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66chevelle903
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Mar 16, 2010, 1:11 PM
Post #1 of 24
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01 silverado,4.3liter
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code 160,started out with a 140,replaced o2 sensor and that fixed,now its 160,replaced th other o2 sensor and the light is still on,no activity,i checked the wiring but didnt see a problem,i dont have a scan tool,how can i check to see if its the computer or a open circuit,im tryn to get inspected but having no luck,please help if uv had this problem,thnx...
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steve01832
Veteran
Mar 16, 2010, 4:58 PM
Post #2 of 24
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Re: 01 silverado,4.3liter
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It is possible that you fixed it. On OBDII vehicles, the PCM has to test the circuit 3 consecutive drive cycles in order to shut the light off. Here's the catch, the PCM won't do certain tests on every drive cycle. I'd drive it for a few days to see if the light turns off. If it stays on, then you will have to go further.
Steve
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Hammer Time
Ultimate Carjunky
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Mar 16, 2010, 5:49 PM
Post #3 of 24
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Re: 01 silverado,4.3liter
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Which sensors are you changing? These are both codes for downstream sensors. Plugged cats are also possible but not likely.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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66chevelle903
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Mar 17, 2010, 11:22 PM
Post #4 of 24
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Re: 01 silverado,4.3liter
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ive changed both rear sensors,1st was code 140,now its 160,ive checked th fuse,made sure i was getn power and checked for 5 volts,i had no luck checkn for a ground,i used a seperate battery with my test light on the black wire on the plug that plugs in to the sensor,i wiggled the wires at the pcm,clear it out and abt 20 miles boom the light is back on.i been told it could be the pcm but im not sure of anything now,i heard from 1 guy and said it could be stuck between the circuits or sumthn where it goes hi to low
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Hammer Time
Ultimate Carjunky
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Mar 18, 2010, 4:32 AM
Post #5 of 24
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Re: 01 silverado,4.3liter
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The codes are saying there is no activity from the sensor so the first step would be to verify voltage coming from the sensor using a digital voltmeter with the engine running to see if that is true or not. If you find response at the sensor, then test it again where it enters the PCM.
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66chevelle903
User
Mar 18, 2010, 7:34 AM
Post #6 of 24
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Re: 01 silverado,4.3liter
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so backprobe the sensor with truck running to verify voltage,ok il try,thnx
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Hammer Time
Ultimate Carjunky
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Mar 18, 2010, 8:18 AM
Post #7 of 24
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Re: 01 silverado,4.3liter
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Your looking for a varying voltage between 0 and .999 that won't show up until the cat starts getting hot.
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66chevelle903
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Mar 18, 2010, 10:42 AM
Post #8 of 24
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Re: 01 silverado,4.3liter
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i did do that and both are getting that,im thinkn its a ground,a guy at parts hse told me to use a seperate source of power like another battery and take the test light and probe the harness going into the sensor for ground,gues he means the black wire,do i do this with the switch on or off,and do i hook the test light to the pos or neg of the battery,all in all ive got pwr to the sensor,i done wht u said and its like u said varying,i put a new sensor on both sides,so either its a ground or the pcm i guess,like i said the 140 hasnt come back just the 160,
i forgot to check at pcm for tht varying voltage
(This post was edited by 66chevelle903 on Mar 18, 2010, 11:06 AM)
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Hammer Time
Ultimate Carjunky
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Mar 18, 2010, 12:22 PM
Post #9 of 24
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Re: 01 silverado,4.3liter
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Don't going pumping power into that sensor if you don't know what your doing. The only thing that gets power there is the heater and your not getting a heater code.
If you want to test the ground, just use their ground wire as your meter ground.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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66chevelle903
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Mar 18, 2010, 2:39 PM
Post #10 of 24
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Re: 01 silverado,4.3liter
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true,well fixn 2 try out agn,i checked voltage b-twn black&red wire at connector for 12 volts&tht tuk care of the ground check,thn i done wht u said as far as warm up&tht checked out,so thn i unhooked th connectorplug&unplugged th pcm&tuk a ohm meter&checked for any differance in the tan&purple wire for a open circuit and they were th same,so i gues its in th pcm if ths drive cycle doesnt work
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Hammer Time
Ultimate Carjunky
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Mar 18, 2010, 2:47 PM
Post #11 of 24
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Re: 01 silverado,4.3liter
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The 2 black wires are for the heater. You should have 12v (key on) at one and ground at the other but since your not getting a heater code, I wouldn't be too concerned with those 2. The ground for the sensor which grounds through the sensor itself is the tan wire and the purple is the signal wire so you should be measuring between the 2.
This is only on the bank2 sensor which is the passenger side.
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66chevelle903
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Mar 18, 2010, 6:19 PM
Post #12 of 24
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Re: 01 silverado,4.3liter
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 not on this 1,a purple,tan,pink&black,welp it must b in th pcm,i drove&20 miles it came on agn,i giv up.....
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66chevelle903
User
Mar 19, 2010, 1:01 PM
Post #13 of 24
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Re: 01 silverado,4.3liter
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cause of problem is upper gasket leaking coolant....
(This post was edited by 66chevelle903 on Mar 19, 2010, 2:49 PM)
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Hammer Time
Ultimate Carjunky
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Mar 19, 2010, 3:02 PM
Post #14 of 24
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Re: 01 silverado,4.3liter
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That's not setting your 0/2 sensor code.
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66chevelle903
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Mar 19, 2010, 11:39 PM
Post #15 of 24
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Re: 01 silverado,4.3liter
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idk,thtz th word i got.....
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66chevelle903
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Mar 20, 2010, 9:34 AM
Post #16 of 24
(3422 views)
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Re: 01 silverado,4.3liter
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ur rite tht wsnt it,just anthr problem,but i was able 2 get a guy to huk up his scan tool&th bank 1 sen 2 voltage was muvng up and dwn steady,the bank 2 sensor 2 however was hardly movng,stayd arnd .045 to .048,sumthn in tht area with it running&at operating temp,shldnt th 2 bak 1"s b th same goin hi-lo,hi-lo?
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Hammer Time
Ultimate Carjunky
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Mar 20, 2010, 1:41 PM
Post #17 of 24
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Re: 01 silverado,4.3liter
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Now you need to test it right at the sensor to determine if it's the sensor or the wiring between the computer and sensor.
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66chevelle903
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Mar 20, 2010, 11:26 PM
Post #18 of 24
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Re: 01 silverado,4.3liter
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well heres wht it was,whn i bought the sensor new the guy sold it to me i nu it lukd differant,i started over chkn evrythng and it all ckd ok,thtz whn i tuk th new sensor bak out it was solid arnd it and open at the end of it,whre th other was open arnd it,thtz wht it was,so watch out for a o2sensor tht is called a alternate sensor,tht 1 was 80 bucks wth a foot to much wire,th oe type was 13 bucks cheaper,they were both made by bosch,but thnx for th help hammertime....
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Hammer Time
Ultimate Carjunky
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Mar 21, 2010, 3:10 AM
Post #19 of 24
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Re: 01 silverado,4.3liter
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Yep, sounds like it was wired differently.
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way2old
Veteran
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Mar 21, 2010, 8:52 AM
Post #20 of 24
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Re: 01 silverado,4.3liter
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The rear sensor should not be like the front. It should vary from approximately .4 volts to .6 volts on a real slow crossover.
Being way2old is why I need help from younger minds
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Hammer Time
Ultimate Carjunky
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Mar 21, 2010, 3:46 PM
Post #21 of 24
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Re: 01 silverado,4.3liter
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His PCM was getting no signal at all from the sensor on that side and it was setting a "no response" code.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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way2old
Veteran
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Mar 21, 2010, 4:28 PM
Post #22 of 24
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Re: 01 silverado,4.3liter
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ur rite tht wsnt it,just anthr problem,but i was able 2 get a guy to huk up his scan tool&th bank 1 sen 2 voltage was muvng up and dwn steady,the bank 2 sensor 2 however was hardly movng,stayd arnd .045 to .048,sumthn in tht area with it running&at operating temp,shldnt th 2 bak 1"s b th same goin hi-lo,hi-lo?
Sorry. I was referring to this post. if I am reading right he wants to know if both sensors on the same side should read the same. Will refrain from poisting on this issue. Sorry again.
Being way2old is why I need help from younger minds
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66chevelle903
User
Mar 21, 2010, 8:05 PM
Post #24 of 24
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Re: 01 silverado,4.3liter
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no,just the design of it,any oe sensorhas openings arnd it ths 1 had it at the end of it,no wonder it didnt act rite,th crazy thng thre both made by bosch....
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