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o2 Sensor Wiring To ECU

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Spanky_DSM

10+ Year Contributor
1,159
2
Sep 28, 2010
El Paso, Texas
My o2 sensor is not giving any type of feed back to the ecu as I log during Dsmlink v2.
Reads .02

I got a new sensor, and same issue.
Does anyone know how i can wire the upstream o2 sensor directly to the ECU?
The harness in this car is a mess and would be much easier to do so.

Wire color: Red ECU Pin: ???
black ???
yellow #60
white #76

Where do I route the RED and Black wires?
Thanks
 

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tap/splice the red wire to the red wire of the cam or crank sensor.

tap/splice the black wire to the black wire of either the coolant temp sensor or TPS, as these are the ones nearer to the o2 sensor connector.

tap/splice then seal properly.

hope this helps...

***edited based on Gary's 'important note' below...confirmed with other same generation [Evo5,6] circuit diagrams as well.
 
Last edited:
NO! The black on a 2g is a special Sensor Ground and must not be connected to CAS, CPS, or engine/chassis ground. Connect it to ECU pin 92 or to one of the following engine sensors black wire: manifold diff pressure, engine coolant temp, rear O2, TPS, volume air flow (MAF), and on the 98 & 99 fuel tank diff pressure. For explaination read "important note" here: http://www.dsmtuners.com/threads/oxygen-sensor-wiring.244376/.
 
I knew you'd be the one to answer my question! :) thank you!


NO! The black on a 2g is a special Sensor Ground and must not be connected to CAS, CPS, or engine/chassis ground. Connect it to ECU pin 92 or to one of the following engine sensors black wire: manifold diff pressure, engine coolant temp, rear O2, TPS, volume air flow (MAF), and on the 98 & 99 fuel tank diff pressure. For explaination read "important note" here: http://www.dsmtuners.com/threads/oxygen-sensor-wiring.244376/.
answer
 
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