Question;
With ignition on (engine not powered up), what's the readings I should get at the o2 connectors (wiring harness end, NOT the o2 sensor wires itself.)?
As you may be aware, I have the rough idle / intermittent stalling issue which now seems to have got a little worse, engine dies almost all the time unless I hit the accelerator. No air leaks (double checked), clean connector at evap solenoid, seemingly OK IAC valve, new plugs, new wires etc. Suspicion now lies on either O2 Sensor itself, wiring / relay to o2 heat element, AFM or probably a totally bad evap canister.
The problem is only at idle. Starts up perfectly (no drag / lag), accelerates perfectly (no hesitation like it starves for fuel), drives fine etc. But, when I approach traffic by pressing clutch and releasing accelerator (engine goes to idle), the engine stalls out almost always now. Previously, it was intermittent.
After erasing codes, and running around, I now get 1223 error.
Previously, I've got errors 1244, 1221 also.
But upon resetting, it goes away and never returns. 1223 is the only code that returns.
Anything else that I need to suspect?
I checked 7.5A fuse, it's visibly OK and not burnt out.
How do I check if the relay (on which the 7.5A fuse is connected to) for the o2 heat element is bad?
My TS has two 2-pin connectors for the o2 sensor.
I used a multimeter to check voltage on o2 connector wires (wiring harness end, not the o2 wires)
With ignition on and engine not cranked, I get 0v, 0v, 0.14v, 0.13v in each of the 4 wires I tested.
Should I not be getting 12v in at least one wire??
If so, what should I do next? Probably a bad wiring or relay?
Thank you.
Zaid