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Home >> Saab >> 2009 >> 9-7X 4.2i >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 4.2L - Introduction >> Repair Instructions >> Engine Control Module Replacement >> Removal Procedure
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Removal Procedure

Service of the engine control module (ECM) should normally consist of either replacement of the ECM or programming of the electrically erasable programmable read only memory (EEPROM). If the diagnostic procedures call for the ECM to be replaced, the ECM should be inspected first to see if the correct part is being used. If the correct part is being used, remove the faulty ECM and install the new service ECM. The replacement ECM must be programmed.

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: It is necessary to record the remaining engine oil life. If the replacement module is not programed with the remaining engine oil life, the engine oil life will default to 100 percent. If the replacement module is not programmed with the remaining engine oil life, the engine oil will need to be changed at 5000 km (3,000 mi) from the last engine oil change.
    Fig 1: Locating Engine Wiring Harness Electrical Connectors
    GM1922190Courtesy of GENERAL MOTORS CORP.
  1. Using a scan tool, retrieve the percentage of remaining engine oil. Record the remaining engine oil life.
  2. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection .
  3. Disconnect the engine wiring harness electrical connectors (1) from the ECM.
    4. Fig 2: View Of ECM Bracket Assembly, Nuts & Bolts
    GM1922570Courtesy of GENERAL MOTORS CORP.
  4. If removing the ECM and bracket assembly in order to access other components perform the following steps, otherwise proceed to step 5.
    1. Remove the ECM bracket nuts (1) and bolts (2).
    2. Remove the ECM and bracket assembly (3) from the studs on the intake manifold.
    5. Fig 3: View Of ECM Bracket Retainers
    GM1922191Courtesy of GENERAL MOTORS CORP.
  5. Disengage the retainers (1) securing the ECM to the bracket.
    6. Fig 4: View Of ECM Removed From Bracket
    GM1922192Courtesy of GENERAL MOTORS CORP.
  6. Remove the ECM (1) from the bracket.
    7. Fig 5: View Of ECM Bracket, Bolts & Nuts
    GM1922197Courtesy of GENERAL MOTORS CORP.
  7. If the ECM bracket requires removal, perform the following steps:
    1. Remove the ECM bracket bolts (2) and nuts (1).
    2. Remove the ECM bracket (3) from the studs on the intake manifold.
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