Engine Control Module Replacement

Courtesy of GENERAL MOTORS COMPANY

Callout	Component Name
Preliminary Procedure Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection (L96 LC8)Battery Negative Cable Disconnection and Connection (L83)Battery Negative Cable Disconnection and Connection (Dual Battery)Battery Negative Cable Disconnection and Connection (L5P) .
1	Electronic Control Module WARNING: Refer to Safety Glasses Warning . 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. Procedure Disconnect the electrical connectors. Release the retaining tabs. If replacing, program the ECM. Refer to Control Module References . NOTE: Before removing the engine control module (ECM), record the Engine Oil Life percentage remaining. Use the scan tool to reset the Engine Oil Life remaining back to the original percentage recorded.

Callout

Component Name

Preliminary Procedure
Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection (L96 LC8)Battery Negative Cable Disconnection and Connection (L83)Battery Negative Cable Disconnection and Connection (Dual Battery)Battery Negative Cable Disconnection and Connection (L5P) .

Electronic Control Module

WARNING:

Refer to Safety Glasses Warning .

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.

Procedure

Disconnect the electrical connectors.
Release the retaining tabs.
If replacing, program the ECM. Refer to Control Module References .

NOTE:

Before removing the engine control module (ECM), record the Engine Oil Life percentage remaining. Use the scan tool to reset the Engine Oil Life remaining back to the original percentage recorded.