Solstice 2006-2008, Sky 2007-2008

Electronic Control Module

Print

Operation



The Electronic Control Module (ECM) is in the engine compartment. The ECM is the control center of the engine controls system. The ECM controls the following components:



The fuel injection system
 
The ignition system
 
The emission control systems
 
The on-board diagnostics
 
The A/C and fan systems
 
The Throttle Actuation Control (TAC) system
 

The ECM constantly monitors the information from various sensors and other inputs, and controls the systems that affect the vehicle performance and the emissions. The ECM also performs diagnostic tests on various parts of the system. The ECM can recognize operational problems and alert the driver via the MIL. When the ECM detects a malfunction, the ECM stores a DTC. The condition area is identified by the particular DTC that is set. This aids the technician in making repairs.

The engine control module (ECM) can supply 5 volts or 12 volts to the various sensors or switches. This is done through pull-up resistors to the regulated power supplies within the ECM. In some cases, even an ordinary shop voltmeter will not give an accurate reading because the resistance is too low. Therefore, a DMM with at least 10 megaohms input impedance is required in order to ensure accurate voltage readings.

The ECM controls the output circuits by controlling the ground or the power feed circuit through the transistors or a device called an output driver module.

Removal & Installation




WARNING
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) Electronic 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.


WARNING
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


NOTE
The replacement control module must be programmed.

  1. Using a scan tool, retrieve the percentage of remaining engine oil. Record the remaining engine oil life.
  2.  
  3. Record the preset radio stations.
  4.  
  5. Turn the ignition OFF.
  6.  
  7. Disconnect the negative battery cable.
  8.  
  9. Remove the left front fender.
  10.  
  11. Remove the windshield washer solvent container.
  12.  
  13. Release the Engine Control Module (ECM) bracket upper and lower retaining tabs using a small screwdriver or other suitable tool.
  14.  
  15. Remove the ECM from the bracket by lifting upward after releasing the tabs.
  16.  
  17. Disconnect the engine wiring harness electrical connectors from the ECM.
  18.  

To install:

  1. Connect the engine wiring harness electrical connectors to the ECM.
  2.  
  3. Slide the ECM into the bracket.
  4.  
  5. Push down on the ECM until the upper and lower retaining tabs snap into place.
  6.  
  7. Connect the negative battery cable.
  8.  
  9. Install the windshield washer solvent container.
  10.  
  11. Install the left front fender.
  12.  
  13. Reset the clock and preset radio stations.
  14.  
  15. If a new ECM was installed, the ECM must be programmed.
  16.  

Testing





Click image to see an enlarged view

Fig. 2.4L (LE5) Engine Control Module (ECM) C1



Click image to see an enlarged view

Fig. 2.4L (LE5) Engine Control Module (ECM) C2



Click image to see an enlarged view

Fig. 2.4L (LE5) Engine Control Module (ECM) C3



Click image to see an enlarged view

Fig. 2.0L (LNF) Engine Control Module (ECM) C1



Click image to see an enlarged view

Fig. 2.0L (LNF) Engine Control Module (ECM) C2

  1. Test the voltage and ground circuits to the control module for the following:

    A short
     
    High resistance
     
    An open
     

  2.  
  3. If all circuits test normal, suspect the ECM.
    NOTE
    The replacement control module must be programmed.

  4.  

 
label.common.footer.alt.autozoneLogo