Exhaust temperature sensor wiring problem

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darbuck
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Exhaust temperature sensor wiring problem

Post by darbuck »

Hi all, I just discovered I pulled the exhaust temperature sensor connector apart when I pulled the engine. There are two black wires is there any way I can check which one of these is which without removing the sensor. Any help would be much appreciated?. If there is a wiring diagram available it would help?
Darren
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darbuck
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Re: Exhaust temperature sensor wiring problem

Post by darbuck »

I am going to apply heat to the exhaust using a heat gun and measure voltage generated this should help me identify the signal wire and ground. Am I correct in this assumption.
Darren
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KennyW
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Re: Exhaust temperature sensor wiring problem

Post by KennyW »

Darren,

How much of the wiring can you see as the numbers on there will tell which is which.

I'll have quick check on sedre and see if I find your model.

Otherwise Marc will get you the wiring diagram for your car through the chassis number.

Kenny

PS Found the following numbers for 2 pin black plug for down stream exhaust sensor which goes directly to the main engine ecu 1274/1275.

But I would wait on Mark confirming this or otherwise.

Worth having a look at this link viewtopic.php?t=59872&start=15
Last edited by KennyW on 30 Apr 2023, 16:06, edited 1 time in total.
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darbuck
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Re: Exhaust temperature sensor wiring problem

Post by darbuck »

Thanks Kenny, I can't see any numbering on the wiring harness. The plug is brown but I doubt it makes a difference. It would be helpful to confirm one is signal and the other is ground.
Darren
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KennyW
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Re: Exhaust temperature sensor wiring problem

Post by KennyW »

From the wiring diagram I looked at it was input and output no earth ,so I presume it will be signal that changes with temperature.

Kenny
C5 x7 2.0 HDi 160 hp Estate exclusive, moved on.
Xantia 2.0 Hdi 90hp 1999 only 189,000 and rising!!!!!!! Moved on to a new home
C3 1.4 petrol (SWMBO)
Xantia TD 1.9 Mk 2 Estate LX 1998 model over 210,000 miles now and still rising!!!!!!!!!!!!! now deceased 17/12/2010.
ozvtr
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Re: Exhaust temperature sensor wiring problem

Post by ozvtr »

It will be a thermistor. A resistor whose resistance varies with temperature.
As the two wires are the same colour the device is not polarized and it is neither connected (directly) to a power supply nor ground. It will only be connected directly to an ECU. So it won't matter which way around the wires go.
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darbuck
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Re: Exhaust temperature sensor wiring problem

Post by darbuck »

Ok thanks lads that should make it easier just put a new connector on it so
Darren