Hi guys searched but found nothing that helped!

I just got my DataScan this mornig and have been fiddling with it after work :)

Got all the values i want to be displayed up and my O2 sensor voltage just stays on 2.55v normal and wot driving :confused: do you think when i have installed my Gtir motor i have got the wiring wrong or my sensor could be broken?

Also my Timing is set at 18 when i`m driving normally it is showing 40! and drops down to 18-20 when i floor the gas!

any help would be mucho appreciated

Standard Gti-R motor/setup with Jam racing ECU running 9psi



Tony.... :biggthump

Anyone?

I switched the power wire and neutral wire and it showed 0 volts, i have unplugged it and the car feels better!

I did the torch test on it and its resistance between the red wire and white wire went from 0.74 up to 0.89 during the time i had the heat on it, i`m presuming that the reading would have risen if i had continued to heat it!



Tony....

I don't know about the O2 sensor, but the timing you are looking as it the actual timing the car is running not the base timing. The ECU advances/retards the timing depending on a number of factors. Timing of 40 degrees at partial throttle is normal, then the computer will retard the timing quite a bit at WOT which is why you are seeing the timing drop.

Thanks bud thats what i thought it was doing! just had to hear it from sumbody elses mouth. :)

This o2 sensor reading is still puzzling me ***?



Tony.... :biggthump

http://www.sr20forum.com/showthread.php?t=47864&highlight=o2+sensor+voltage

I thought your voltage looked too high and way out of the range it is suppose to be. As for why it's too high, I don't have a clue. Either the sensor or something in the wiring/ecu.

seen that post bud! thanks, but it dusnt really help me because as soon as i start the motor the o2 voltage hits 2.55v and no matter what it will stay there! :confused:

I tested it out of the car with a meter and got a reading of 0.09 ohm between the red and white wires, i also got this reading from a cut off one i had lying in the garage which i think was a good sensor :confused:

Should i be getting a reading or continuity between the red and black wires?



Tony....

2.55V is the max voltage an o2 sensor can be read out of consult with (255 being max 8-bit byte size, and raw value * 10mV = final value. 255x10mv=2.55v).

it could be ur ecu is sending that to the consult, or it could be a problem with the code that read's/displays the o2 sensor reading. are u talking about the lcd datascan or the laptop one?

The LCD one, and it displays whatever the ECU sends to it. :)

I would check wiring between ECU and o2 sensor.

Impakt

Thanks bud i will get it checked asap! i might even swap in my standard ecu incase its the JAM one!



Tony.... :biggthump

If U Ground The Black Wire On The O2 Sensor Then It Should Work..

Nissan Had The O2 Senso Ground To The Tps And When U Switch The Wires On The Tps U Lost Ground , So Ground It And Advise

Change the ecu back to stock and see how you go... I have seen S13 180sx's in the past where the o2 sensor doesnt work, and it's been because the ECU. Sometimes when S13s get chipped the o2 sensor stops working too.

I have 2 copies of s13 ECU software, some where the o2 sensor work on some cars, and others which don't.

If U Ground The Black Wire On The O2 Sensor Then It Should Work..

Nissan Had The O2 Senso Ground To The Tps And When U Switch The Wires On The Tps U Lost Ground , So Ground It And Advise
sounds good 2 me :biggthump

is that rich

yes sir!

call me u ass this is rj the atl is hot ho,s every were

call me u ass this is rj the atl is hot ho,s every were

i know who u are fool. pm me with your # btw there's only 1 DEAD SE-RIOUS :biggthump

Not to highjack, but I have the same issue.
My story: I checked the O2 sensor voltage in my B13 and it's reading 2.55 Volts all the time. I know it's running rich 'cause I can smell gas. I just swapped my stock motor for a DET and I'm using a U13 ECU with GTi-r MAF and the stock B13 O2 sensor. I tried grounding it by running a 18 gauge electrical wire from the black wire on the sensor to the block, but the voltage did not change. I even tried using the japanese (skinny) sensor and I got 0 volts. How do I reground the O2 sensor? Maybe I did something wrong.

See my previous post in this thread. For some reason, the o2 sensor works on some ECUs and not others. I dont think it's a wiring issue, because i have seen the same ECU work with the o2 sensor and then not work once it's been chipped.

Try getting a multimeter and check the o2 sensor voltage with that to see whether it's the wiring or the ECU itself.

Impakt

See my previous post in this thread. For some reason, the o2 sensor works on some ECUs and not others. I dont think it's a wiring issue, because i have seen the same ECU work with the o2 sensor and then not work once it's been chipped.

Try getting a multimeter and check the o2 sensor voltage with that to see whether it's the wiring or the ECU itself.

Impakt
Yeah, I was thinking about getting a multimeter. ***-SER-luv suggested grounding the the sensor, and I think he's on the right track, 'cause the FSM says to replace the sensor if you get an extremely low or no voltage. But it says to check for ground if you get an extremely high voltage, which is what I'm getting. What do you mean by "once the ECU has been chipped"? I'm using a stock U13 computer. Thanks!

When you chip an ecu, you don't only replace the maps, but all the software that ECU executes to run the motor.

I have various copies of S13 binaries (software + maps), and sometimes i need to keep changing the binaries until i find one where the o2 sensor returns a voltage.

After thinking about it a little more, maybe the ECU is different internally. It's possible that the o2 sensor input goes to a different part of the CPU.

Try plugging in the stock ECU and see if you get an o2 sensor reading from that.

Impakt