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Thread: Lambda sensor switch connection-is this correct?

  1. #1
    Senior Member
    Join Date:  Mar 2016

    Posts:    185

    Lambda sensor switch connection-is this correct?

    Hi folks, I was hoping someone could confirm that the connection below is right for the lambda sensor switch? It's a single wire that splits off the main harness, black plastic casing, about 3/8" wide and an inch long or so? Thanks if so! Trying to button up all that stuff before I put the intake manifold back on.

    IMG_4531.jpg

  2. #2
    Senior Member cis6409's Avatar
    Join Date:  Jul 2011

    Location:  ireland

    Posts:    107

    My VIN:    6409

    Club(s):   (DOC-UK) (DOI)

    Don't think that's right..
    The green double wire (with single spade connector) goes to that lambda thermal sensor.

    Also the other connector for the idle speed speed thermistor should be the same type but black in colour not grey. Grey is for the cpr connector

    Shane
    only from the past can we choose the correct path for the future...

  3. #3
    Senior Member
    Join Date:  Jan 2019

    Posts:    255

    Quote Originally Posted by rjd2 View Post
    Hi folks, I was hoping someone could confirm that the connection below is right for the lambda sensor switch? It's a single wire that splits off the main harness, black plastic casing, about 3/8" wide and an inch long or so? Thanks if so! Trying to button up all that stuff before I put the intake manifold back on.

    IMG_4531.jpg
    IMG_4531.jpg

  4. #4
    Senior Member 82DMC12's Avatar
    Join Date:  May 2011

    Location:  Olathe, KS

    Posts:    1,680

    My VIN:    11596

    I don't want to add to any confusion but here is a picture of my sorted-out valley.

    Two green wires definitely go to the lambda switch.
    Two-pin black Bosch snap-on plug goes to the thermistor
    Three-pin black Bosch snap-on plug goes to the idle speed motor
    Two-pin gray Bosch snap-on plug goes to either the frequency valve or the control pressure regulator. Should be easy to identify because the one that goes to the CPR is on the same wire branch that the blue cold start valve plug and black 3-pin idle speed motor are on.


    PXL_20220122_220204142.jpg
    Andy Lien

    VIN 11596 Jan 1982 build - owned since Nov. 2000!
    Total frame-off restoration completed 2021-2023

    Photography and Backpacking is life.

    Was Fargo, ND
    Now Kansas City

  5. #5
    Senior Member
    Join Date:  Mar 2016

    Posts:    185

    amazing help as usual, thanks folks!!! this has me sorted!!

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