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Home >> Cadillac >> 2012 >> Escalade EXT >> Repair and Diagnosis >> External Pages >> Different car >> Section 131 (Engine Controls - Self-Diagnostics) >> Diagnostic Tests >> DTC P0230: Fuel Pump Control Relay Circuit >> Diagnostic Procedures
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Diagnostic Procedures

WARNING: This page is about a different car, the 2003 Cadillac Seville and 2003 Cadillac DeVille. However, it is still accessible from the selected car via links, so may be relevant.
  1. Did you perform the Diagnostic System Check-Engine Controls? If yes, go to next step. If no, see DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS  under SELF-DIAGNOSTIC SYSTEM.
  2. Turn ignition on, with engine off. Command the fuel pump on and off with a scan tool. Does the fuel pump relay turn on and off with each command? If yes, go to next step. If no, go to step  4.
  3. Observe the Freeze Frame/Failure Records data for this DTC. Turn off the ignition for 30 seconds. Start the engine. Operate the vehicle within the Conditions For Running DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records. Does the DTC fail this ignition cycle? If yes, go to next step. If no, see INTERMITTENT CONDITIONS  under SELF-DIAGNOSTIC SYSTEM.
  4. Turn ignition off. Disconnect the fuel pump relay. Turn ignition on, with engine off. Probe the control circuit of the fuel pump relay with a test light that is connected to a good ground. Command the fuel pump on and off with a scan tool. Does the test light turn on and off with each command? If yes, go to next step. If no, go to step  6.
  5. Connect a test light between the fuel pump relay control circuit and the fuel pump relay ground circuit. Use the scan tool in order to command the fuel pump on and off. Does the test light turn on and off with each command? If yes, go to step  9. If no, go to step  11.
  6. Does the test light remain illuminated? If yes, go to step  8. If no, go to next step.
  7. Test the fuel pump relay control circuit for a short to ground or for an open. Did you find and correct the condition? If yes, go to step  14. If no, go to step  10.
  8. Test the fuel pump relay control circuit for a short to voltage. Did you find and correct the condition? If yes, go to step  14. If no, go to step  10.
  9. Test for an intermittent and/or poor connections at the fuel pump relay. Did you find and correct the condition? If yes, go to step  14. If no, go to step  12.
  10. Test for an intermittent and/or poor connections at the PCM. Did you find and correct the condition? If yes, go to step  14. If no, go to step  13.
  11. Test for an open or short to voltage in the fuel pump relay ground circuit. Did you complete the repair? If yes, go to step  14.
  12. Replace the fuel pump relay. Did you complete the replacement? If yes, go to step  14.
  13. Replace PCM. See POWERTRAIN CONTROL MODULE under COMPUTERIZED ENGINE CONTROLS in REMOVAL & INSTALLATION - DEVILLE & SEVILLE article. Did you complete the replacement? If yes, go to next step.
  14. Clear the DTCs with a scan tool. Turn off the ignition for 30 seconds. Start the engine and operate vehicle within the Conditions For Running DTC. You may also operate vehicle within the conditions that you observed from the Freeze Frame/Failure Records. Did the DTC fail this ignition cycle? If yes, go to step  2. If no, go to next step.
  15. Observe the Capture Info with a scan tool. Are there any DTCs that have not been diagnosed? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, system is okay.
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