is a 2007 V6 Limited. It's at 31K so if we took it to another dealership, it would have to be soon.
Fuel Pump Resistor Fix
bac2010
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We had the hum noise occasionally at stop lights and low speeds so we had the Toyota dealership do the fuel pump resistor fix (TSB EG002-07). I am now hearing the same noise again and I was wondering if anyone had the fix done and is having the same problem. Our RAV4 is a 2007 V6 Limited. It's at 31K so if we took it to another dealership, it would have to be soon.
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You might find some on the http://www.rav4world.com/forums/viewtopic.php?t=15116&highlight=tsb+eg00207 and http://www.rav4world.com/forums/viewtopic.php?t=9437&highlight=tsb+eg00207 threads.
Thank you for the links. I had been thinking that the original dealership didn't replace the part but it looks like others are having repeat problems. That dealership didn't want to do it until even after I gave them the TSB! Hopefully the new Toyota dealership we are now going to will be easier to deal with. I wouldn't mind having them replace the part again and see what happens.
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See http://rav4world.com/forums/viewtopic.php?t=21976&highlight=annotated for the part labeled "U", high on the firewall. It seems easy to get to. I don't know what the before and after resistances should be it looked easy to access for measurement. So I measured it on my 2009.bac2010 said:
The resistance was surprisingly low. I measured mine at 226 milliohms (0.226 ohms). That is not normally measurable with a regular ohmmeter. I have a milliohm meter with 4-wire probes (Kelvin clips). My meter is not as good as the $1500 units, but it is good for this kind of thing.
To put this in perspective, 18 gauge wire is about 6.39 milliohms per foot, and 22 gauge is about 16.1 milliohms per foot.
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Is there any chance it is one of those resistors that change value, increasing the resistance as they warm up? Measuring one of them cold can give misleading results.
Carbon said:
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Actually, I am thinking of a ballast resistor, which is deliberately designed to do so. The measured resistance will vary by considerably higher after they have been energized for a minute of two. This is done to provide more amperage for start up, etc. If you measure the resistance with the resistor at room temperature, you will not get a reading that will accurately reflect what the value of the resistor will be in use.
junebug1701 said:
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