No O2 sensor voltage B1-S1 at ecu - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

jroll · 09-19-2019, 02:46 PM

I have having trouble running rich out of the exhaust, when I plug the OBDII scanner into the port it reads that its not getting no voltage at the O2 sensor (lean bias) so now my fuel trim is super high and its running rich out of the exhaust. I checked the voltage from the 02 all the way to the ecu pinout and it was good. I have no codes and the car runs great, it wont pass smog though.

jroll · 09-19-2019, 07:08 PM

Any thoughts anyone? I get .780-.820 MV from my O2 but my ECU/ECM reads 0.000

S14rebuild · 09-19-2019, 07:41 PM

Well that means u have an open wire somewhere...start checking the harness

jroll · 09-20-2019, 06:52 AM

My harness checked out, I was thinking ECU? But I don’t wanna shotgun it and waste $150

S14rebuild · 09-20-2019, 07:39 AM

Well if ur pin testing at the harness ecu connector n ur reading voltage, but ecu says its reading nothing, then that would confirm a bad ecu

jroll · 09-25-2019, 03:26 PM

I ended up buying a new (used) ecu and it worked out. Thanks

S14rebuild · 09-25-2019, 05:22 PM

Glad worked out good for u

09-19-2019, 02:46 PM	#1
jroll Join Date: Jun 2015 Location: Stockton, CA Age: 45 Posts: 11 Trader Rating: (0) Feedback Score: 0 reviews	No O2 sensor voltage B1-S1 at ecu I have having trouble running rich out of the exhaust, when I plug the OBDII scanner into the port it reads that its not getting no voltage at the O2 sensor (lean bias) so now my fuel trim is super high and its running rich out of the exhaust. I checked the voltage from the 02 all the way to the ecu pinout and it was good. I have no codes and the car runs great, it wont pass smog though.

09-19-2019, 07:08 PM	#2
jroll Join Date: Jun 2015 Location: Stockton, CA Age: 45 Posts: 11 Trader Rating: (0) Feedback Score: 0 reviews	Any thoughts anyone? I get .780-.820 MV from my O2 but my ECU/ECM reads 0.000

09-19-2019, 07:41 PM	#3
S14rebuild BANNED Join Date: May 2019 Location: Florida-FAIL Posts: 2,495 Trader Rating: (8) Feedback Score: 8 reviews	Well that means u have an open wire somewhere...start checking the harness

09-20-2019, 06:52 AM	#4
jroll Join Date: Jun 2015 Location: Stockton, CA Age: 45 Posts: 11 Trader Rating: (0) Feedback Score: 0 reviews	My harness checked out, I was thinking ECU? But I don’t wanna shotgun it and waste $150

09-20-2019, 07:39 AM	#5
S14rebuild BANNED Join Date: May 2019 Location: Florida-FAIL Posts: 2,495 Trader Rating: (8) Feedback Score: 8 reviews	Well if ur pin testing at the harness ecu connector n ur reading voltage, but ecu says its reading nothing, then that would confirm a bad ecu

09-25-2019, 03:26 PM	#6
jroll Join Date: Jun 2015 Location: Stockton, CA Age: 45 Posts: 11 Trader Rating: (0) Feedback Score: 0 reviews	I ended up buying a new (used) ecu and it worked out. Thanks

09-25-2019, 05:22 PM	#7
S14rebuild BANNED Join Date: May 2019 Location: Florida-FAIL Posts: 2,495 Trader Rating: (8) Feedback Score: 8 reviews	Glad worked out good for u