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Top Electronic Control Module Questions

  • I put my new ECM and PROM in and the PROM blew out. Why?

    The most common cause of PROM burn-out is when the PROM is put in backwards. This will short out the PROM. It is very important that the PROM be inserted in the ECM properly to avoid this problem.
  • Before I put in a new ECM, how do I know that it will fix my problem?

    Before installing an ECM, you must test ALL related circuits on the vehicle to determine which one(s) caused the failure. Use the HOT BOX or a DVOM and measure the resistance at the harness connector. If any values are less than the specified ohms, you must find and fix the cause.

    SPECIAL NOTE: THE MOST COMMON CAUSE OF ECM FAILURE IS DUE TO ONE OR MORE OF THE ECM CONTROLLED SOLENOIDS / RELAYS SHORTED

  • I plugged in the new ECM and it didn’t fix the problem. What now?

    Prior to replacing the ECM, the installer should determine what caused the ECM to fail. Common areas that cause failures are: poor grounds and powers, bad wiring, shorted solenoids/relays, or misdiagnosis by the installer.
  • I replaced the ECM and now I have a steady check engine light and a code 51. Why?

    Make sure it is fully seated. Also check for bent or broken prongs on the PROM.
  • What is a QDR test and how can it help me?

    QDR stands for Quad Driver. Testing the QDR’s will help pin point the cause of the ECM’s failure and prevent the same thing from reoccurring again.
  • The replacement ECM for a Ford vehicle won’t start the vehicle. Why?

    The wrong ECM might have been installed. Verify the O.E. service number crosses to the correct CARDONE number.

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