TPS losing 5v reference.

[Caribe]

We have a 2000 Pontiac Montana that has an intermittent TPS. We changed out the TPS but we are still having problems. It looks like the TPS is losing it's 5 volt reference once in a while and reading 0 on the scanner. Press the pedal down and it would still read 0. When I read the codes it had p0122 TPS/Pedal position sensor A circuit low input( which was expected) and a p0452 Evaporative Emission Control System Pressure Sensor Low Input indicates a low voltage problem in the Fuel Tank Pressure Sensor (FTPS). I understand that also uses a 5 volt reference. Anyone know if changing the FTPS would be the next step. Is it located on top of the fuel tank over the fuel pump. Thanks

[spike88]

Originally Posted by Caribe

We have a 2000 Pontiac Montana that has an intermittent TPS. We changed out the TPS but we are still having problems. It looks like the TPS is losing it's 5 volt reference once in a while and reading 0 on the scanner. Press the pedal down and it would still read 0. When I read the codes it had p0122 TPS/Pedal position sensor A circuit low input( which was expected) and a p0452 Evaporative Emission Control System Pressure Sensor Low Input indicates a low voltage problem in the Fuel Tank Pressure Sensor (FTPS). I understand that also uses a 5 volt reference. Anyone know if changing the FTPS would be the next step. Is it located on top of the fuel tank over the fuel pump. Thanks

For your TPS (throttle position sensor) trouble-shooting, here's some URLs that might help:

If replacing TPS: https://www.dsmparts.com/customer/pr...=27&page=&js=y
Troubleshooting: http://www.j-body.org/forums/read.ph...=49581&t=49581

Simular problem & solution on different GM vehicle:
- http://www.automotiveforums.com/t940..._from_pcm.html

Hope this info helps - somehow...

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