Montana SV6 V6-3.9L (2007)
Engine Control Module: Service and Repair
Engine Control Module Replacement
Service of the engine control module (ECM) (controller) should normally consist of either replacement of the ECM or electrically erasable
programmable read only memory (EEPROM) programming. If the diagnostic procedures call for ECM replacement, inspect the ECM first to see if the
ECM is the correct part. If the ECM is faulty, remove the ECM and install the new service ECM.
Notice:
* 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.
Important: When replacing the production ECM with a service ECM, it is important to transfer the broadcast code and production ECM
number to the service ECM label. Do not record this information on the ECM cover. Transfer allows positive identification of ECM parts
throughout the service life of the vehicle.
The new service ECM will not be programmed. You must program the new ECM. DTC P0602 indicates the ECM is not programmed or has
malfunctioned.
There are no user serviceable parts in this ECM. The ECM should never be opened for any reason.
Important: 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 5 000 km (3,000 mi) from the last engine oil change.
Removal Procedure
1. Using a scan tool, retrieve the percentage of remaining engine oil. Record the remaining engine oil life.
