I have an inexpensive OBD2 and using Torque app. It can't display the ftp sensor reading. It would be great to have your crp123 unit. Looks like I will have to backprobe the sensor with a voltage meter. It would have been nice if you had a working sensor so we would know what a good pressure reading is when it reads vacuum and when it reads atmosphere (fuel cap removed).
I understood him perfectly he is testing if the wiring and pcm was working and then tested the pressure sensor. Problem solved : bad pressure sensor and he is replacing it. However on this truck they have cut a hatch in the bed making it easy excesable. I cut a hatch in my 98 chevy truck years ago when I put a new fuel pump because these sensors and pumps seem to be a common issue. My tool box sits on top of the hatch anyway. The p0446 code came on so I am just going to change this sensor I don't have a scan tool but I also opened the fuel cap and no suction so it's got to be the sensor because I already changed the fuel cap recently. Hope this helps.
I have to agree with Rick on this one. This dude doesn’t explain anything. First of all how does he even know that the sensor is bad? 1.5v is a valid value if we have current atmospheric pressure (I.e gas cap off) and a low reading close to 0 indicate high pressure. He then tested the integrities of the wire and swap part. How did he even know that the part is bad without checking if the signal voltage fluctuate at different conditions? In addition he’s doing some really dangerous stuff, such as connecting 5v reference to ground. The high current could zap your PCM and you will be in deep shit. Safest way to test with a volt meter would be just 1)test the reference line to see if it’s 5V (meter red to ref, black to known good ground but not harness ground) 2)resistant continuity from battery negative to ground wire to verify ground line.
![Pressure Sensor or Potentiometer Signal Fixed at 0v [Circuit Integrity Testing]](http://i.ytimg.com/vi/CkgrMasd57s/mqdefault.jpg)
I have an inexpensive OBD2 and using Torque app. It can't display the ftp sensor reading. It would be great to have your crp123 unit. Looks like I will have to backprobe the sensor with a voltage meter. It would have been nice if you had a working sensor so we would know what a good pressure reading is when it reads vacuum and when it reads atmosphere (fuel cap removed).
What scan tool are you using their. And how do you like it?
All the tilting is not necessary.
all Chinese, Doesn't say what setting on multimeter, and a lot more.
I can’t follow anything this guy’s saying, he doesn’t explain why he’s doing what he’s doing
I understood him perfectly he is testing if the wiring and pcm was working and then tested the pressure sensor. Problem solved : bad pressure sensor and he is replacing it. However on this truck they have cut a hatch in the bed making it easy excesable. I cut a hatch in my 98 chevy truck years ago when I put a new fuel pump because these sensors and pumps seem to be a common issue. My tool box sits on top of the hatch anyway. The p0446 code came on so I am just going to change this sensor I don't have a scan tool but I also opened the fuel cap and no suction so it's got to be the sensor because I already changed the fuel cap recently. Hope this helps.
I have to agree with Rick on this one. This dude doesn’t explain anything. First of all how does he even know that the sensor is bad? 1.5v is a valid value if we have current atmospheric pressure (I.e gas cap off) and a low reading close to 0 indicate high pressure. He then tested the integrities of the wire and swap part. How did he even know that the part is bad without checking if the signal voltage fluctuate at different conditions? In addition he’s doing some really dangerous stuff, such as connecting 5v reference to ground. The high current could zap your PCM and you will be in deep shit.
Safest way to test with a volt meter would be just
1)test the reference line to see if it’s 5V (meter red to ref, black to known good ground but not harness ground)
2)resistant continuity from battery negative to ground wire to verify ground line.