C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Install the heated O2 ... '91 L98

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Old Apr 13, 2006 | 07:14 AM
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Default Install the heated O2 ... '91 L98

Hi,

I found an old thread but it's closed, so I can't write my question there.
I have an 3-wire heated O2 and I'm not sure which wire is the signal wire to the ECM ...

I found a schematic at sethirdgen.org, but my sensor has different colors what is shown in the second pic.






Does anybody know which wire I have to connect to the ECM?

Best wishes
Eike
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Old Apr 13, 2006 | 08:56 AM
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Is that a jeep O2 sensor
Maybe it's time to join a Jeep forum and ask them
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Old Apr 13, 2006 | 09:42 AM
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It is this one
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Old Apr 13, 2006 | 09:52 AM
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Originally Posted by Eike
It is this one
Ah, i ran the part number from your pic and it came out as an O2 sensor for jeeps.
Maybe quiz the ZR1 forum about color of signal wire.
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Old Apr 13, 2006 | 10:17 AM
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Originally Posted by AGENT 86
Is that a jeep O2 sensor
Maybe it's time to join a Jeep forum and ask them
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Old Apr 13, 2006 | 11:56 AM
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Originally Posted by Eike
Hi,

I found an old thread but it's closed, so I can't write my question there.
I have an 3-wire heated O2 and I'm not sure which wire is the signal wire to the ECM ...

I found a schematic at sethirdgen.org, but my sensor has different colors what is shown in the second pic.






Does anybody know which wire I have to connect to the ECM?

Best wishes
Eike
Hi Eike,
Do you have the stock 1 wire sensor installed? Yes? It has one violet/purple single cable. This is the ECM wire.
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Old Apr 13, 2006 | 12:08 PM
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It has one violet/purple single cable. This is the ECM wire.
Yes, I know that ... but I don't know which of the three wires (grey/black/yellow) goes to the ECM.
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Old Apr 13, 2006 | 02:06 PM
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Ohm it out to try and identify the heater. It should be a low value and polarity would not change it.
post your measurements here I'm sure the forum can solve it
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Old Apr 14, 2006 | 02:51 AM
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Originally Posted by Eike
Yes, I know that ... but I don't know which of the three wires (grey/black/yellow) goes to the ECM.
Probably I don't understand... But it seems clear that is the "C" one in the wiring diagram NON the "A" NOT the "B".
In your pic it is the gray wire.
-Beppe-
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Old Apr 14, 2006 | 08:20 AM
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Originally Posted by conv90
Probably I don't understand... But it seems clear that is the "C" one in the wiring diagram NON the "A" NOT the "B".
In your pic it is the gray wire.
-Beppe-
Good answer, i didn't even see the "ABC" on the pic of connector the first time around
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Old Apr 14, 2006 | 05:07 PM
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My measurements:

grey/black ... C/B: 146 Ohm
grey/yellow ... C/A: 152 Ohm
black/yellow ... B/A: 6,5 Ohm


So I think A/B is the heater as shown in the schematic ... thanks to you all
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