Throwin some Codes - Fuel Pump Secondary Circuit High?? - Ford Powerstroke Diesel Forum
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Old 09-20-2013, 06:53 AM
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Throwin some Codes - Fuel Pump Secondary Circuit High??

Hey guys, Truck is running a little rough. I am really hoping this is a quick easy and cheap fix. Edge Evo gave me the following codes.

P0232 - Fuel Pump Secondary Circuit High
P0236

Any help with this would be much appreciated.


Not to worried about these...
P0541
P0640
I know these have to do with the AIH. I did that 6637 do it yourself sorta thing and just have the sensor tied up.

Last edited by shanerbanner10; 09-20-2013 at 06:58 AM.
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Old 09-20-2013, 03:51 PM
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Anybody got anything?
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Old 09-20-2013, 05:36 PM
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codes

po236 turbo boost sensor a circuit performance
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Old 09-20-2013, 05:37 PM
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How to get rid of these?
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Old 09-20-2013, 05:49 PM
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looked it up and says map senser overboost throws this code
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Old 09-20-2013, 05:50 PM
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Overboost? Hmmm so nothing really to worry about.

I'm more worried about this fuel pump stuff. Saw something on another forum that said not to drive it around with this code.
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Old 09-20-2013, 05:54 PM
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URL of this page: P0232 Fuel Pump Secondary (Feedback) Circuit High Voltage

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OBD-II Trouble Code Technical DescriptionFuel Pump Secondary (Feedback) Circuit High Voltage

What does that mean?The fuel pump is powered by the fuel pump relay. When the PCM (powertrain control module) activates the fuel pump relay, voltage is supplied to the fuel pump and it pressurizes the fuel system. Some vehicles have a feedback on the fuel pump supply circuit. This is simply a circuit spliced into the voltage feed to the fuel pump. The splice is usually located close to the PCM.

The PCM monitors this feedback circuit to ensure that there is proper voltage being sent to the fuel pump. As it activates the fuel pump relay, it expects to see battery voltage on the feedback circuit. If the PCM sees an unexpected high voltage when the fuel pump isn't activated, P0232 may set.


SymptomsSymptoms of a P0232 DTC may include:

MIL (malfunction indicator lamp) illumination
Fuel pump runs with key off
Small amount of voltage present on FP (fuel pump) voltage supply circuit due to short
CausesPotential causes of a P0232 code include:

Bad FP relay
Short to voltage on FP voltage supply circuit or feedback circuit
Short to ground on PCM
FP relay control circuit PCM
FP relay control driver shorted to ground internally
Possible SolutionsIt is possible with a P0232 for the fuel pump to be running continuously, even with the ignition off. If that's the case and you can hear the fuel pump running, you may be able to disregard some of the following checks. Turn the KOEO (key on engine off) and wait for a few seconds. This allows the PCM to complete it's fuel pump pre-cycle. Now, using your scan tool (if you have one) observe the FP VOLTAGE FEEDBACK reading in the datastream. This reading indicates what kind of voltage the fuel pump is receiving.

If you don't have access to a scan tool, use a voltmeter to read the FP voltage at the fuel tank. If your reading shows any voltage at all present to the fuel pump with KOEO (or if you can hear the pump running), remove the FP relay. If the voltage remains, or the fuel pump continues to run, then there is a short to voltage on the FP voltage supply circuit or on the feedback circuit. Repair as necessary. If the voltage disappears (or the pump quits running) with the FP relay removed then try replacing the relay with a spare one. Upon reinstalling the spare relay, if the voltage disappears, the relay was faulty due to a short. If, though, after replacing the relay voltage is still present, suspect that the PCM FP relay control circuit is shorted to ground.

Check for a short to ground on the PCM FP relay control (ground driver) circuit by removing the FP relay and ohm between a good ground and the PCM FP relay control. There should be no continuity to ground with KOEO (after the FP pre-cycle is completed). If there is continuity to ground the wire is shorted. Find the short to ground and repair as necessary. If you can find no physical short, It may be necessary to snip the FP relay control wire close to the PCM connector where it will be easy to repair and check for continuity to ground with KOEO coming OUT of the PCM. If there is no continuity the wire is shorted in the harness. But if continuity exists, the driver may be internally shorted to ground and the PCM may require replacement.

Article written by Dale Toalston


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Old 09-20-2013, 06:01 PM
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Thanks for the help.
Do you think I'd be ok driving with this code for the next week or so?
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Old 09-20-2013, 06:07 PM
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should of bought a 7.3
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Old 09-20-2013, 06:08 PM
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It is a 7.3 hence why this is posted in the 99-03 7.3L section of the forum.
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