Primary o2 Pin D14 3.83v
Posted: Sun Jun 11, 2017 11:13 pm
I've got a peculiar issue and just looking for suggestions on where to look next. I've had my wideband wired to pin D14 for probably a couple thousand hours of driving my turbo civic. I think when I first got my hondata the Primary o2 sensor was wired into d14, then I had some exhaust work done (for the turbo), didn't have another welded bung so I scrapped the o2 and just left the wideband in the pipe. now the car wouldn't run unless something was providing voltage on the D14 pin so I just used that for the wideband as it would not run with the wideband on d10 (eld) and nothing on d14. I've now today after welding another o2 bung on the exhaust, tried running the car with Pri o2 and the wideband in the respective pin locations with no luck. in hondata the ecu reads 3.83 volts on the o2 sensor(leads me to believe it's reading nothing), eld reads 2.4 - 2.7 (normal) and when measuring at pin D14 with a voltmeter I'm getting 0.5v with ignition on for the primary o2 sensor. My question is have I fried the o2 circuitry by exceeding 1.1volts on d14. why will hondata not run the car even in open loop? or in closed loop wideband target voltage using d10(eld)? I had the car running with only the wideband on d14, did the rewire for both o2 primary and wideband, and now it just cranks and nothing else. I'm running the most recent usb driver, most recent smanager downloaded today. I'm trying to currently reverse engineer the ecu to measure where this o2 signal is traveling and test the respective components. Thanks for any help.