Question about 1994 Toyota 4Runner

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1994 toyota pickup, 4x4, 3.0 efi, I need to know the color of the TWO wires that go to the IAT sensor? These wires are intagraded in the connector to the MAF sensor ?

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  • marc003 Jul 07, 2010

    I have added a comment all ready, and i would like a answer, please

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  • Toyota Master
  • 22,246 Answers

If i am not mistaken then these wires can be connected either way around as its only a temperature sensor in the air flow

Posted on Jul 07, 2010

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  • Toyota Master
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The IAT is inside the Air Flow Meter in the air intake and is not serviced seperatly.
Using an ohmmeter measure between terminals THA and E2. Resistance should read:
at -20°C (-4°F): 10 - 20 k ohms
at 0°C (32°F): 4 - 7 k ohms
at 20°C (68°F): 2 - 3 k ohms
at 40°C (104°F): 0.9 - 1.3 k ohms
at 60°C (104°F): 0.4 - 0.7 k ohms

If reading is out of specification. it will be necessary to replace the Volume Air Flow Meter assembly. Also, I suggest check this wiring diagrams...

1994 toyota pickup, 4x4, 3.0 - bb7a2e6.jpg

Fig. 28: Engine wiring-Pick-Up 1991-95 6-cylinder


dd8e223.jpg

Fig. 31: Chassis wiring-Pick-Up 1990-95




1994 toyota pickup, 4x4, 3.0 - 5cd134f.jpgttp://i.fixya.net/uploads/images/5cd134f.jpg" alt="5cd134f.jpg" class="h_mi" />


Fig. 32: Chassis wiring-Pick-Up 1990-95 continued




Hope helps.

Posted on Jul 06, 2010

  • marc003 Jul 06, 2010

    Thank you, but I need more info about this. I'm installing a [performance modual] and it calls to be installed by connecting the 2 wires from this chip [modual], to the wires of the IAT sensor ? how can I find which 2 wires are for the IAT ?

  • ZJ Limited
    ZJ Limited Jul 07, 2010



    To test the IAT use this diagram and instructions...




    In this cases, one BOSS Performance Module, the instructions says to connect it to
    the two wire IAT sensor with scotch locks that were provided. So, the THA is one side of the IAT and the other is the E2 in the
    connector diagram. Throw the scotchlocks as far as you can and give this
    half a chance to work by soldering the wiring. Scotchlocks **** and
    make problems down the road.
    E2 is Earth or ground THA is
    the signal to the PCM. THA is yellow with a green tracer (I think)

    Good
    luck with it.

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