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Hi everyone!
My name’s Serg, this is my first question on the forum, hope to get some help and advise:
I have an 02 Altima with SEL on and the codes p0031 and p0035 related to O2 sensors circuit!– Faulty Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1
– Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1 harness is open shorted to ground
– Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1 circuit poor electrical connection
– Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1 circuit fuse
– Faulty Engine Control Module (ECM)here’s what I did, checked the O2 sensor heater for connectivity with a multi meter and it’s good, o Ohms, Checked the fuses- they are good!
I am not getting 12 V to the sensor with the ignition key on!
What should I do next to detect if it is either a harness or the ECU, can you show me a little video on what should my next step be?
thanks!
You are much appreciated!
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[quote=”Emily160612″ post=161684]Hi everyone!
My name’s Serg, this is my first question on the forum, hope to get some help and advise:
I have an 02 Altima with SEL on and the codes p0031 and p0035 related to O2 sensors circuit!– Faulty Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1
– Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1 harness is open shorted to ground
– Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1 circuit poor electrical connection
– Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1 circuit fuse
– Faulty Engine Control Module (ECM)here’s what I did, checked the O2 sensor heater for connectivity with a multi meter and it’s good, o Ohms, Checked the fuses- they are good!
I am not getting 12 V to the sensor with the ignition key on!
What should I do next to detect if it is either a harness or the ECU, can you show me a little video on what should my next step be?
thanks!
You are much appreciated![/quote]Check your fuses for the o2 heater circuits.
Luckily for you, your PCM has no control over the heater circuits for the O2. The fuse block directly feeds power to the heaters with the key on and the heaters are chassis grounded through the harness. At this point, just make sure you’re testing the right wires. Both the upstream and downstream heaters are powered by RED/YELLOW wires. Test both wires at their sensors for battery voltage. Try testing those wires with the O2’s connected and disconnected with the key on. This is to find out if one or both of those wires is bad. What we’re really trying to figure out is if there’s a problem before or after a splice in that power circuit. There’s a splice showing in the wiring diagram, but this could be tricky to diagnose from my chair since the splice could very well be in the fuse block itself.
If you’re comfortable with wiring diagrams, I can provide them. But, I’d still need to know which engine you’ve got so I can get you the right diagrams.
Otherwise, run with what I gave you so far and keep us posted.
Good Luck.
You can find the diagnostic procedure starting on page 147 of http://www.nicoclub.com/FSM/Altima/2002/ec.pdf.
Are you sure about the second code? A P0035 is a Turbocharger/Supercharger Bypass Valve Control Circuit High. Are you sure it is not a P0032 or a P0335?
splice? interesting, I’d love to look at a diagram, after replacing the cat and o2 sensors I tried starting the car and I did hear a spark like noise, similar to when a fuse blows, I checked all the fuses and they are ok so the short might have happen somewhere at the splice! Anyways if you have a diagram I’d be so thankful, I couldn’t find one! Thank you
See if this helps with the P0037.
http://www.autocodes.com/p0037_nissan.html
also, page 131 of the link I gave above will deal with the P0037.
Since you have heater codes for both O2s, I would check at the fuses for 12v., after following the diagnostic procedure in the FSM, since I’m not sure if the ECM is monitoring with KOEO. I would think with the engine running, you should see 12V at the fuses. If not, you may need to chase the harness back toward the battery and if that checks out then work towards the ECU.
Good luck and keep us up to date.
[quote=”Emily160612″ post=161850]splice? interesting, I’d love to look at a diagram, after replacing the cat and o2 sensors I tried starting the car and I did hear a spark like noise, similar to when a fuse blows, I checked all the fuses and they are ok so the short might have happen somewhere at the splice! Anyways if you have a diagram I’d be so thankful, I couldn’t find one! Thank you[/quote]
Two things: It may not be a short so much as it could just be a broken/corroded wire after said splice. If it was a short, you would have a blown fuse. The next thing is I still need to know if it’s a four cylinder or a six cylinder.
see if this helps. Starts at 784.
OMG! Thank you everyone for your help! It is so embarassing but the whole problem seemed to be a fuse, a missing fuse! I was looking for a blown fuse but I was actually missing the O2 sensor fuse, don’t know how that happened but finally found a fuse diagram and figured that I am 1 fuse short and finally got it! Thank everyone!
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