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Surging high idle with a P1135 code.

Discussion in '1st Gen. Tacomas (1995-2004)' started by Demented1, Mar 16, 2012.

  1. Mar 16, 2012 at 8:55 AM
    #1
    Demented1

    Demented1 [OP] New Member

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    Been have a surging idle for months now and I am fed up.
    This is what I've done so far.
    Clean the TB including taking off the IAC and cleaned.
    Ran SeaFoam through the vacuum lines and in full tank of gas.
    Cleaned the MAF, twice.
    Checked all vacuum line using Propane technique.
    My CEL code is a P1135.
    Would this make my Taco have a high surging idle?
    I know the code is to replace my O2 sensor.
    Would a bad A/F sensor make my truck idle high?
    I may have to bite the bullit and purchase it, but what if the P1135 is something else?
     
  2. Oct 20, 2017 at 10:30 AM
    #2
    frmdstryr

    frmdstryr New Member

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    Did you ever fix this? Same thing here on an 01 tacoma with the 2.7 3rzfe..
     
  3. Oct 20, 2017 at 7:43 PM
    #3
    Glamisman

    Glamisman Well-Known Member

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    old old post but I will blather on...

    The P1135 code is the heated portion of the front O2 sensor(s) malfunction... either shorted or open circuit. The ECM provides the ground and it monitors the voltage that is required to operate the heater portion of the front O2 sensor(s). If a 4 cyl, one front o2 sensor, V6, 2 front o2 sensors duh... anyway, there is a resistance spec for this and it is usually a pretty narrow range of a few ohms, check this first. Then check for 12v at the harness, you are going to have to get a wiring diagram to ID the correct wire(s). The next step is to disconnect the battery and let her sit for some 5 minutes to bleed down any capacitors in the ECM. Locate the ECM and disconnect the plug. The pins/connectors are pretty delicate so dont go poking around with screwdrivers and distort anything. Locate and ID each wire that goes to the O2 sensor you are checking and check for continuity, and shorts... you might have to exercise the harness to see if there are any breaks in the harness that you cant see. If all checks out OK I would check for how good the grounds are for the ECM and follow them to where they actually connect... Check the ground off of the battery to the block, the little ground off of the battery to the chassis, right by the battery and the ground from the firewall to the back of the head/block. The next test requires a decent volt/ohm meter... you will need to check the voltage drop from the ECM ground(s) to the battery... If there is a high voltage drop the ECM gets electronic noise, clutter, confused. This can be eliminated by a new ground wire from the ECM ground point to the negative post of the battery.

    I have had brand new O2 sensors that were "compatable brand" not be compatable... read the many stories on here about that.
     
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  4. Oct 20, 2017 at 8:19 PM
    #4
    frmdstryr

    frmdstryr New Member

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    Thanks for the (quick) reply!

    I followed the test described in the service manual and the sensor is reading open (with a fluke DMM) so it sounds like replacing the sensor should fix it?

    Also, we discovered that the connector for the ECT sensor was broken so I think that's causing the idle issues. Will replace both and see what happens.
     
    Dalandser likes this.
  5. Oct 20, 2017 at 11:44 PM
    #5
    chrslefty

    chrslefty Well-Known Member

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    So the v6;has 2 front o2 sensors and one rear??
     
  6. Oct 21, 2017 at 12:20 AM
    #6
    Glamisman

    Glamisman Well-Known Member

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    yes and no... some have 2 cats depending on year and if for CA or not.
     
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  7. Oct 21, 2017 at 12:46 AM
    #7
    Dalandser

    Dalandser Million bucks short of being a millionaire

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    My 98 has one baby!
     
  8. Oct 21, 2017 at 1:08 AM
    #8
    chrslefty

    chrslefty Well-Known Member

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    I thought that you ment o2 sensors .
     
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  9. Oct 21, 2017 at 9:07 AM
    #9
    Glamisman

    Glamisman Well-Known Member

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    yeah, my bad... late night posting.
     
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