help no o2 sensor readings?

[73 Nova Guy]

ok i have a 5.3 turbo'd we are trying to get the car to run in closed loop and having no luck with the o2 sensors working. i have them wired correctly on power one ground for the heater and a high and low side. i have checked the continuity of the wires for the high and low side and every thing checks out. i even replaced the o2 sensor no luck


this is a 411 pcm with a custom os. possibly i am logging the wrong pid's?
i have the factory narrow band hooked into rear bank2 sensor 2 and the lc1 narrow band side hooked in to bank1 sensor 1. i was moving them around the pins just to check other places to get readings.

here is a log file..
Log_0014.efi

any idea's on what i am doing wrong here would help.

[limited cv8r]

You could try logging SAE.FUELSYS in the fuel tab of pid's to see if you are actually going into closed loop. Also post up your tune and people may be able to help.

[73 Nova Guy]

here is the current tune..
9-24-10_0003.tun

i will log that pid tomorrow and post it up can run the car any more today.

[bai78]

It could be that the HO2S low signal wires are not fully pinned into the pcm.

I had similiar problem with my Bank 2 Sensor 1 and it turned out to be the low signal pin was not making full contact with the pcm. A little adjustment and viola, all was operational and into closed loop!

[73 Nova Guy]

i wish i have had the pins in and out ten times and have checked this not the problem..

[bai78]

Well it was worth a shot. Have you looked at the pcm pin itself? On odd occasions they will recess & you have to pull them out with some needle nose pliars. I'm just throwing it out there as it happened to me & was tripping a code for EBCM communication.

[73 Nova Guy]

i took a quick look at them. i don't get any signal from any of the 4 sensors.

today i found that the car doesn't go into open look like expected.. not sure why that is..

[WeathermanShawn]

today i found that the car doesn't go into open look like expected.. not sure why that is..

Your B4205 Temps are still at 34C. That keeps you in closed-loop.

[73 Nova Guy]

Your B4205 Temps are still at 34C. That keeps you in closed-loop.

i am sorry i meant to say closed loop.. im trying to get the car into closed loop..

[joecar]

It won't go into CL until you can get a correct NBO2 signal from the front NBO2 sensors...

From log in post #1:
HO2S11 (front left): voltage is pegged high at 1000mV (with a some interesting ripple in it), may be a possible short to power.
HO2S21 (front right): voltage is flatlined at 450 mV (the at-rest voltage), this is an open circuit.
HO2S12 (rear left): 450mV, open circuit.
HO2S22 (rear right): 920mV with ripple coinciding with MAP sensor... possible short circuit.