Main IndexAuto Repair Home Search Posts SEARCH
POSTS
Who's Online WHO'S
ONLINE
Log in LOG
IN









code po463


  Email This Post



paulrice
User

Jan 14, 2010, 5:57 PM

Post #1 of 4 (8586 views)
Shortcut
code po463 Sign In

2000 chevy 1500 pick up 4.8 108000 miles fuel level circuit sensor high voltage whats that mean


Sidom
Veteran / Moderator
Sidom profile image

Jan 14, 2010, 6:04 PM

Post #2 of 4 (8576 views)
Shortcut
Re: code po463 [In reply to] Sign In

It means there is a problem in the fuel sending unit circuit. The PCM uses a 5v reference on this system to calculate fuel level. There is either a problem in the sending unit or related wires causing the voltage to be too high for too long.

I'm assuming the fuel gauge isn't working.........






__________________________________________________________________________________________



paulrice
User

Jan 14, 2010, 6:23 PM

Post #3 of 4 (8570 views)
Shortcut
Re: code po463 [In reply to] Sign In

the gauge is not working right would that send a p300 code also?


Sidom
Veteran / Moderator
Sidom profile image

Jan 14, 2010, 6:33 PM

Post #4 of 4 (8569 views)
Shortcut
Re: code po463 [In reply to] Sign In

No, a P0300 is a random misfire.

I would take a fuel pressure reading and see how long the pressure holds with the key off. You should have around 60 psi KOEO and the pressure shouldn't drop too much too fast.

If the pressure is weak & drops too fast, I would start with changing out the fuel pump & connecter. These come as an assembly, pump, sending unit & FTP sensor. While it was out I would verify the 5v ref & grounds. If I remember correctly the fuel gauge ref wire is the small purple wire. The ground wires are black.

It's quite possible this may take care of both problems.



Just a quick caution to never use a test light on a computer ref voltage line. It's very possible to damage the PCM that way. High impedance voltmeter or lab scope only.






__________________________________________________________________________________________





code po463


  Email This Post
 
 






Latest Forum Post

I have a 92 Honda Accord that has a loud buzzing noise coming out from under the...


Car was working fine, and then wouldn't start one night. Mobile mechanic change...


Greetings from cooking hot and humid SW Florida. Been getting lot's of help her...


I have just bought a 1961 Chyrsler Windsor Sedan.To cleanup then resale (I Hope)...


Hi Guys, Girlfriend and I went on vacation in her 2005 escape. We get to a moder...


1976 Jeep CJ7 with AMC 305 V8, auto transmission. Vehicle rolls when in Park. Wh...


Feed Button






Automotive Forum Categories
AC Auto Repair
Auto Body Repair
Auto Insurance
Automotive Repair
Automotive Wiring
Automotive World
Brake Systems
Car Care Tips
Car Racing
Car Shows and Events
Car Stereo Repair
Car Troubleshooting
Engine and Car Noises
Engine Fault Codes
Engine Troubleshooting
Exhaust System Repair
Gasoline and Motor Oils
General Discussions
Motor Vehicle Inspection
Motorcycle ATV Repairs
Motorcycle Body Repair
Motorcycle Clutch Repair
Motorcycle Engine Repair
Motorcycle Repair
Motorcycle Seat Repair
Remote Control Cars
Steering and Suspension
The Bargin Bin
Traffic Ticket Help
Tricks of the Trade
Truck Repair
Truck Repair Advice
Truck Engine Repair
Truck Suspension Repair
Car Forum - Sitemap


Search for (options) Privacy

web statistics