OBD2 o2 sensor wiring


S34six

S34six

New Member
Joined
Oct 20, 2010
Messages
34
hey guys im trying to fing out which wires from my o2 sensor actually goes back to my ecu, my o2 sensor wires are white, green and 2 black wires, any info would be helpful because im getting a heater circuit code and i want to trace it to see whats the problem, i have a 99 EK9 honda civic.
 
mine has an obd2a setup, plus i want to know if all four wires go back to the ecu or if only two goes back to the ecu.

thank you
 
i still havent gotten my heater circuit fixed, does anyone have the slightest idea on what to do.

i checked the primary heater control pin, which is A6 and on my ecu and im not getting any voltage, i placed my ecu in another car, tested it and got voltage from my ecu in another car, but when its in my car it isnt working.
 
Sice you got a heater code, did you check the heater resistance?
 
S34six said:
yes its at 18
Click to expand...

Right, did you check the ground and power at the sensor block connector? what about continuity through sensor block connector to ecu block connector. If you have done a engine conversion you may have broken the wire on the loom..
 
i finally got it sorted apparently i was looking for voltage on the A6 pin but it was sending out a ground so i gave the heater its own voltage from the ignition and now its working fine, but now im getting the knock sensor code so i have to do some checks.

thanks for the help BTW
 
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