Does anyone know what can cause a pc 0231 code to show? I know it means fuel pump feedback circut low, but how can you fix it? Is it just the fuel pump going bad or maybe more serious. Also how do I clear the codes after I fix it? Thanks for any help

I guess I'll carry on with the infos I gave you the other day. :P

How to clear codes (any code):

SELECTING THE SYSTEM

After trouble codes have been displayed, a specific vehicle system PCM, IPC, ACP, SIR, TCS, RSS may be selected for testing.

The first available system will be automatically displayed (i.e. PCM?). While selecting the system to test, any of the following actions may be taken:

Depressing the "HI" button on the CCC will select the displayed system for testing.
Depressing the "LO" button on the CCC will display the next available system selection. This allows the display to be stepped through all system choices. This list of systems can be repeated following the end of the system list.
Depressing the "OFF" button the CCC will stop the system selection process and return the display to the beginning of the trouble code sequence.
Pressing the "OFF" button twice will return the system to the segment check.

SELECTING THE TEST TYPE

Having selected a system, the first available test type will be displayed (i.e. PCM DATA?, PCM CLEAR CODES?). While selecting a specific test type, any of the following actions may be taken:

Depressing the "HI" button on the CCC will select the displayed test type. At this point the first of several specific tests will appear.
Depressing the "LO" button on the CCC will display the next available test type for the selected system. This allows the display to be stepped through all available test type choices. This list of test types can be repeated following the display of the last test type.
Depressing the "OFF" button on the CCC will stop the test type selection process and return the display to the next available system selection.

CLEAR CODES

Selection of "CLEAR CODES?" test will result in the message "CODES CLEARED" being displayed along with the selected systems name. This message will appear for 3 seconds and then return to the next available test type.


Code PC0231:
The fuel pump receives power from CKT 120 through the fuel pump relay. The PCM energizes the fuel pump relay for 2 seconds at key ON to provide fuel pressure for starting. After the 2 second fuel pump prime, the PCM will not power the fuel pump relay until 4X reference pulses are received indicating that the engine is turning (crank or run). The PCM monitors voltage on the fuel pump power CKT 120 to detect fuel pump voltage supply faults. DTC P0231 is set when the PCM sees the fuel pump not energized (2 volts or less on the feedback) with the engine cranking or running.

I have some more stuff about it but that may be a little much for this thread for now.

Let me know if this helps.

By the way, I get this from alldatadiy (or the service manual). You really need to pay for that if you want to fix things.

Thanks for all the help, I orderd a manual but right now im lost till it gets here. This forum is great I cant believe It took me so long to find it.

The first thing to check for that code is the fuel pump relay in the relay center. The code is looking at the fuel pump circuit when the PCM turns on the fuel pump relay and is not seeing voltage on the fuel pump line for some reason.

Are you experiencing long cranks to start the engine especially when cold??

Hello, no im not having to crank long, but I do hear a whining that sounds like it may be coming from the fuel pump? Im not sure though. So do you suggest changing the fuel pump relay? Thanks