Question about Toyota Tundra

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I posted on 9-2-10 for wiring diagram for 20105.7l 4wd tundra to locate the signal wire on the 02 senors and also to locate the computor wires for 02 sensors. I have enstalled transitional tecnology LLC HHO kit, so I need this information for the installation of the wideband and quad efie(ELECTRONIC FUEL INJECTION ENHANCER).

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  • toothfairy19 Sep 03, 2010

    The sensors are denso, so are the wires from the computor to the sensors this same color scheme? T hank you. You have been a great help!

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  • Toyota Master
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You have two white or black wires these can be either way round ,and are the return ,now some sensors use three wires and the third wire is your feed ,Now a 4 wire is the same principle but you have two feed wires and the ground ,which again are the black or white cables ,then a grey and another colour these two wires are the pick up sensors which measure the temperature and the flow rate of the gas ,but that is about all i know from the wiring conversion instructions that come in a new O2 sensor box .

Posted on Sep 03, 2010

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  • Toyota Master
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The color code of the wiring may change depending on the brand of the sensors mounted. Toyota mounts its own sensors.

Here the original color codes for factory sensors:

SIGNAL : Blue
GROUND : White
HEATER (Ignition switched +12) : Black
HEATER (Gnd) :Black

In the Toyota three wire sensor signal is black.

there is a less common configuration of Toyota sensor, with two heater wires in White and signal in Black.

Check diagram here for more clarity.

The most important wire for testing purpose is Signal, this determines the sensors' output.
If colors are different, simply found out ground wire with a multimeter, the two heater wires have usually same color code.

In case the car is mounting a different sensor, here general wiring diagram for 4 conn. sensors from different manufacturer. If this satisfies the query, please do not forget to accept the solution.

I posted on 9-2-10 for - e499413.jpg

Posted on Sep 03, 2010

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