throttle position sensor - Nissan Forum
QG18 1.8L Engine Engine Discussion: 2000+ Sentra XE, GXE, & 1.8

 
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#1 Old Feb 18th, 2013, 07:35 AM
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throttle position sensor

Just want to know is the throttle position sensor something that can be swaped out with a new one or is there something u have to calibrate or anything?
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#2 Old Feb 18th, 2013, 03:14 PM
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It'll have to be adjusted and the closed throttle position will need to be relearned.
#3 Old Feb 19th, 2013, 06:22 AM
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Re: throttle position sensor

Is this something I can do or does it need to done at a shop, because I usually do my own work and if I can save some dollars would be helpful
Thanks.

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#4 Old Mar 1st, 2013, 06:08 PM
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I can't tell you what you can or cannot do; you have to determine that. Checking the TPS will require a vacuum pump and a capable scantool to measure the TPS voltage, or you will have to use a voltmeter and backprobe pin 92 of the ECM. You would need a scantool to monitor the closed throttle position switch. I would suggest you get a factory service manual for your Sentra. You can download one here:

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#5 Old Mar 4th, 2013, 11:29 AM
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quick question, is your riveted on?
#6 Old Mar 5th, 2013, 09:47 AM
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Re: throttle position sensor

Sorry to seem blonde but don't know what that is, the reason why I'm asking all this is because I have a code p0171. And it's causing my car to idle rough, and hesitate, and sometimes Shut off at a stop light, I'm pretty good at fixing cars on my own even though I've just been on here and and Google, and this is the only thing left that's giving me problems, and I have a pretty decent scan tool and it show live data and all just don't know how to read it all, and much thanks for that manual sir. So any help is appreciated.

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#7 Old Mar 5th, 2013, 11:14 AM
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P0171 code is a system lean code, not a throttle position sensor code. Most of your P0171 codes are set due to a dirty or faulty mass air sensor, a faulty air/fuel or oxygen sensor, or unmetered air entering the engine. Exhaust leaks near an air/fuel or oxygen sensor can also do this, but are rare.
#8 Old Mar 5th, 2013, 03:02 PM
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Re: throttle position sensor

OK I'm looking at my scanner now and it's saying fuelsys1 fuelsys2 CL on them both or OL when I step on the gas, until it shutters and it changes from CL to OL-fault.

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#9 Old Mar 5th, 2013, 03:57 PM
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Re: throttle position sensor

Also shrtft1 and shrtft2 drops down to 0.0 when shuttering, am reading this on a obd2 scan tool.

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#10 Old Mar 21st, 2013, 09:33 PM
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That's pretty strange. A car should only be in open loop until the exhaust / O2 Sensor reaches 600 degress and the PCM is ready, then goes into closed loop. Seems like your O2 sensor is going bad but there are ways to single out the problem. A dirty MAF can cause that problem too. Try getting a MAF cleaner that won't harm electrical components and see if the problem goes away. If there's a large vacuum leak, that could be a problem too. If you have a bottle of propane and a nozzle, hook up your scan tool and watch the trims while tracing the vacuum lines with propane but don't blast propane everywhere. If there is a leak, the trims will change from the gas being sucked in when you apply propane to the area. As for the O2 sensor, there actually is a way to "clean" that sensor. I know this sounds weird, but if you have a blow torch and something to clamp your O2 sensor with, torch the sensor until it's cherry red. The fire will "clean" the debris/carbon on the O2 sensor. Just don't burn the wires connecting the sensor. If you have a DVOM, probe the pins while you torch the sensor, constantly bringing in and out of heat. The numbers should raise and lower as you sweep the torch. Once your DVOM shows 0-900 mV, the O2 sensor is as good as new. If it doesn't, time to replace. Remember, O2 sensors use DC (Direct Current) Don't know if this'll help but it's worth a shot. If you happen to have a fuel presser tester, that would help out too. Test the rails for proper fuel pressure. And check the injectors. If you have a long screwdriver, place the tip of the screwdriver on an injector and the handle to your ear then listen to the clicks (acts as a stethoscope). If one sounds off, that injector may be dying. Should have sharp rhythmic clicks

Last edited by SpunkyB15; Mar 21st, 2013 at 10:05 PM.
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