Did some internet searching: wideband sensors have 5 or more wires seemingly,the 1 im working with has 4 wires, the guys sensor has a failed heater circuit: so we fitted new,5+ days later we are experiencing runing problems,start her up,let her idle, then after about 1 minute the idle is irratic, unplug the new sensor,and it runs smooth on idle and running,so assuming the new sensor has failed, so fitting another new sensor today and see what happens.
My contact hasnt supplied me genuine pin data connection yet and there is nothing on my snap on scanner, so i amworking with a K12 disc bought off that great sale place .......
Info off disc:
oxy sens BLACK wire pin 3 goes direct to ECU pin 74 (gnd02) (assume gnd to mean ground)
oxy sens BROWN wire pin 2 goes direct to ECU pin 35 (02SFR)
oxy sens YELLOW wire pin 1 goes direct to ECU pin 24 (02HFR)
oxy sens PINK wire pin 4 fed via ign switch on and FUSE 10a (53)
1-pin 3 - 74 should have continuity
connected my short detecter (snap on) and sent a current down this line, no short problems.
2-pin 35 - 2 should have continuity
connected my short detecter (snap on) and sent a current down this line, no short problems. ( need to redo this test)
3-pin 35 - ground, should be NO continuity
pin 2 - ground, should be no continuity.
Again using my short detecter kit: no shorts to ground.
I was thinking about of possibly fitting new sensor wires direct to the ecu for testing,but with the disc NOT coming direct from NISSAN,i dont want to blow any ECU's,i would have to sit and unpick the loom in places to confirm the wire connections to ecu,by then i would have traced the wire all the way to the ecu, then could resistance check any way for faults,if the wiring is good and senser is good then possible ecu problem.
Test doing today aswell, incase i missed anything:
1-ignition on - 02 plug disconnected -terminal 4 & earth = BATTERY VOLTAGE
2-plug disconnected - resistance terminals 1 & 4 = 3.3-4.0 OHMS
3-plug connected - engine idling - terminal 2 & earth = 0 - 1 VOLT FLUCTUATING