no Power From O2 - (2 brown wires??) - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

MrFairlady · 06-28-2009, 02:27 PM

Consult Shows NO o2 Readings.
(Sr20 bltp in a 93 hatch - w/ Brand New SR20 Harness).New Bosch 3 wire O2 sensor.

On the S13 Chassis side (2 main plugs near Battery) there seems to be a Brown wire on the small Brown plug un-used,..but the Brown o2 Sensor wire coming off the SR harness can supposedly be wired to any +12v Switched source.I wired (soldered) it to the Blk/Red stripe like the Diagram States you can.

COnsult Shows no reading from o2.Checked the o2 wiring itself and its correct.Why would there be no Power to it?

What is the Brown wire on the Chassis/engine harness then?

MrFairlady · 06-29-2009, 09:04 PM

Tested Brown Wire (to sensor and to Wiring on Chassis harness) and theres 14v going to it and No Codes for Sensor on Consult.Just no readings.Everything else is Getting SOMETHING by what the Consult is saying.Drove it a couple Nights ago and Still no readings.

It even Got hot just turning the key to on w/ the sensor out trying to test to see if the sensor was getting power.
The Pin to the Sensor was Good.Will test that the CU is seeing power but theres only a o2 Sensor Input Wire?S14 SR20FSM says to test the 02 Sensor Output.There is not such a Wire on the S13 Blktop/Redtop.

Is it True that the sensor will see no readings at idle???Only under load??

06-28-2009, 02:27 PM	#1
MrFairlady Nissanaholic! Join Date: Mar 2007 Location: Fascination Street,N.C Age: 45 Posts: 1,701 Trader Rating: (31) Rides Gallery: MrFairlady Feedback Score: 31 reviews	no Power From O2 - (2 brown wires??) Consult Shows NO o2 Readings. (Sr20 bltp in a 93 hatch - w/ Brand New SR20 Harness).New Bosch 3 wire O2 sensor. On the S13 Chassis side (2 main plugs near Battery) there seems to be a Brown wire on the small Brown plug un-used,..but the Brown o2 Sensor wire coming off the SR harness can supposedly be wired to any +12v Switched source.I wired (soldered) it to the Blk/Red stripe like the Diagram States you can. COnsult Shows no reading from o2.Checked the o2 wiring itself and its correct.Why would there be no Power to it? What is the Brown wire on the Chassis/engine harness then? __________________ z-tERty-2

06-29-2009, 09:04 PM	#2
MrFairlady Nissanaholic! Join Date: Mar 2007 Location: Fascination Street,N.C Age: 45 Posts: 1,701 Trader Rating: (31) Rides Gallery: MrFairlady Feedback Score: 31 reviews	Tested Brown Wire (to sensor and to Wiring on Chassis harness) and theres 14v going to it and No Codes for Sensor on Consult.Just no readings.Everything else is Getting SOMETHING by what the Consult is saying.Drove it a couple Nights ago and Still no readings. It even Got hot just turning the key to on w/ the sensor out trying to test to see if the sensor was getting power. The Pin to the Sensor was Good.Will test that the CU is seeing power but theres only a o2 Sensor Input Wire?S14 SR20FSM says to test the 02 Sensor Output.There is not such a Wire on the S13 Blktop/Redtop. Is it True that the sensor will see no readings at idle???Only under load?? __________________ z-tERty-2