What causes an OBD code for a GMC fuel pump?
Causes. Possible causes of OBD code P0230 GM. Potential causes of a P0230 GM code include: Short to ground on control circuit Fuel pump control circuit open Short to battery voltage on control circuit Harness chafing causing one of above conditions Bad relay Bad PCM.
How to check for fuel leaks in a GM 4.3L?
Once the fuel pressure gauge registers pressure, check for fuel leaks around the Schrader valve. It’s very important that NO fuel leaks are present for the accuracy of the test. Once you have verified no fuel leaks, continue to the next step. Have your assistant crank the engine as you eyeball the fuel pressure gauge.
How to diagnose a faulty fuel system control module?
AT THE BOTTOM OF THIS PAGE, YOU WILL FIND THE YOUTUBE VIDEO FOR THIS PROCEDURE. YOU WILL ALSO FIND THE PIN OUT DIAGRAM FOR THE FUEL SYSTEM CONTROL MODULE FOUND ON 2007 AND NEWER GM VEHICLES. PLEASE REFERENCE THE DIAGRAM TO HELP PROPERLY DIAGNOSE A FAULTY FUEL SYSTEM CONTROL MODULE. 1. CONNECT PIN1 (BLACK GROUND) TO PIN16 (PINK GROUND) 2.
How does fuel pump work in GMC p0230?
Whenever the key is turned on, the PCM grounds the fuel pump circuit for a few seconds, activating the fuel pump and pressurizing the system. The fuel pump won’t be activated again until the PCM sees an RPM signal. The driver in the PCM is monitored for faults.
How to check no fuel condition on GM 4.3L?
I’ve also included how to check a no fuel condition with starting fluid (although this is not the most effective way to test the fuel pump). It’s been my experience that misdiagnosing a bad fuel pump is a common occurrence on the 4.3L, 5.0L, 5.7L GM vehicles with the ‘Spider’ fuel injector assembly.
What to do if your fuel pump wont start?
For future reference, I had this same problem when replacing the fuel pump on my 2002 s10 4.3L. Searched forever for an answer. It turns out that in order to remove the bed of the truck, you must disconnect the ground for the fuel pump, which attaches in the rear on the drivers side.
What should fuel pressure be on GM 4.3L Vortec?
You can find this tutorial in Spanish here: Cómo Probar La Bomba de Combustible (GM 4.3L, 5.0L, 5.7L) (at: autotecnico-online.com ). The fuel system in your 4.3L, 5.0L, or 5.7L Vortec engine needs at least 50 PSI of fuel pressure to start.
How can I tell if my fuel pump is leaking?
Once the fuel pressure gauge registers pressure, check for fuel leaks around the Schrader valve. It’s very important that NO fuel leaks are present for the accuracy of the test. Once you have verified no fuel leaks, continue to the next step.