GM 12209624
PCM

Start the Engine Control Module programming process with an acquisition of the vehicle's VIN number. Through the Techline terminal users should first select Service Programming followed by Tech 2 before selecting Reprogram ECU and Off-Board Programming Adapter as the ECU location. Append the control module and Off-Board Programming Adapter to the Tech 2 while using the appropriate connector from the Off-Board Programming Adapter kit. The Service Programming Request Information function on the Tech 2 opens communication with the control module to obtain the access code before exiting this function and uninstalling the Off-Board Programming Adapter. The next step involves connecting the Tech 2 to the Techline terminal while ensuring the device is powered on and entering the specific VIN of the vehicle. Look for the database connection message on the Techline terminal before identifying the required programming type and selecting an appropriate calibration file for all secure connections. You will see a summary screen through the terminal interface which you must confirm before the terminal loads all calibration files to the Tech 2. Complete the download process by turning Off the Tech 2 followed by disconnecting the terminal from the Techline connection then reattaching it to the Off-Board Programming Adapter before starting the Service Programming selection. The Off-Board Programming Adapter requires users to keep it ON during any unsuccessful programming attempts while ensuring connection security along with updated Techline software before another attempt at control module reprogramming. Failure to reprogram the control module requires a new replacement of the module. To finish the process select Program on the Tech 2 then leave Service Programming after the download completes before shutting off the Off-Board Programming Adapter.

The procedure for remote Engine Control Module programming starts by turning off ignition and connecting the Tech 2 tool to the data link connector (DLC). Start the ignition system then pause the engine operation while making sure every accessory remains deactivated. Starting with Tech 2 the Service Programming function must be selected followed by entering the required vehicle data. Determine the module type for programming followed by the programming selection then compare the VIN displayed to the actual vehicle VIN while documenting any displayed mismatch to update at Techline. Press the exit button to terminate Service Programming and then disable the Tech 2 followed by disconnecting its cables from the vehicle. Reconnect the Tech 2 to the Techline terminal followed by selecting Service Programming again before confirming the tool is Tech 2. Select the programming type and module for the operation while choosing between Normal for calibration updating or Vehicle configuration index when the VIN is unknown or Reconfigure to update tire specifications. Click the correct calibration file then verify all cables are secure before starting the download procedure with Reprog. The programming download process finishes before you switch OFF the Tech 2 tool and remove it from the Techline interface terminal. After the Tech 2 connection to the DLC, turn ON power and start the ignition with the engine OFF under the Service Programming menu. It is essential to avoid shutting off the ignition when control module programming fails or gets interrupted because all PCM and DLC connections must be checked along with verifying that the Techline software is updated before continuing with control module reprogramming. The control module needs replacement if programming fails to complete successfully. Select Program followed by a software download exit of Service Programming then wait for thirty seconds and disconnect the Tech 2. The replacement of a control module requires execution of the CKP System Variation Learn Procedure followed by GM Oil Life System reset and I/M Set Completion at Maintenance and Lubrication and final programming of Theft Deterrent System Components in Theft Deterrent.

Before Engine Control Module servicing you need to use a scan tool for clearing active fault codes. Start the vehicle engine but if it fails to start or runs poorly attempt to perform the Service Programming operations again. Perform PCM programming when you confirm that all connections including control module and DLC remain secure while operating software stays updated as well as selecting the correct calibration part number (XXXX) for the vehicle. The next step should be an attempt to program the control module. Programming the control module (XXXX) will fail to work so the technician must replace it with a new one while ensuring the programming of the replacement unit.

Users need to begin servicing and repairing the Engine Control Module after clearing DTCs through a scan tool while attempting engine start-up steps. You should perform another Service Programming run after confirming that both the control module links with the DLC interfaces securely and that both Techline operates with current software and uses the appropriate calibration code for this vehicle. The control module programming attempt should follow until where proper programming becomes impossible to warrant a control module replacement (Powertrain Control Module (PCM) Replacement). Ensure program installation for the new control module.

Disconnect the harness connectors from the PCM and remove the PCM from the air cleaner housing assembly.

After programming, the powertrain may operate differently, requiring the control module to re-learn values like fuel trim correction and idle air control position.

Turn OFF the Tech 2, disconnect it from the Techline terminal, and reconnect it to the DLC.

Reconnect the PCM connectors and tighten them to 8 N.m (71 lb in), carefully reinstall the PCM and harness into the PCM housing, then install the upper air cleaner housing assembly and secure it with the two screws, tightening them to 4 N.m (35 lb in).

Remove the intake duct and the two screws from the upper and lower air cleaner assembly sections, followed by the upper air cleaner housing assembly.

Turn OFF the ignition and install the Tech 2 to the data link connector (DLC).

A message indicating it is attaching to the database.

Reconnect the Tech 2 to the Techline terminal, select Service Programming, and choose Tech 2 as the tool in use.

Disconnect the negative battery cable.

Disconnect the negative battery cable.

Exit the Service Programming Request Information function.

Ensure all PCM and DLC connections are secure and the Techline software is current.

Servicing the PCM typically involves either replacing it or programming the EEPROM.

Install the PCM and the harness back into the air cleaner housing, followed by the air cleaner housing cover assembly.