Engine Control Module: Service and Repair

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Engine Control Module Replacement

Caution:
* Turn the ignition OFF when installing or removing the control module connectors and disconnecting or reconnecting the power to the control module (battery cable, powertrain control module (PCM)/engine control module (ECM)/transaxle control module (TCM) pigtail, control module fuse, jumper cables, etc.) in order to prevent internal control module damage.
* Control module damage may result when the metal case contacts battery voltage. DO NOT contact the control module metal case with battery voltage when servicing a control module, using battery booster cables, or when charging the vehicle battery.
* In order to prevent any possible electrostatic discharge damage to the control module, do no touch the connector pins or the soldered components on the circuit board.
* Remove any debris from around the control module connector surfaces before servicing the control module. Inspect the control module connector gaskets when diagnosing or replacing the control module. Ensure that the gaskets are installed correctly. The gaskets prevent contaminant intrusion into the control module.
* The replacement control module must be programmed.

Note: Record the current Engine Oil Life percentage, and use a scan tool to update the NEW ECM, if replacing.

Removal Procedure




1. Record the current Engine Oil Life percentage, and use a scan tool to update the NEW ECM, if replacing.
2. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection Battery Negative Cable Disconnection and Connection.
3. Disengage the engine wiring harness upper electrical connector retainer (2) and remove the connector (1) from the ECM.
4. Disengage the engine wiring harness lower electrical connector retainer (3) and remove the connector (4) from the ECM.




5. Disengage the retainer tabs securing the ECM to the bracket.
6. Remove the ECM.

Installation Procedure




1. Install the bottom ECM tabs into the bracket.
2. Push the ECM in securing the ECM to the bracket.




3. Position the engine wiring harness lower electrical connector and engage the retainer (3) securing the lower connector (4) to the ECM.
4. Position the engine wiring harness upper electrical connector and engage the retainer (2) securing the upper connector (1) to the ECM.
5. Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection Battery Negative Cable Disconnection and Connection.
6. If a NEW ECM was installed, program the ECM. Refer to Control Module References Control Module References.

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.