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Thread: ID sender unit.

  1. #1
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    Default ID sender unit.

    Can you Isuzu boffins help ID these two sender units please. There is one on top of the housing with no connecting wire and another below on the side of the housing as seen my finger pointing to in the pic also not connected. What confuses me is that the heat gauge works so what then are these 2 sender units for?
    Isuzu KB250.
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    Last edited by Sneaky Pete; 2021/04/22 at 11:24 AM.
    Peter
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  2. #2
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    Default Re: ID sender unit.

    Its possible that the housing is generic and now sender units are installed to plug the holes, although it would be stupid to use such expensive plugs. The sender unit that's in use might be on the cylinder head.
    Current - 2009 Mazda BT50 3.0CRDi 4x4 d/c
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  4. #3
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    Default Re: ID sender unit.

    The sender on top of the thermostat housing is the water temperature sensor that determines whether the glow plugs need to be activated for the start or not. There is supposed to be a wire connected, but that connection is so flimsy that I'm sure any wrong move in the vicinity of that sender could break the wire off. I'm sure if you look around there you'll probably find the end of the broke off wire plugged into the harness.

    With no signal from that sender, you may find that the glow plugs always come on whether the engine is warm or cold. That's what happened on my Frontier when that sender was faulty. After replacing it, the glow plugs are now activated only when the temperature of the water is under a certain limit, I think something like 5 degrees Celsius or something like that.

    The other one, I have no idea.

    Edit: Just went and checked, on mine, the wire is yellow, and I do see what looks like a broken off yellow wire just to the top right of the thermostat housing, just past the hose clamp.
    Last edited by Frontiersman; 2021/04/22 at 04:00 PM.

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  6. #4
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    Default Re: ID sender unit.

    1x glowplug sender. 1x temp sender. Bottom is glowplug , top is temp.
    Last edited by Pieterk; 2021/04/22 at 09:56 PM.
    Pieter Kemp.
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