Engine Computer Fault Codes and ecm replacement options. ECM price list
To troubleshoot the engine computer or Ecm in your car, proceed to the appropriate series of ECM tests, arranged by manufacturer. The following tests must be performed in sequence to test a defective engine computer . In addition to an obd scan tool , jumper wires are required for some tests. A remote starter switch is also helpful in performing many tests, otherwise you will need an obd scan tool. In the following procedures, all tests conducted with an obd scanner, or the voltmeter section of a voltlohmmeter (VOM), are made with the ignition switch turned to the "on" or "start" position. With the ignition switch in either of these positions, the voltage from the car battery should be present in the circuit wiring and all parts of the Ecm system. Obd tests must be made when the system circuits are "alive," or completed, and battery voltage is available at the Ecm test connections to be valid. All tests conducted with an obd scan tool, or the ohmmeter section of an obd1, are made with the ignition switch turned to the "off" position and no voltage is present in any part of the Engine computer beyond the ignition switch. Obd diagnostic tests must be made while the Ecm circuits are "dead" and no battery voltage is available at the electronic control unit.Order a new Ecm
Whether you're trying to repair a domestic or import engine computer, the basic procedures for troubleshooting an Ecm are generally similar:
3. If the electrical system passed the spark i test described earlier, then you can assume the coil, distributor pickup, and
4. To rule out the coil, you turn the engine off and check both the primary and secondary resistance of the computer. Always refer to the exact specifications listed by the manufacturer, but generally speaking, the primary resistance between the Ecm positive and negative terminals will be between 0.5 and 3 ohms. A very high reading indicates an open in the coil primary windings, so replace it if that's what you find. Secondary resistance between the coil negative terminal and high-voltage lead is usually somewhere between 8000 to 12,000 ohms. A very low reading would indicate an Ecm ground whereas a very high reading would indicate an open. If the Engine computer primary and secondary resistance readings are within the manufacturer's specs, you can rule it out as the source of trouble.
6. Now you're down to three things that could be responsible for your no-start or intermittent ecm malfunction condition: the engine computer or the wiring or a bad ecm. To check the wiring, you'll need to refer to your shop manual again to determine which connector leads do what. Basically, you rule out wiring problems by checking the wires between the ecm and pickup for continuity, then checking the engine power connector for battery voltage when the key is on. Many ecm's are also grounded through this computer connector. If your obd test shows no opens or shorts in the wiring between the module and pickup, and the module is still sending fault codes then chances are you have a bad ecm.
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